Installation of a boiler security group in a closed heating system

Ensuring the safety and efficiency of your closed heating system is crucial when installing it in your house. A key element in achieving this is the boiler security group. This assembly is a necessary component of any boiler installation since it controls pressure and guards against system damage. Maintaining a secure and efficient heating system can be made easier for homeowners by being aware of how a boiler security group operates.

Three essential components are usually included in the boiler security group: an air vent, a pressure gauge, and a safety valve. Together, these parts regulate the heating system’s internal pressure, let go of excess pressure when needed, and assist in clearing the system of any trapped air. This helps to maintain the overall performance of the system and shields the boiler and any connected parts from damage caused by pressure.

By installing a boiler security group, you can ensure the longevity and effectiveness of your heating system in addition to equipment protection. In addition to extending the boiler’s lifespan and preventing frequent repairs, proper installation and maintenance of this group can give you peace of mind that your heating system is operating safely. The first step to a more secure and effective heating system for homeowners is learning how the boiler security group is set up and operates.

Component Function
Pressure Relief Valve Releases excess pressure to prevent system damage.
Pressure Gauge Monitors the pressure level within the system.
Air Vent Removes air trapped in the system to ensure efficient operation.
Isolation Valve Allows for maintenance without draining the entire system.

Conditions for the equipment of the boiler room

  • Conditions for the equipment of the boiler room and devices for the heating system
  • Approximate heating scheme

The tendency to constant rise in the cost of familiar types of fuel and some conditions under which there is no way to use traditional types of energy (natural gas, electricity) leads to the search for alternative fuel types for buildings heating systems. Installation in a private house or on production areas of heating systems based on a solid fuel boiler solves many problems. For example, with the high cost of delivery or the impossibility of conducting natural gas or profiling woodworking production, solid fuel is a priority for heating the premises. Quite often for heating private houses, cottages and cottages, heating systems based on a solid fuel boiler are used. This type of heating has an advantage in enterprises in hard -to -reach areas where there is no gas pipeline, as well as in industries associated with wood processing, the waste of which can be used as fuel.

For heating private homes and businesses without access to gas, solid fuel boilers are utilized.

Wood, including firewood, wood chips and waste, peat braces, coal, and coal dust are all examples of solid fuel. With automatic fuel burning control in the tank, modern solid fuel boilers achieve an efficiency of roughly 80%. Under these circumstances, the burning of high-quality coal can take up to 20 hours and wooden fuel up to 12 hours.

Solid fuel boilers were designed with the goal of producing as much heat as possible. The boiler’s double walls, which the air travels along before entering the combustion chamber, the water sleeve, which absorbs heat from the system along its whole length, and the superior thermal insulation surrounding the boiler all contribute to energy efficiency.

The purpose of the security group

Everything ought to be secure. The heating system is no exception. Any type of boiler, whether it runs on solid fuel, gas, or electricity, poses a risk to the home’s occupants. The truth is that the system’s pressure fluctuates constantly while work is being done. This process is linked to both increases and decreases in temperature. This could potentially result in an explosion as well as pipe fractures. Consequently, the heating system’s security group needs to be present.

The security group’s main purpose is to safeguard the system against pipe breaks, leaks in shut-off valves, and other component failures. She is in charge of the pressure drops, which will cause a "descent" if they reach their peak. How does something like this occur? It all comes down to the components that make up this kind of group:

  1. Safety valve. This part is responsible for the control of high pressure. This device is designed for certain indicators, upon reaching which, it works and eliminates all unnecessary loads. If there is an expansion tank in heating, then it is also obliged to perform this function – as soon as the liquid heats up, then its excess enters this container. Thus, constancy in pressure is achieved. At the same time, the total heat carrier is not changing. But, as practice shows, the expansion tank may not work. It is then that the emergency valve comes to the rescue. BUT! During installation, it is important not to forget, attach the hose to the thread, otherwise all the excess water will be on the floor. It is also brought to the sewage. But such a discharge is intended only for water, since antifreeze, in no case, can not be drained into the sewer system. The valve from above has a handle, which is turned in the required direction (there is an arrow-appointer) and wait until all the excess water comes out. When the liquid is not held in the valve, this indicates a breakdown. There are two options for solving the problem – replacing an element or a more dense dive in the saddle. But in order to correctly solve this issue, perhaps, you can’t do without the help of professionals.

  1. Automatic air vent. This element needs to install a security group at the top point. This is due to the fact that the air always strives upward in other substances. Accordingly, any air bubble will go up the pipes, where they will “catch” the air vent. In a sense, this detail is very reminiscent of the crane of Maevsky, only here all the work happens automatically. If an emergency situation arises in the system in the system, then the air vent will take on the main air strike. For example, when the thermostat fails, then the coolant can occur in the system, which means that air may occur in the pipes. In this case, this element will absorb it, so that the system will remain intact and safety.

  1. Manometer. This device is responsible for adjusting the pressure in the highway. On the case, the manufacturer always indicates the range of working pressure. For an average house, devices in 2-3 atmospheres are suitable. For the purpose of insurance, experts recommend taking 1 unit more. That is, if the boiler is in 2 atmospheres, then the pressure gauge must be bought at 3. The device has a black and red arrow. The first will show normal pressure, and red emergency. That is, if on the manometer suddenly the pointer reaches the red designation and passes for it, then it means that in the system of heating system. It is the red arrow that is installed in manual. To determine its “peak”, you should look into the technical passport of heating equipment. But usually, more than 2 atmospheres are not installed (if the boiler is flooring).

Hot adhesion is used to secure all three of these components to the consoles.

Purchasing a security group has subtle differences of its own. First of all, a specific working pressure is intended for each safety valve. Typically, there are three atmospheres. Second, the manometer has its maximum work indicators; the same holds true for it. Thus, it is advisable to review the heat generator’s technical documentation before heading to the store to select the best safety set for it.

How to run the coolant into the system

Traffic jams caused by aircraft should not occur when filling a closed circuit.

If a crane is used to connect the heating circuit to the water supply, you will need to periodically open the valve and let the air that has been displaced from the radiators in order to fill it up.

This process keeps going until all of the extra air escapes and the pressure reaches the needed, calculated amount.

A pump and a capacity are needed to fill the contour that isn’t connected to the water supply so that the coolant can be pumped out of it. Make sure all the radiator taps are open before serving. After attaching the drain fitting to the pipe, the building is filled with the help of the circulation pump.

Crucial! To avoid leaks, the coolant must be closed just in time when filling the heating circuit.

Choosing a suitable security group

The following factors should be taken into consideration when selecting a protective group:

  • The indicator of the maximum power of the boiler for which the protective device is designed.
  • Pressure in which the system will function. Depending on the manufacturer, the figure can vary from 4 to 10 bar.
  • Permissible water temperature circulating in the pipeline. Models presented on the market allow you to pass a flow not higher than 120 ° C.
  • Compatibility with various coolants: steam, water or antifreeze flows.
  • To study the principle and thread of the connection, so as not to look for additional adapters and seals.

You must accurately calculate the power of the home boiler before purchasing the device to enable the security group to operate more effectively. Calculation formula:

The area of the house is S.

U is the climate (the indicator varies according to the country’s region):

  • South – 0.9 kW
  • Moscow and the region – 1.5 kW
  • Middle strip – 1.2 kW
  • North – 2 kW

We add 50–55% of the resultant work to the boiler power if the room is not insulated. Because of this, the device typically costs between 1,500 and 1700 rubles in Russia.

The main varieties of security heating groups

As was already mentioned, security block configuration might be the most varied. For instance, there is one such choice.

Alternatively, consider this alternative where every component is contained within a single case.

A couple more choices.

There are numerous alternatives for putting the security group on sale, but since all of them operate on the same principle, external indicators have no bearing in this situation. Again, you should select a specific model based on the pressure indicator that the protruding valve and pressure gauge are made from.

After discussing the primary categories, we will now familiarize ourselves with well-known producers and the approximate price ranges of their products.

Settings and launch

Following the initiation of the structure’s coolant Examine every connection on the circuit. Prior to that, the air from the pump must be downloaded; otherwise, the device’s operation may be compromised. The next step is to open a small Cranes of Maevsky and repeat the process around all the batteries.

The air drops until the radiators are releasing water. Subsequently, the pressure reading on the gauge is verified. The liquid is rejected once more and the equipment process is restarted if she falls below 1.5 atmosphere.

The system is then being tested. The coolant is rolled into the pipes by the pump until the pressure rises 1.5–2 times.

This is how the heating structure is left. The pressure is then measured once more after 15 minutes. There was a leak somewhere if the measuring device’s indicators changed.

In the event that the coolant level is too low, the system restores the working pressure.

The last phase is to turn on the heat generator, which is already connected to the network and ready for use. The equipment’s thermostat is set to a modest temperature (40–50 °C), and a period of time is allowed for the coolant’s entire volume to warm up. All of the radiators are checked after that. if the battery’s upper regions are cold.

Next, raise the fluid’s temperature to between 70 and 80 °C, and then turn off the heating circuit for a while. The system operates normally and doesn’t need any extra settings if thermal devices continue to operate normally and the liquid in the reverse pipe is 20 °C cold-heated.

Design elements of the device

Usually, the heating boiler’s safety group’s devices are purchased as a kit. As a result, the manufacturer made sure that every device was configured for the best possible operating mode.

Supporting valve

The expansion tank, which is positioned above all pipes and heating components, makes up for the coolant’s expansion during regular heating system operation. The heat generator’s output temperature is calibrated based on the selected mode of operation. The expansion tank’s liquid content varies.

This unit’s performance is generally not a source of complaint. The passage section gradually shrinks and eventually vanishes during extended operation, occasionally clogging the pipe with a crocheted. Since this malfunction cannot be visually identified, users rarely notice it. The leak that leads to the expansion tank conceals the defect that has developed. One or more heating system components will be destroyed due to an increase in pressure and the heating boiler’s lack of a security group.

In this case, the heating system’s safety valve

The safety valve will release the excess coolant if the security group is installed. The pipelines and boiler will not break. The presence of a water discharge will be visible to the user. Either the user or the service will independently identify the issue and remove its root cause.

We must evaluate the safety valve’s functionality prior to each heating season. It will take some time to get her.

  1. There is a handle on the upper part, it needs to be turned in the direction of the arrow.
  2. Water will flow.
  3. Turn in the opposite direction.
  4. The water should stop flowing – the safety valve is working.
  5. Another option: water continues to flow.
  6. In this case, you need to repeat the opening of the opening several times in a row.
  7. Practice shows that these actions are enough to wipe the valve a little in the nest.
  8. The leak stops.
  9. If the water continues to drain, then you need to urgently replace the safety valve.

Safety valves for pressures up to three bars are used in private residences.


The heating system’s operation is managed by the manometer. The pressure gauge has two arrows on it:

  • The black arrow shows actual pressure – this is a working arrow;
  • Red is installed when setting up the system before starting the heating boiler, it serves as a guideline in operation.

Gauges for axial and radial pressure

The working pressure in individual homes is two to three bars. However, the manometer itself ought to be built to withstand at least 4 bar of pressure.

Automatic air vent

Since the air is also at the top, it is advisable to install an automatic air vent above the entire heating system. Some users think that installing the Maevsky crane on heating devices is sufficient, and that the air that is already inside pipelines and heating systems should be released when they are filled. so that the majority of the air present can be removed. Experimentation has demonstrated that during work, residual air is moved through pipes and batteries, which lowers productivity.

Corner air vent that operates automatically

Will remove steam bubbles and air when in automatic mode. Many people frequently watch this device in action during the boiler’s autumn launch. A slight hissing sound coming from the security group’s heating side is what distinguishes it.

Stages of independent installation

It is possible to assemble the heating system security group on its own. You’ll need a lot of time and money for this. As long as everything is done correctly, the unit should function flawlessly and shield the equipment from emergencies and malfunctions.

Connection rules

Examine the professional advice carefully before moving forward with the security unit’s independent installation. They will assist novices in avoiding numerous errors and creating a structure that is genuinely dependable.

Generally speaking, connection advice:

  1. It is best to install a protective unit on the supply pipeline located at the output from the device.
  2. You can place the block at a distance of at least 50 centimeters from the heat source.
  3. There should not be any extraneous details (tees with a branch, cranes) on the pipe piece of the pipeline where the protective device is mounted.
  4. Professionals do not recommend installing a security group on metal -plastic or polypropylene pipes, as they can be deformed under the influence of heated air. The best option would be to use a metal segment.
  5. Automatic air vent is fixed only in an upright position.
  6. A flexible hose can be connected to the safety valve, through which excess fluid can flow into a bottle or on the floor.

Choosing and buying components

Since pre-made security blocks can be costly, it is preferable to buy the individual parts. This small tip will assist in cutting costs twice.

When selecting specifics It is advisable to heed the following advice:

  1. Do not buy the cheapest safety valves that were produced in China. Such products will quickly fail and will not discard pressure.
  2. All manometers of Asian origin give out incorrect indicators. This is due to the low quality of materials and the wrong graduation.
  3. It is better not to use an angular air vent, as it creates additional resistance to the outgoing pair.
  4. Choosing a safety valve should be based on the working pressure of the installed boiler. Such information can be found in a technical passport that is attached to the device.
  5. It is better to choose a cross from a high -quality brass.

Various tools and materials will be required for the task. You can either buy them from any building supply store or rent them from friends.

Among the things, there has to be:

  • Divorous wrench;
  • gas keys;
  • union;
  • Cross;
  • adapters;
  • Chargers with external and internal threads;
  • any material for sealing compounds (plumbing lines, special tapes and others);
  • sealant.

Operating procedure

After the completion of all the necessary preparations, you can begin assembling the security unit. This task is completed in a few easy steps:

  1. Plumbing linen is neatly wound on carvings carvings. At the same time, it is important to lay the material evenly, without gaps.
  2. For better fixation of the connection, a thin layer of sealant is applied.
  3. Chargers are attached to the cross with the help of a wrench.
  4. Then a manometer, a maevsky crane and a safety valve are mounted. If they have different diameters, then use suitable adapters.
  5. All joints are carefully treated with sealant.
  6. The protective unit is tested for performance. During the audit, the detected leaks and other defects are eliminated.

The components of the security unit

You must take into account the security group’s design in order to comprehend the fundamentals of how the safeguard functions. It’s a system made up of multiple components. Every single key link carries out a distinct function.

The modules that comprise the heating safety system are as follows:

  1. Corps made of galvanized steel.
  2. Automatic air vent. It is also called the crane of Maevsky. Designed to remove excess air from the system. As a rule, brass is used for production.
  3. Safety valve. Need to duplicate the air vent. If the automatic executioner does not discard the air, the valve performs this work for it. He also removes excess water. For the production of the safety valve, brass alloy is used.
  4. Manometer and thermometer. The thermometer shows the temperature level, and the heating manometer shows information regarding the pressure in the heat supply system. The optimal pressure is considered optimal, which is suitable for the operation parameters of the heating boiler. As a rule, this indicator is 1.5 atmospheres. It should be noted that today there are also thermomanometers for heating, which are a device that measures both the temperature and the pressure in gaseous and liquid media.

Pressure gauges and thermometers are among the control and protection components that are fastened to the metal case’s upper section. The protective mechanism’s components are not installed separately. Since the complex as a whole cannot function properly in the absence of one of them. For instance, heating systems have thermometers and pressure gauges, but no safety valve. In this scenario, the user will notice an increase in pressure but will be unable to resolve the issue.

For instance, let’s say there is an air vent but no safety valve. In this instance, the body will retain the overheated liquid while the extra air escapes. which may cause the heating system as a whole to fail. A heating controller and hydraulic engine are intended to regulate the heat supply system, ensuring that the ideal temperature in the apartment is maintained regardless of the degree of outside temperature fluctuations.

A few nuances

In certain cases, a single group cannot be selected based on the heat generator’s technical specifications. In this instance, you have the option to purchase each component individually and right away in order to assemble the entire set. It is advisable to seek professional assistance if self-confidence is lacking. After all, a safe heating system depends on a properly installed component.

Sometimes the system is in a certain state for whatever reason. The security group is dormant, correspondingly. Therefore, a lot of elements can be contaminated right now. As a result, the valve needs to be cleaned and opened in the direction indicated by the arrow before performing a full start.

As previously stated, even in the case of an expansion tank, the safety valve needs to be attached to the drain hose. Thus, apart from being accurately combined and poured into the sewer (or, in the case of antifreeze, placed in a sturdy container), its diameter also needs to match the volume of the product. The extra coolant will be allowed to exit the heating system freely under these circumstances.

The security group for heating closed type is convenient in that it is one continuous structure. True, this is subject to the finished set. The connecting coupling is located from below, through which the security group is fixed in the heating system. To do this, the device is fixed on the existing fitting, which leaves the boiler or crashes into a feeding pipeline. For such work, no specific tools are needed, there will be enough a standard set of a plumbing. But if the installation work is carried out with their own hands, then it is worth remembering: the segment of the pipe that will connect the boiler and the security group should always remain “clean”, that is, it is forbidden to mount any armature there. Experts recommend installing a set almost close to the heat generator.

There is one more installation-related detail. Selecting a location for a group installation on a feeding line requires that indicators be seen straight from the room’s entrance. For what purpose is it used? There could be various emergency scenarios. Therefore, there is a chance to identify distant pressure issues within the system and, if required, remotely turn it off.

The connections on the device are threaded. As a result, leaks are likely to occur. For this reason, it is advised to use a FUM tone in these situations. Paste, linen, or other materials with comparable qualities can be used as a substitute. Such processing is the only way to help these points sustain a high load while also producing a hermetic compound.

It’s important to keep in mind that water and electricity do not mix, so electric boilers need extra care. Controlling this issue is necessary because the security group is frequently installed above the unit. The allocation hose with the accumulative container is necessary in this situation!

In actuality, selecting and acquiring a security group is not particularly difficult. Making sure they are installed correctly is crucial. If not, they will not make sense and the heating system’s safety will continue to be questioned.

Installation rules

The most costly and vulnerable component of the heating system is the boiler equipment. Consider this: the majority of units are made to function at a maximum pressure of 3 bars, whereas the maximum pressure that plastic pipes and cast-iron radiators can withstand is 10 bars and 7 bars, respectively. This is the primary justification for the safety device’s placement on the supply pipeline next to the heater, which shields it from damage in the event of an emergency pressure surplus.

As a point of reference. Solid fuel heat generators come in low-cost models composed of thin metal. The valve in the system should operate at 1.5–2 bar to prevent their walls from bursting at the seams.

An expansion tank, a circulation pump, and a locking reinforcement are not visible in the circuit.

The water in the boiler’s shirt is at its highest temperature because it generates heat. In the first instance, pairs with emergency overheating form here. As indicated above in the connection diagram, both exhaust valves need to be positioned close to the heat generator in order to swiftly redirect the expanding steam-water mixture out of the way.

Here are some guidelines for properly installing and attaching a security group to the boiler:

  1. Installation site – supplying pipeline at the output of the heating unit.
  2. The maximum distance from the heat source to the safety device is 50 cm.
  3. On the pipe section connecting the heat generator with the element, it is not allowed to install cranes or tees with a branch to the membrane expansion tank. There should not be anything on this section of the highway.
  4. The specified section of the pipeline is made of metal. Polypropylene, metal -plastics and stitched polyethylene from exposure to steam can be deformed.
  5. Airier position – strictly vertical.
  6. Connect a flexible hose to the safety valve, whose end is directed to a transparent plastic bottle or right on the floor.

The only situation in which the installation of the crane in front of the GB is appropriate is when you purchase a low-quality, inexpensive product and the valves malfunction, flow, etc. Remove the handle from the rod, or butterfly, and temporarily install the valve so as not to empty all pipelines containing radiators before replacing them.

Suggestions. A solid fuel boiler’s valve pipe should never be lowered into the sewer. There won’t be any traces if the fuse functions normally while you’re away. Spots on the floor or water in a bottle that signal an emergency (overheating) are other things to consider.

The installation of a series of valves with a manometer on boiler-burners that burn coal and firewood frequently requires a special fitting, which will be covered in the product documentation. It is unnecessary to search for a different installation site in a similar circumstance. Watch the video for additional details regarding the installation of the security unit:

Closed heating system, what is it, the principle of operation, pros and cons of

These plans make use of membrane tanks for expansion. a sealed capacity split by an elastic membrane into two sections.

The valve opens as the temperature rises, transferring the extra fluid to the tank.

The coolant returns to the system as the temperature drops, ensuring steady pressure within it.

Because an ignoring tank has the capacity to fill up to the brim with liquid, installation and maintenance of pressure should be done in a more compact manner than with a conventional tank. It enables you to automatically drive the design and modify the circuit’s specified parameters.

The components of a closed outline include the following:

  • from a sealed membrane tank;
  • from batteries (radiators);
  • from the heating boiler;
  • from the circulation pump;
  • from pipes;
  • From connecting elements (valves, cranes, filters).

A closed heating system offers the following benefits:

  1. the ability to use any coolant;
  2. durability of the structure due to complete tightness;
  3. lack of excess noise;
  4. the possibility of independent installation of the system;
  5. high speed of fluid movement, providing maximum heat transfer;
  6. lack of the need for thermal insulation for the highway;
  7. Reducing financial costs for heating the house.

The drawbacks include reliance on electric power and the requirement to purchase an expensive, large-sized membrane tank. Installing small generators that can provide emergency power or continuous power supplies solves the issue of energy dependence.

Design schemes, use in apartment buildings

Single- or double-pipe heating circuits are used in private residences.

One-pipe schemes are utilized in small-space rooms where a maximum of five radiators are needed for heating.

Diagram of a single-pipe, closed heating system (photo 1). The radiators are linked in order of sequential connection.

Since the batteries are added to the circuit one after the other, the final heating device will always be colder than the initial one. One clear benefit of this kind of arrangement is that it uses less pipes.

The other batteries will function normally even if one fails. When utilizing Bypas. Both vertical and horizontal one-pipe systems are possible. Since the horizontal makes it impossible to change the coolant’s value, bypasses are added when laying it. In high-rise buildings, the vertical one-to-the-trial circuit is typically utilized.

The rooms are more evenly heard in a two-pipe (double-circuit) scheme. A fluid circulates on two contours from the heat generator to the batteries. Here, the radiators are wired in parallel. Every battery’s coolant is the same temperature. The cost of this method is significantly higher, but it allows temperature control in every room.


Perform a hydraulic calculation of the heating scheme to determine the proper diameter of pipes and circulation pump. It enables you to maximize operating expenses and pinpoint hydraulic pressure losses in particular regions.

Take note! Installing a circulation pump in the reverse pipe is advised. In this instance, the device’s lifespan will be extended because the coolant that has already cooled will pass through it.

After choosing the batteries, a specialist performs calculations using heat engineering calculations. The computations will yield the pressure value needed to propel a circulation pump that moves water. Following this phase, a calculation is made to determine the volume and choose a membrane tank.

The principle of valve operation

Coolant expands when the heating system in the pipelines overheats. Excess liquid can enter the expansion tank in open systems, but in closed schemes, she has nowhere to go. Pumping the pressure gradually allows it to reach a critical value eventually. It is likely the result of either a boiler failure or a loose connection if it is not brought down to a manageable level.

The safety valve is designed to allow for the release of excess fluid through its mechanism. Never assume that the system loses a lot of water when it is activated. If the volume of liquid decreases by 200 grams during medium volume heating (roughly 150 liters), two pressure bars will be lost (subject to the coolant’s approximately 100 degree Celsius temperature). Most of the time, losing no more than 100 grams of water is required to return the situation to normal.

Therefore, a reasonably priced gadget will shield other heating system components and boiler equipment from malfunctioning. Furthermore, he will eliminate the need for capital repairs, which will undoubtedly become necessary following the heat line’s failure. It will therefore make more sense to buy and install a security group for autonomous heating in closed systems.

Expande tank for a closed heating system

The expansion tank is used to account for variations in coolant volume caused by temperature variations. This is a sealed container that is split into two sections by an elastic membrane in closed heating systems. Air or inert gas (in more expensive models) fills the upper section. The tank stays empty, the membrane is straightened, and the coolant temperature is low (see the image on the right).

The membrane expansion tank’s operating principle

The coolant expands in volume when heated, and any excess rises into the tank where it pushes the membrane aside and squeezes the gas uploaded to the upper portion (left picture). This is shown as an increase in pressure on the pressure gauge, which can be used as a warning to lessen the intensity of combustion. Some models have a safety valve that releases extra air or gas when the pressure reaches a certain threshold.

The manometer indicators return to normal as the coolant cools down and the pressure in the upper portion of the tank squeezes out the coolant from the container into the system. That is the membrane type expansion tank’s entire working principle. It should be noted that there are two different kinds of membranes: plate and pear-shaped. Regarding the principle of operation, the membrane’s form is irrelevant.

Types of expansion tanks membranes used in closed systems

Calculation of volume

Generally speaking, the expansion tank’s volume should make up 10% of the coolant’s total volume. This means that you need to figure out how much water can fit in your system’s pipes and radiators (this can be done by counting the volume of the pipes or by consulting the radiators’ technical data). The required expansion tank volume will be represented by a fraction of 1/10 of this amount. However, this figure only applies if water is used as the coolant. The tank size increases by 50% of the calculated volume if non-freezing fluid is used.

This is an illustration of how to figure out a membrane tank’s volume for a closed heating system:

  • the volume of the heating system is 28 liters;
  • the size of the expansion tank for a system filled with water of 2.8 liters;
  • The size of the membrane tank for a system with non -freezing liquid is 2.8 + 0.5*2.8 = 4.2 liters.

Choose the nearest larger volume when making a purchase. Don’t take less; a small stock is preferable.

What to pay attention to when buying

Stores carry blue and red tanks. You can use red tanks for heating. Although they are made for cold water and cannot withstand high temperatures, blue is structurally identical.

What else should I focus on? There are two kinds of tanks: those with an irreplaceable membrane and those with a replaceable membrane (called a flange). The second option is significantly less expensive, but you will have to buy everything new if the membrane gets damaged.

In models with flanges, only a membrane is purchased.

Place for installing an expansion tank of a membrane type

If you look in the direction of the coolant, you should typically place an expansion tank on the reverse pipeline in front of the circulation pump. The pipeline has a tee installed in it, a small section of pipe connected to one end, and the expander connected to the end through the fittings. In order to prevent pressure drops, it is preferable to position it a specific distance away from the pump. A crucial point: a membrane tank’s strapping should be simple in some areas.

The expansion tank installation plan for the heating membrane type

Following the tee, a ball crane was installed. It is imperative that the tank can be removed without the need for drainage. The ability to connect with an American (a rug nut) is more convenient in and of itself. This makes installation and disassembly easier once more.

Please be aware that expansion tanks are present in certain boilers. It is not necessary to install the second one if its volume is sufficient.

The water-filled device has a solid mass, but the empty device weighs less. As a result, extra supports or a way to fasten to the wall must be provided.

The expansion heating tank can be installed on the floor by hanging it from the bracket to create a tank supporting platform with legs.

Connection to the heating system

Prior to anything else, the security group’s installation location must be accurately identified. There are specific guidelines that need to be followed:

  • This should be a horizontal section of the pipeline next to the heat generator;
  • on the feed line after the boiler;
  • Some boilers provide for the installation of a security unit directly on the unit itself, for this there is a special connector on top of the heat generator;
  • The distance from the heating device to the protective unit should not exceed 1.5 meters, less can;
  • For a pipe that goes vertically up from the boiler, for example, to the next floor, it is necessary to equip a branch. This is done using the corner so that the security group can be located in a horizontal plane and the units are watched by the “heads up”;
  • For a very powerful boiler, you may need to arrange another protective unit.

One crucial guideline that must be followed is that the locking reinforcement that should be installed between the boiler and security group is not installed. Installing a protective block at the first locking crane on the line will be advised.

It is essential to connect a drainage tube to the device and bring it to the sewer in order to prevent injuries during inspection or when the safety valve is activated while people are around.

It is important to promptly check the safety valve’s functionality. The process is carried out as follows: after installation, open the cap in the direction that the device’s arrow points.

Checking that each module is operating correctly is necessary following the installation of a protective device. You must unscrew the upper cap and lower the air in order to begin using the air vent. Now that the lid is back in place, the gadget should continue to be open.

We collect a security group with our own hands

Prior to assembling a security group by hand, you must buy the required parts and get your supplies and equipment ready. Thus, in order to work, we’ll need:

Picture 4: Tools and parts for building a security group yourself

  • safety valve;
  • manometer;
  • air vent;
  • two corners with internal and external threads;
  • Cross;
  • nipple;
  • adapters;
  • two gas keys;
  • linen;
  • The sealing tool.

The angles are attached to the cross to start the security group assembly. This is accomplished by winding tiny flax strands clockwise on a threaded connection to cover the thread’s surface uniformly. The flax is then covered in a thin layer of sealant, and the corners are screwed into the cross-faced pieces that are wound up against each other. The same technology is then used to install a safety valve, air vent, and pressure gauge. Adapters are used to join parts with different diameters.

Once a security group has been assembled, it needs to be pressure-tested to ensure that there are no leaks and that each component is operating as intended. A home-made block is roughly twice as expensive overall as its factory equivalent.

Watch the video below to observe the autonomous creation of a security group:

Go back to the contents table.

Which boiler to choose

Installing an automated heating boiler makes sense because a private home’s closed heating system can function independently. You don’t need to go back to this in this instance because you’ve already set the parameters. There is no human intervention in any regime.

The easiest gas boilers to use in this context. They can be connected to a thermostat in a room. It maintains the temperature set on it to within one degree of accuracy. The house began to warm as the boiler came on and she dropped a degree. The work stops as soon as the thermostat operates (the desired temperature is reached). economical and incredibly comfortable.

Certain models allow for the connection of weather-dependent automation, which uses external sensors. The boiler modifies the burners’ power based on their indications. Gas boilers are a good piece of equipment that can be comfortable in closed systems heating. The lack of gas everywhere is merely unfortunate.

The house’s two floors have a two-pipe closed heating system (scheme)

Automation is the best that can be applied to electric boilers. Not too long ago, induction and electrode were added to the conventional units on the heating elements. Their low inertia and compact dimensions are different. A lot of people think that they use the heating elements more economically than boilers. However, not all places can use these video units because power outages during the winter are common in many parts of the nation. and supply the boiler with electricity. 8–12 kW from the generator—this is a very challenging situation.

Solid or liquid fuel boilers are, in this sense, more independent and universal. An important note: installing a liquid fuel boiler necessitates a separate room; this is a fire service requirement. Although solid fuel boilers can be placed inside the home, doing so is inconvenient because the fuel causes a lot of trash to fall into the firebox.

Contemporary solid fuel boilers still function as periodic action devices (heating via a firebox and cooling down when the laying is burned out), but they also feature automation that enables the system to maintain a set temperature and control the intensity of the burning. While it’s not as automated as gas or electric boilers, it’s still quite high.

An illustration of a closed-loop induction heating system

In our camp, pellet boilers are not very common. Though these boilers operate continuously, this kind of fuel is also solid. The furnace receives pellets automatically (until the supply in the bourker is completed). Ash cleaning is necessary once every few weeks with good fuel quality, and automation controls every aspect. The only thing stopping this equipment from spreading is its high cost; most of its manufacturers are in Europe, and their rates are reasonable.

A brief explanation of how to figure out the boiler’s power for closed heating systems. The general rule states that a 10 kV area with typical insulation requires 1 kW of boiler power. Simply take a "back." First off, there are times when it’s unusually cold and you might not have enough calculated power. Second, working at maximum power causes equipment to wear out quickly. Consequently, it is preferable to use a 30–50% margin when calculating the boiler’s power for the system.

Installing a boiler security group in a closed heating system is crucial for maintaining safety, efficiency, and longevity of your heating setup. This unit, typically installed near the boiler, acts as a safeguard by regulating pressure and temperature within the system. It prevents scenarios of overpressure and overheating, which can cause significant damage and even system failure. The security group usually includes safety features such as a pressure relief valve, an air vent, and a pressure gauge, ensuring that any excess pressure or air trapped in the system is safely released. By integrating a boiler security group, homeowners can ensure that their heating system operates smoothly and reliably, avoiding costly repairs and potentially hazardous situations.

How to fill in a closed -type heating system

An additional valve is typically installed for the system’s signing and draining at the lowest point on the reverse pipeline. In the most basic setup, a ball valve is connected to a tee that is placed in the pipeline via a short segment of pipe.

The most basic device for baying or draining coolant into the system

In this scenario, you will need to use a different container or connect the hose in order to drain the system. The manual pump hose is connected once the coolant has been filled up to the ball. Plumbing supply stores rent out this simple gadget.

Another choice is in the case where the coolant is just water supply. Here, the water supply is either linked to the boiler’s special input (for wall gas boilers) or to a ball crane that is similarly situated at the return. However, in this instance, a distinct point is needed to empty the system. This may be one of the final radiators in the branch of the two-pipe system, connected to the lower free entrance where the ball valve is situated. The following scheme presents an additional option. This is an example of a closed type single-pipe heating system.

Diagram showing the systemof a closed one-pipe heating systemwith the system

Block device

Three distinct components make up the heating system security unit, and they are housed in a unique manifold. The devices in the group are as follows:

  1. Manometer. This simple and often used device helps control the pressure of the coolant and maintain it at a safe level.
  2. Air vent. It is used to remove air from the coolant in the heating system. The device works in automatic mode.
  3. Safety valve. It is used to control the pressure indicator in the system. If the set parameter is exceeded, the valve will open, and part of the coolant will be removed from the system.

All of these parts are installed in the collector’s specifically chosen locations. A threaded coupling is used to connect the security group as a whole to the equipment.

Why pressure drops

The following could be the cause of the pressure drop:

  • malfunctions of the heat generator (heating boiler);
  • coolant leaks;
  • excess air;
  • Aluminum radiators.

Visually, the leak may not be visible. Use specialized equipment, such as thermal imagers or ultrasonic devices, to locate it. The radiators’ sectional compounds need to be closely inspected because corrosion may have built up on their surface. Rusted underdecks are a sign of battery damage.

Clicking on the nipple, which is situated on top of the expansion tank, will allow you to find leaks. You can safely conclude that leaks are present if pressure causes water and air to escape.

The principle of work and benefit

In order to prevent emergencies when operating gas and solid fuel boilers, each component has a specific function.

In order to prevent emergencies when operating gas and solid fuel boilers, each component has a specific function.

  • If the fire in the boiler goes out, the water will begin to cool and its expansion will occur over time, which will lead to an increase in pressure in the pipes. The water discharge valve protects the system from the rush, eliminating excess fluid.
  • In the metal body of the air vent, a float is installed, connected to the exhaust plug. Depending on the amount of air in the pipeline, the float automatically opens and closes the exhaust valve.
  • On the dial with the arrows, pressure is displayed in the entire system. Maximum indicator – 6 bar. Various boilers have their own limits for safe operation, before installation, you should familiarize yourself with them.

After a few months of use, the boiler security group’s advantages will become apparent: you can save money on plumbing services. The heating system won’t break down and won’t need ongoing oversight while it operates.

Structural elements

The utilization of all structural components is provided by the heating security group. If not, the block will operate improperly, increasing the risk of various malfunctions and mishaps.

An accurate manometer

This instrument is made to measure pressure (in bars or atmospheres) and provide findings instantly. Two arrows and a messed-up scale on the pressure gauge are needed to accomplish this. The first one displays the heating system’s pressure, and the second one shows the configuration’s limit value.

Any pressure between 4 and 10 bar can be measured by the device. Given that the standard value can fluctuate within the following ranges, these indicators are more than sufficient:

  1. For pipelines of heating systems installed in apartment buildings, 1.5 bar.
  2. In suburban one -story buildings – from 2 to 3 bar.

Maevsky crane

A private home’s or an apartment in the city must have an automatic air vent installed in the heating security system. The ideal height for this is as high as you can go. The air’s easier nature than that of the coolant is the cause of this feature. He ascends and gathers there, impeding the machinery’s ability to function properly.

The following variables could cause the air to appear:

  1. Low quality rubber seals or their premature wear.
  2. First installation start and filling pipes with a coolant.
  3. Corrosion formation inside the mains of the device.
  4. Improper installation or non -compliance of the conditions of tightness.
  5. Watering water.

The configuration of the Maevsky crane prevents even the tiniest dirt particles from entering the air chamber. These specifics are used to assemble the air vent:

  • case with a lid;
  • jet;
  • float;
  • spool;
  • holder;
  • sealing rings of the case and valve;
  • cork;
  • spring.

Safety valve

An expansion tank, which is placed on top of the heating components and pipes, compensates for a rise in coolant volume during heating system operation. The expansion tank’s fluid level changes when the user independently adjusts the output’s desired temperature.

This unit’s performance typically lasts for a very long period. The possibility of any breakdown rises with wear. Since the issue’s source is concealed inside the pipeline, it is physically impossible to identify it. A malfunction of this kind would cause the pressure to rise quickly, damaging the heating system’s components. A safety valve is used to counteract this phenomenon. It is installed with other security group details and guards against device malfunctions. Furthermore, the fluid leak will be visible to the property owner, confirming the issue’s existence.

It is essential to assess the protective valve’s performance before turning it on. Here is how this can be accomplished:

  1. The handle, which is located in the upper part, rotates in the specified direction and opens water.
  2. Then the same actions are made in the opposite direction.
  3. If the liquid still leaks, then it is necessary to open and close the security valve several times in a row.
  4. If the performed manipulations did not give the desired result, then the valve is broken and should be replaced with a new.

Water heater protection

Protection is also needed for accumulative electrical devices that prepare water for household use and indirect heating boilers. The risk in this instance is the expansion of the liquid in the tank due to heating and pressure spikes in the water supply. A boiler security group made up of the following information is installed on the water supply to ensure that the reservoir doesn’t leak:

  • brass body;
  • The reverse valve does not allow water to drain from the container back to the pipe;
  • The valve is safety, dumping excess pressure;
  • Ball crane to close the DHW line.

The security group of a ValTec brand storage water heater

Furthermore, indirect heating boilers come with a temperature switching meter and an automated air vent installed in the upper portion of the tank. Optionally, the pressure gauge can be attached to the device.


Selecting a security group that precisely matches the features of the assembled heating system is crucial. Every component of the group, manometer, safety valve, and air venture has unique operational and technical qualities that must all precisely match the demands of the heating project.

Manufacturers provide prefabricated solutions and security group assembly based on the most popular choices for carrying out home heating, for a range of boiler types and wiring configurations.

Read the boiler’s technical handbook carefully before making any decisions. If it’s an electric or gas wall boiler, it already has a security group that is completely compliant with its guidelines, so there’s no need to create another one. Floor boilers, solid fuel stoves, and fireplaces with a water circle typically don’t have built-in binding or equipment. Read on to learn how to select a heating boiler.

The security group’s components are all fixed on a single console. This is actually a pipe that has two taps to be added to the heating circuit and prepared triples for connecting equipment.

When selecting, make sure to make clear:

  • Diameter for connecting pipes (1 ’, ¾’, ½ ’).
  • Connection option (angular, lower, lateral, etc.P.), from which side should the pipes should be brought to the security group, and how exactly it is to orient.

In any event, the air vent is situated at the group’s highest point. He must therefore continue to be connected. A safety valve and pressure gauge are located beneath it. This is done to ensure that the manometer’s testimony and the explosive valve’s functionality are unaffected by the air that builds up in the air chamber.

Materials used to make a security console include cast iron, nickel, stainless steel, and bronze.

Cast iron is limited to heavy-duty, highly efficient heating systems with extensive pipework and wiring. The majority of these are communal industrial boiler rooms. Stainless steel or nickel are the better options for a private residence. In this instance, an external body of black cast iron can be used to simply close the console and equipment to provide extra security.


There are two primary attributes:

  • permissible measurement range (upper and lower limit);
  • The accuracy of measuring and indication of indications (scale and error).

The measurement range ought to encompass the nominal pressure in the system and allowable deviations during operation, with a margin of 0.5-1 bar.

Suppose for heating, the pressure of 3 atm is accepted nominal pressure. The permissible deviation in the smaller direction will be 1.5 atmosphere. A decrease below 1.5 atm will be considered a signal for the emergence of an emergency. The upper limit will be 4.5-5 atm, after which the safety valve must inevitably work. Accordingly, the range of the manometer should be from 1 to 5-6 atm. It is desirable that the scale is as accurately as possible and indicating the zones of attention. At the same time, the scale is divided conditionally into 3-4 zones marked with color markers, so that even with a cursory look it could be reacted to any deviations.

Air vent

Defined by the system’s operating parameters and working pressure. The majority of automatic valves can be adjusted to install at the ideal pressure and operating conditions. Even with the smallest buildup of air, the valve will function if the adjustment handle is in the minimum position. The valve is less common but accumulates more air when installed to maximum capacity. Describe the difficult installation that will be more suitable. If the heating system is installed independently, it is simpler to leave everything as it is from the factory.

Safety valve

The operating pressure is the primary valve parameter. The circuit’s upper pressure limit, when reached, causes the valve to open and release some coolant. First and foremost, the security group should be selected based on this attribute. Only limited configuration options are available for the operation’s position.

It is helpful to know ahead of time how to set up a security group and how the valve drops the water and in which direction. The side of the heating boiler and the main equipment should guide the turator for discharge. Selecting a slope hose for it is essential.

Maintaining the safety and efficiency of a closed heating system requires installing a boiler security group. This group serves as a buffer, stopping common problems like high pressure that could otherwise cause malfunctions or damage to the system. This configuration’s use of safety valves, a pressure gauge, and an air vent is essential for continuously checking and modifying the internal environment of the system. It guarantees the durability and dependability of your heating system by doing this.

Beyond safety, a boiler security group has many other useful advantages. This offers homeowners comfort in knowing that their heating system can manage internal variations and disruptions without the need for frequent manual adjustments. By preserving ideal pressure levels, which can otherwise result in energy waste and higher utility bills, it also helps the system’s overall energy efficiency. It is possible to view installing such a system as a proactive investment that ultimately saves money.

Additionally, adherence to regional building and safety codes is a crucial factor. Installation of safety devices such as the boiler security group is required in many regions. This guarantees that the system complies with safety regulations and optimal energy consumption practices, in addition to helping to prevent legal issues. As a result, it’s crucial to speak with an expert who can install the security group properly and guarantee that your system complies with all applicable rules and regulations.

In summary, adding a boiler security group to your closed heating system is a smart move that improves system performance and safety in addition to being a technical necessity. In addition to being in line with energy efficiency and legal compliance, it reduces the risks related to pressure and temperature fluctuations. Long-term benefits of investing in such a safety system include protecting your home’s heating infrastructure and maximizing its upkeep and operation.

Video on the topic

Installation of a gas boiler, pump, safety groups

Closed heating system and with your own hands

Filling the heating system with water. Checking for tightness

How and where the expansion tank for heating in a closed system is installed

Installation of an expansion tank in a heating system on a wall bracket

Expande tank in the open heating system

"Wrong" security group.

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Anna Vasilieva
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