Lower connection of heating radiators

Few things are more crucial to maintaining a warm and comfortable home than a well-operating heating system. Our heating radiators are essential for keeping a cozy interior temperature, whether it’s a chilly autumn evening or the dead of winter. However, have you ever been curious about the specifics of how these radiators operate? A crucial element that is frequently overlooked but is essential for effective heat distribution throughout your house is the lower connection of heating radiators.

Gaining an understanding of the lower connection of heating radiators requires learning about the workings of the heating system in your house. The point at which the radiator is connected to the boiler or central heating system is known as the lower connection. This is the point at which hot water from the boiler enters the radiator, dispersing heat throughout the space before being reheated back into the boiler. It is this process that keeps your house cozy and warm, particularly in the winter.

For your heating system to operate at its best, the lower connection must be installed and maintained correctly. An appropriately positioned lower connection facilitates effective heat transfer, averting problems such as inconsistent heating or decreased warmth in specific sections of your house. Furthermore, routine maintenance keeps leaks, corrosion, and other issues at bay that could jeopardize your radiators’ functionality.

It’s crucial for homeowners thinking about renovations or upgrades to comprehend how heating radiators connect to the lower surface. Many options are available in modern heating systems to maximize comfort and energy efficiency, including creative radiator connection designs. You may improve the efficiency of your home’s heating system and possibly save energy expenses by investigating these choices and speaking with heating specialists.

Features of the lower connection of heating radiators

  • Ways to connect heating radiators
  • Features of the lower connection of radiators
  • The advantages of the lower connection

A properly chosen radiator heating connection diagram will deliver a more effective coolant supply via batteries with less power loss. As a result, you must select your connection scheme for each unique situation. For instance, you can use the lower connection to make heating radiators blend in with the room’s overall design because in this instance, pipeline wiring is concealed.

Diagram of a heating radiator made of steel.

Ways to connect heating radiators

The most widely used circuits for linking the heating batteries to the central water supply are as follows:

A unilateral scheme is most often found in apartment buildings with central heating. In this case, the connection of the heating system pipes is carried out only on one side of the radiators. With this method of connection, the elements of the heating system can issue their rated power to the maximum. But the efficiency of heat transfer will depend on the amount of battery sections used. For example, during a one -way connection, the coolant is not able to reach the place remote from the side of the connection, as a result of which the effectiveness of such heating is sharply reduced. This is especially noticeable if the radiator consists of 15 sections. Therefore, multi -sectional batteries are better to connect according to another scheme.

Diagram of the heating system with lower wiring.

The more common type of heating radiator these days is bimetallic, and it can be connected via a diagonal cross-cross scheme. The diagonal diagram entails attaching the battery through the upper pipe to the supply pipe and feeding line. The diverting pipe enters the other side through the radiator’s lower pipe before joining the other side. This installation ensures that the coolant is distributed more evenly throughout the radiator, which lowers power losses in the system.

Heat is supplied to the space by the diagonal connection, which is entirely compatible with the specs listed in the equipment’s technical passport. The location of the supply and diverting pipes should be considered when using this scheme. One factor that will cause the battery to lose more than half of its total power is the lower arrangement of the supply pipe during the upper connection of the divert.

For various reasons, the first two radiator installation schemes cannot be used in some rooms. You can use the batteries’ lower connection in this situation. The installation of the supply and diverting pipes from separate sides is required for the lower connection of the heating device. Heat transfer is reduced to 15% as a result of the coolant not reaching the upper sections due to the formation of a through passage. Despite this, homes with separate heating systems frequently employ this type of connection arrangement. Special distribution tubes can be used to fill in the heat transfer.

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Features of the lower connection of radiators

Diagram showing the connections to the lower radiator.

Special radiators are now available, and the lower scheme is used for their connection. The best possible heat transfer is ensured by their design. Such a connection is unique in that it makes use of a specialized plumbing unit that also has bypass and reinforcement.

Steel plates with two sides make up batteries that are connected from below. Welding is the method used to join them, ensuring the creation of technological channels for coolant circulation. Such a battery has two layers of varnish covering the plates, which provides great corrosion protection.

  • G-shaped tube;
  • Multiflex nodes;
  • thermal insulation;
  • set of nuts;
  • pipeline;
  • FUM tape;
  • level.

It is best to complete the lower pipe connection as soon as the house and apartment are being repaired. And the reason for this is that when employing such a plan, the pipes are installed in the wall or the floor. It is advisable to keep this in mind even when screeding a concrete floor.

Crucial! The ability to mount such a battery to the wall is provided by a unique mounting set or node that is specific to each model of radiator with a lower connection.

If covering the pipes on the floor is not an option, they can also be hidden behind a baseboard or a drywall box.

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The advantages of the lower connection

The lower connection is where hot water enters through the battery’s lower section and exits from the opposite side, which is also below. This makes it simple to conceal pipes while sacrificing very little efficiency. Radiators underneath warm up more quickly and effectively than those above at the same time. Fast water current flowing through the battery is the cause of this.

Sometimes the accumulation of air and clogging of the equipment results in a reduction in its efficiency. Although the equipment is heated unevenly by the lower connection, this is not worse than the upper scheme.

Crucial! Regardless of the installation scheme chosen, there are specific installation requirements that must be followed when connecting via batteries. This is mainly about keeping the window’s width and the radiator’s actual proportions in check.

There should be a minimum of 15 cm between the floor and the wall, and 2 cm between them. The level is positioned on top of the battery once it has been placed on the stand. After the battery has been adjusted, the locations of the fasteners—along with the number of sections—should be noted. If there are two fastener locations sufficient for the five sections, then additional fastening will be needed for seven or more. The radiator is then installed after fastening holes have been drilled.

A lower connection indicates more fortification and Mr. foam pouring. However, this needs to be completed only after the heating system has been installed and crimped.

Lower connection radiators – Professional installation

You must select the right radiators for the heating system in order to maintain heat throughout the house. The coolant batteries will receive a good supply of coolant when the heating system is connected thoughtfully according to the diagram. This will result in a significant increase in heat transfer. As a result, you should consider carefully before connecting heating radiators.

1 types of heating systems

Both theoretical knowledge and practical skills are needed to install heating radiators correctly. Because even small mistakes made during installation can cause issues when the heating system is operating. Thus, when connecting radiators, heed the instructions to prevent unfavorable outcomes.

One-pipe and two-pipe heating systems can be identified from the others. Regarding the first species, private homes are the typical settings for such a heating system. One of its good points is that this kind of heating has an adjustable temperature mode. One pipe is used to circulate heated water in the two-pipe heating system, which makes it unique. The coolant that has already cooled is moved via another tube.

A single-pipe heating system has been installed in numerous apartments. This version feeds the system hot coolant from top to bottom. As a result, the batteries on the lower floors will always receive cooled water. One of the drawbacks of a single-pipe system is that temperature adjustment is not possible. This can only be accomplished with additional, pricy special components.

2 varieties of battery installation schemes

Consideration of all the aspects of the heating radiator connection must be made the night before work begins in order to avoid incurring further costs. This necessitates the batteries’ proper wiring. The choice of how to link heating appliances to the central heat supply network determines the ideal temperature in the apartment.

The most common method of connecting heating radiators includes the lateral method. This option will allow you to get the highest heat transfer. Connection of the supply pipe is carried out to the pipe in the upper part of the battery. The drainage of the coolant occurs due to the dialing pipe attached to the lower part of the battery. The input and output of the coolant is carried out on one side of the radiator. It is very important not to confuse the water supply in places, because because of this, the power of the entire heating system will decrease. If the radiators do not fully warm up with this version of the connection, then the extension cord of the water duct can help. In this case, the last sections of the batteries will be able to heat up properly.

Remoskop.Ru’smastershave created a unique calculator just for you. the number of radiator sections is calculated. Figuring out the appropriate number of sections is simple.

Batteries with a diagonal connection work best when using radiators with more than 12 sections. The heating of the batteries will be uniform because of this technique. The upper radiator pipe is connected to the supply pipe. The bottom pipe is where division takes place. The entry and exit of this connection are positioned on the opposing sides of the battery. The radiator power drops by 10% if the return is in the upper section. As a result, it is crucial that everything be attached properly.

Pressure within the heating system drives the flow of hot water through radiators that have a sequential connection. The Maevsky crane needs to be installed for it to operate properly. You can thus remove extra air from the system. When selecting this connection type, be aware of how difficult it is to replace the batteries. Since you will have to completely turn off the heating system in such a situation, it is not very convenient during the cold season.

Radiator connections that are lower are ideal for concealed heating systems. The feed and return pipes in this instance are vertical and attached to the battery’s lower section.

3 installation of heating radiators – connect correctly

It is necessary to attain the horizontal location of the batteries in order to ensure proper installation. Many install batteries that slope slightly in the direction of the return pipe so that all of the water from the radiators drains out at the end of the heating season. It is critical to note how far away radiators are from surfaces. Batteries, for instance, should not be positioned any closer than 8 to 10 cm from the windowsill. There should be 8 to 12 cm of space between the floor and the radiator. There must be a minimum of 5 cm between you and the wall.

It’s necessary to process the wall before you begin installing batteries. Plastering will be required for this. The walls must be straightened and made ready for the finishing touches. After all radiators have had their air lowered, install the valves. They must tighten them using no more than 12 kg of force. A dynamometric key is ideal for this kind of application. It will enable you to use a specific clamp to gradually tighten each valve.

Plugs, gaskets, and traffic jams must be installed prior to repairing the radiators. Furthermore, it won’t harm to position the heat-regulating reinforcement there. Remember that cleaning the surface that comes into contact with the sealing gaskets is prohibited. Since there could be a leak as a result of breaking this rule, the junction of these elements won’t exist.

Brackets will be needed to secure the radiators to the wall. Dowels are used in the process of fixing them. Since the radiators are supposed to hang from the hooks that are positioned between the sections, it is imperative that the bracket placement measurements be accurate. Battery collectors will enter the brackets when positioned precisely. Subsequently, the level must be used to verify the radiator locations. After it’s finished, you can begin attaching the riser to the heating system.

In the event that the heating system chooses to use ball valves, keep in mind that tightness is exceedingly difficult to attain. It is preferable to give professionals handling work with this level of detail. It is possible to use a standard radiator valve in its place. They make working very convenient. It is not worth it to use them in case of leakage.

Whenever a single-pipe heating system is being used, bypass must be utilized. If this component is not installed, the riser will become paralyzed in the event that the heating system’s tap is closed. It is preferable to protect the walls’ thermal conductivity in order to minimize heat loss. A foil that can warmly reflect back into the room from the batteries will be needed for this. Thermal insulation can also be utilized in conjunction with such material to enhance the thermal effect. A "pie" like that prevents heat from escaping outside.

In the pursuit of efficient heating and insulation for your home, ensuring a snug fit and proper connection of heating radiators is paramount. The lower connection of these radiators plays a crucial role in maintaining consistent warmth throughout your living space while maximizing energy efficiency. By understanding the significance of this connection, homeowners can optimize their heating systems to operate effectively, reducing energy costs and enhancing comfort levels. Whether it"s selecting the appropriate piping, positioning the radiators correctly, or ensuring airtight seals, attention to detail in the lower connection process can significantly impact the overall performance of your heating system. With a focus on this fundamental aspect, homeowners can enjoy a cozy, energy-efficient home environment year-round.

4 lower connection of radiators – what you need to know

There are various types of pipe connections available with this option. Radiators have pipes coming out of them that have a one-sided eyeliner for the heating system. When using this option, the upper radiator plug is penetrated by the coolant. The lower battery plug is used to remove cooling fluid.

When using a versatile eyeliner of pipes, the hot water is added from one side of the radiator and the cold water is removed from the other. The best use case for this kind of eyeliner is for personal heating systems. The shortest length is found when closing the feed and returning in radiators with a versatile eyeliner.

The contemporary market can only provide a few different types of radiators with a lower connection. Heating elements in panel batteries can be made up of one or more units. The area of the room that needs to be heated must be taken into consideration when choosing a radiator. As a result, the quantity of installed panels directly affects how hot the space is. These radiators have nodes that are connected. Additionally, a thermostatic reinforcement is pre-installed on panel batteries.

Three types of panel radiators exist. Hospitals and preschool facilities use smooth, hygienic batteries. You are able to recommend a model like PURMO. Additionally, models sell extremely well Kermi.

The profile radiators are the next kind. Sheet steel is used to make them. These batteries have powder sprayed on them from the exterior. Anti-corrosion varnish is applied to radiators to ensure long-term service.

Panels can only be surpassed by steel radiators. The ability to install these batteries from any angle is their primary benefit. The extremity of tubular radiators receives coolant supply right away. This can be beneficial when changing out odd batteries. Any pipe eyeliner can be connected to tubular steel radiators. Consequently, there is no need for the apartments to change the heating system.

5 advantages and disadvantages of the lower connection of radiators

The strengths and weaknesses of this kind of radiator connection must be considered in order to design the heating system in the most efficient manner. The dependability of heating systems with lower eyeliner is one of their advantages. It is possible to complete installation quickly enough because of its simplicity.

Such a connection is quite aesthetically pleasing because the pipes in this version of the installation can be easily hidden to the floor, under the skirting board, or with the help of decorative elements. Effective battery surface heating is another aspect of the strong side. The heat carrier duct’s high speed, which allows cool air to warm up more quickly and rise upward as a result, can also be considered a sign of dignity. The room heats up more quickly as a result.

Convection is good when heating with a lower eyeliner.

It’s preferable to give aluminum radiator sections more ribs to enhance convection properties. The number of plates between the P-shaped panels should be increased when using steel batteries. These radiators emit heat in an efficient manner. The heated surface of the battery radiates heat into the surrounding area through the use of electromagnetic waves.

One of the scheme’s drawbacks is that heat transfer is minimal in comparison to other connection types. There is a big barrier to accessing hidden pipes if the leaks are in the heating system. The cost of this kind of radiator is usually one of its drawbacks. Some people think that because small sections of heating pipes connect to the floor’s entrance collectors, cleaning the heating system with this connection is more difficult.

Even though heating with a lower connection has certain drawbacks, it can still be used and should. Such radiators can offer exceptional thermal characteristics if installed with care. It is possible to create a well-designed room with such batteries because of consideration. Additionally, skillful computation will enhance the heating system’s performance.

Lower connection of heating radiators

What should be done if the type of room is ruined by the heating system? What should happen to pipes if cast-iron batteries can be concealed behind a screen or if more contemporary steel or bimetallic batteries can be installed in their place? Some people use additional curtains to cover them. and others connect heating radiators at a lower angle, which makes the tacit battery connection nearly invisible.

Features of the lower connection

Lower connection of the open type

Three ways to connect:

  1. Connection of ordinary radiators through the lower holes.
  2. Using a set of components from the bottom of steel or bimetallic heating batteries.
  3. Purchase batteries that are designed for such a connection.

Now weigh the approaches, benefits, and drawbacks of different lower connection strategies.

Side border connection

Bilateral connection at the bottom

The connection is not hard in and of itself. Pipes can be found below, hidden in the floor, or above the floor. The pipeline is brought to the lower holes, and the radiator is fastened to the wall. Locking valves must be installed on both sides in order to remove the battery without halting the heating process. The air vent is installed in the upper hole (whichever side it is on).

Connection using the adapter

Scheme of connections Sometimes connecting a standard radiator with the pipeline on both sides is not possible. In this instance, the adapter is usable. It is attached to the bottom hole, and from there, a stainless steel tube is brought up to the top. The heating pipes are connected from below to the adapter itself.

Watching the video that is attached at the end of the article will give you more details about this kind of connection.

Lower connection with an extension cord

An extension cord can be used to complete the lower connection. With no bindings to the upper, the device is twisted into the lower hole. The reason for the coolant circulation is that as water travels through the radiator’s center tube and exits at the end of the heating element, it rises and forces cold water through the element’s output.

There is no place for this kind of connection in gravity systems.

Connection of batteries with lower eyeliner

The wall-mounted pipe eyeliner

Let’s focus on the most practical and acceptable way to establish a lower connection from below, outlining both its benefits and drawbacks at the same time.


The changer of the flow direction

  • It is possible to install an adapter of the flow direction.
  • Both pipe directly from the battery go to the floor or to the wall (or into the pipes located above the floor).
  • When buying radiators with a lower connection, you do not need to worry about the purchase of a suitable thermostat, since it is already installed there.


The battery must have its air removed.

  • Each battery must be installed an air vent .
  • Heating is less uniform and not so effective.
  • Can not be used for a gravity heating system .
  • You need to constantly use a circulation pump.

Radiator location standards

Radiator standards are adhered to

Whichever connection method is chosen, the radiator needs to be placed away from:

  • walls – 5 cm;
  • gender – 10 cm (deviation in any direction is not more than 2 cm);
  • window sill – 10 cm (the minimum distance of 5 cm is allowed).

The thickness of the installed thermal insulation with the reflecting layer (if any) should be considered when choosing a mount. In this instance, slightly longer hook-fixers are required.

Step Description
1 Turn off the radiator valve.
2 Drain any remaining water from the radiator.
3 Remove the radiator from its brackets.
4 Locate the lower connection valve on the radiator.
5 Use a wrench to loosen the nut connecting the radiator to the valve.
6 Remove the old sealing ring from the valve.
7 Place a new sealing ring on the valve.
8 Reconnect the radiator to the valve and tighten the nut.
9 Ensure the connection is secure.
10 Turn on the radiator valve and check for leaks.

Keeping your heating system operating at peak efficiency is essential to keeping your house cozy and reasonably priced. The lower connection of the heating radiators is one feature of this system that is frequently disregarded. This part contributes significantly to the overall effectiveness and performance of your heating system, despite its seemingly insignificant role.

Understanding how crucial it is to connect your lower end radiators correctly will help you steer clear of possible problems like uneven heating, decreased energy efficiency, and higher heating expenses. The heated water from your central heating system enters through the lower connection, where it flows smoothly and uniformly through the radiator.

Poor installation or neglect of the lower connection can result in a number of issues, such as air pockets, blockages, and decreased heat output. These problems not only make your house less comfortable, but they also put undue stress on your heating system, which could eventually require expensive repairs.

As such, it is imperative that you give careful installation and upkeep of your heating radiators’ lower connection top priority. Your radiators can function effectively and deliver dependable, even heat throughout your house with regular bleeding, inspection, and, if required, professional servicing.

In summary, even though the lower connection on heating radiators might seem like a minor detail, correct installation and upkeep are essential to your heating system’s overall functionality. You can optimize energy efficiency, lower heating expenses, and enjoy a more comfortable living space all year long by paying attention to this important component.

Video on the topic

Lower connection of the radiator with g shaping pipe

How to make a lower connection of a steel panel radiator with the exit of pipes from the wall

What type of heating you would like to have in your home?
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Michael Kuznetsov

I love to create beauty and comfort with my own hands. In my articles I share tips on warming the house and repairing with my own hands.

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