How to correctly tie a gas boiler schematic diagrams

Our top priorities when it comes to home heating are safety and efficiency. During the winter, gas boilers are essential to maintaining a warm and comfortable home. However, correct installation, upkeep, and troubleshooting require an understanding of how to tie a gas boiler schematic diagram. We’ll simplify the procedure in this guide so that both professionals and homeowners can easily navigate the complexities of boiler systems.

It’s critical to understand the fundamentals of gas boiler operation before anything else. Essentially, a boiler works by heating water to produce steam or hot water, which is then distributed via radiators and pipes throughout the house. The boiler system’s layout and connections are depicted in the schematic diagram, which also serves as a visual installation and maintenance guide.

It’s important to gather the required tools and materials before getting into the specifics of tying a gas boiler schematic diagram. This usually includes a basic hand tool kit consisting of pipe cutters, wrenches, and screwdrivers, as well as a copy of the boiler’s manual or schematic diagram. To guarantee compliance and avoid mishaps, it’s also essential to have a thorough understanding of local construction codes and safety procedures.

The next step is to become familiar with the schematic diagram’s layout once you have all you need. This could entail recognizing and comprehending the functions of important parts like the burner, heat exchanger, pump, and expansion tank. Even though the diagram might initially seem complicated, you can make it easier to understand by breaking it down into smaller parts and consulting the manual.

Now that you have a firm grasp of the boiler system and schematic diagram, it’s time to start connecting the dots. This entails closely observing the lines and symbols on the diagram to guarantee that every element is correctly connected to the others. Pay special attention to details like electrical wiring, valve locations, and pipe sizes because even small mistakes can have serious repercussions.

Step Description
1 Turn off the gas and electricity to the boiler.
2 Identify the components: boiler, pump, expansion vessel, etc.
3 Refer to the manufacturer"s manual for the correct schematic diagram.
4 Sketch the diagram on paper, noting each component"s connection points.
5 Start with the gas supply line and connect it to the boiler inlet.
6 Connect the water supply line to the boiler.
7 Wire the boiler to the thermostat and the pump.
8 Connect the flue to the boiler"s exhaust outlet.
9 Double-check all connections and ensure they match the diagram.
10 Turn on the gas and electricity, then test the boiler for proper functionality.

Scheme of gas heating boiler piping and its elements

December 7, 2016

A heating boiler is a device that heats a liquid coolant by burning fuel. The water circuits of radiators, underfloor heating, boilers, etc. still require heat. A gas heating boiler plumbing scheme is unquestionably necessary in this situation, including all connections to other appliances within the building.

Purpose of strapping

  1. Maintaining a stable pressure of the coolant in the system.
  2. Removing air from the liquid that interferes with its circulation. When an air lock is formed, the water flow through this place is stopped. Air vents are installed in the correct scheme.
  3. Cleaning the heat transfer medium from contaminants. Mechanical impurities worsen the operation of the equipment. In this regard, it is necessary to install filters for cleaning.
  4. Compensation of thermal expansion of the liquid. To prevent the liquid from destroying the system with excessive pressure, a cistern is installed to compensate for expansion.
  5. Connection in the system of one or more circuits.
  6. Hot water storage with a connected boiler.

The simplest scheme with one circuit

The simplest gas heating boiler piping design is created based on its specifications and features.

The gas supply connection to the burner is also part of the piping.

Strapping gas heating boiler: scheme, photo

According to its specifications, the most basic system with a single circuit is created. Install a ball valve and a check valve on the supply side.

Install a pump on the return or discharge pipe to circulate liquid and distribute coolant evenly throughout the rooms. It has a strainer attached in front of it, down the sump. It is recommended that a fine filter be installed prior to the boiler’s fluid inlet.

A closed-type expansion tank is installed closer to the boiler. It contains a diaphragm that permits the release of excess pressure as the liquid expands thermally.

The coolant travels through the circuit to the radiators after the pump. The decoupling via the collector, a unique water collector from which the liquid is dispersed to multiple circuits, is more contemporary. It is kept in a different cabinet, from which the pipes distribute the coolant.

A safety valve is part of the gas heating boiler’s plumbing scheme. The expansion tank might not be able to withstand the pressure spike if the coolant boils as a result of overheating. The following outcomes are possible:

  • ruptures of pipelines and leaky connections;
  • destruction of fittings and pipes;
  • boiler vessel explosion.

Because the pressure inside the boiler begins to rise, the safety valve is placed as close to the boiler as feasible.

A pressure gauge, an automated air vent, and a bleed valve are installed as safety groups on certain units. Although they can also be installed on pipelines, the devices are mounted directly within the boiler water jacket. These parts may be swapped out for others on gas and electric boilers, which turn off the burners or electric heaters when the fluid reaches a certain temperature.

There are numerous ways to connect heating equipment to boilers, but forced and natural circulation are the two main categories.

Natural circulation

The operation’s premise is that heating causes water’s specific gravity to decrease. Cold liquid pushes hot liquid upward, where it travels through the heating elements, loses some of its heat, and then returns to the boiler to be reheated.

To promote natural circulation and less air buildup in the system, supply and return pipes are installed with a slope of at least 3.

The gas heating boiler’s piping (scheme below) is designed to allow for natural circulation, with the radiators positioned above the supply pipe.

The return travels slopingly from the top as well. Natural circulation can be nearly as effective as forced circulation with the right installation and pipe diameter selection.

  • simplicity of the system;
  • easy installation;
  • quiet operation;
  • durability.

A small house with a total floor area of no more than 100 m 2 can be heated with this system. The length of time it takes to heat the space and the difficulty of controlling the temperature in different rooms are among the drawbacks.

With only one heating circuit, small houses and summer homes are the typical settings for the gravity scheme. If they’re not tucked away in the walls, a large number of pipes blight the interior.

Forced circulation

Due to the pump’s intense circulation of coolant throughout the system and its 30% increase in heating efficiency, this approach is the most popular.

The potential for temperature control and minimal pipe consumption during installation are further benefits. Due to its increased complexity and need for additional appliances, the system will still be significantly more expensive. Installed components need to be balanced, and routine maintenance is needed for the entire system. A source of electricity is also necessary.

Installing a combined system will combine the benefits of the two earlier ones. Via a bypass that is installed in tandem with the pump, it can be changed to any mode. The house’s electrical supply will not affect how the heater operates.

Strapping with polypropylene

Everywhere, including water pipes, plastic pipes have taken the place of metal pipes. Products with multiple layers of reinforcement and high pressure resistance are used for heating. Soldering connections allows for the creation of a monolithic polypropylene piping system for the gas heating boiler. Plans can be quickly and with any level of complexity.

Crucial! The heating system is more dependable and performs better when its scheme is simpler.

Gas, as opposed to coolant, is connected to the boiler via a metal pipe that has a vapor gasket on it. The seal doesn’t burn and is airtight.

Strapping floor gas heating boiler: scheme

A traditional floor-standing boiler has small dimensions, but installing it and the strapping takes up a lot of room. It is challenging to arrange all of the equipment compactly, including the manifold, taps, elbows, bushings, and circulation pump.

Since the majority of models are single-circuit, hot water requires a boiler with all connections.

In the event that there is no central water supply, the hot water supply system needs a thermostatic mixer, an expansion tank, and a separate pump.

The boiler’s gas supply must be connected properly. Project documentation, created by experts, is ordered for this reason. In the event of an emergency, access to the gas pipe house is made with a disconnection device present. Special services use specialized hoses, pipes, and other equipment to connect gas.

Installation of the wall-mounted boiler

Even in the kitchen, boilers can be mounted on the wall. They don’t take up much room. The wall-mounted gas heating boiler’s strapping (see the scheme below) is supplied in a set and may even be integrated into the boiler itself. Although compact location equipment takes up less room, maintaining such models is more challenging.

Wall-mounted boilers’ limited capacity is a drawback. Furthermore, the devices require electricity to function, and they hardly ever use natural coolant circulation. However, the majority of boilers already have electronics installed, and they require electricity to function. You can install an uninterruptible power supply unit in locations where the power supply is erratic.

Hot water can be supplied to the house through the two-circuit gas heating boiler piping system found in most wall-mounted models.

The two-circuit version’s drawback is that it disconnects the heating when hot water is being used. This is particularly apparent when the boiler output is low. If sufficient, the coolant’s temperature drops by only a few degrees over the course of a few hours. This is applicable to homes that have enough radiators with thermal inertia and high-quality thermal insulation.

It is essential to comprehend how to correctly connect a gas boiler using schematic diagrams when it comes to home insulation and heating. These schematics serve as blueprints, assisting you in the safe and effective configuration of your heating system. By correctly interpreting these diagrams, you can make sure that your boiler runs as efficiently as possible, maximizing energy savings and lowering the possibility of problems. Learning how to tie a gas boiler schematic diagram is crucial for keeping energy costs down and upholding a warm and inviting home environment, whether you’re a professional installer or a homeowner.


The gas heating boiler’s strapping scheme is designed to meet its specific needs and characteristics. A forced, multicircuit forced circulation system is appropriate for a large house, while a single circuit natural circulation system is appropriate for a summer cottage.

Correct piping of a gas heating boiler – scheme and photos

The diagram on this page will assist you in understanding the proper way to pipe a gas heating boiler if this is of interest to you. Clarity will also be increased with a few remarks on the layout and a few more images.

The simplest scheme of piping of a gas heating boiler

For gas heat generators, the simplest strapping method for a gas heating boiler—which is shown in the scheme below—will apply. which simultaneously integrate multiple devices in their body:

  1. Gas burner, which burns the supplied main or liquefied natural gas.
  2. The heat exchanger of the gas boiler, which is heated by the burner and transfers the heat of the burned gas to the heat transfer medium.
  3. Safety group built into the boiler body.
  4. Built-in expansion tank in the boiler body – expansomat.
  5. Heating system circulation pump built into the boiler drum.

In this instance, the supply and return pipes are connected to the boiler, which is essentially the entirety of the strapping.

When a gas heating boiler is strapped, the plan will start to function as soon as the boiler is hung on the wall and the heating system’s pipes are brought near it. Naturally, if a gas holder or primary gas supply is installed.

In the event that a dual-circuit gas boiler is installed. The output hot water for DHW can be obtained by adding cold tap water to its second circuit.

Scheme of piping with floor-standing single-circuit gas boiler

What will the strapping plan be for a floor-standing, single-circuit gas boiler? It will actually be exactly the same as the one we previously examined. All the parts will be outside and stand separately, with the exception of the boiler drum, which will be "gutted."

It turns out that there will only be two of the aforementioned components in the body of the floor-standing single-circuit gas boiler:

The boiler room will house the safety group, expansion tank, and circulation pump, among other devices.

Furthermore, an indirect heating boiler (IHB) will serve as the "second circuit" in this instance of DHW production.

In other words, although the system has grown more dispersed, it still technically consists of the same components as the two-circuit gas wall-mounted boiler scheme.

Every other feature of the heat-producing apparatus—the chimney. In every scheme, the gas supply pipe and the water supply system with sensors and meters are the same. That is, it is no longer dependent on the type of boiler and can obviously vary.

More on this topic on our website:

  1. Correct piping of a wall-mounted two-circuit gas boiler – device, scheme, connection
    Correct, competent, high-quality organization of heating the house contributes to an even distribution of heat throughout the living area. Gas wall-mounted boiler piping with two boilers.

Scheme of piping of the wall-mounted two-circuit gas boiler

Owners of country houses in the process of construction must decide a very important question, how the premises will be heated. As a rule, private houses do not have the possibility of connecting to the central heating system, so it is necessary to look for alternative options. There are several ways to equip an autonomous heating system at home. Popularly favored option with gas two-circuit boilers. The system operating on blue fuel is characterized by a number of advantages. It is reliable and affordable, as gas is not in short supply in our territories. With its help, you can arrange such a grid that the heat will be not only in a small house, but also in a cottage. Traditional scheme of piping gas wall-mounted boiler Most often owners prefer two-circuit boilers. They are functional and reliable, they allow to provide the house not only with heat, but also with hot water. There are many models of heating equipment on the market. The efficiency of the system depends not only on the device, but also on the quality of installation work. Before proceeding to installation, you need to familiarize yourself with the device of the device, as well as to understand the scheme of strapping a two-circuit gas boiler.

Device of a two-circuit boiler

  • two heat exchangers. One is responsible for heating the coolant in the heating system, the second for hot water supply. As a rule, they work in turns. To avoid inconveniences arising from this, you should buy appliances with a dual heat exchanger;

The type of heat exchanger dictates the piping layout.

Wiring diagrams

So, five pipes are adjacent to the two-circuit gas boiler. One of them is used to carry fuel, and the others are used to move water. If the gas outlet is clear, there will be some messing around with the water channels.

  • one pipe is used to connect the main coolant pipe to the return circuit of the heating system;
  • The second channel connects the same heat carrier from another angle with the pipe of the supply circuit;
  • The third channel is used to connect the socket of the additional coolant with the water pipe;
  • and the fourth pipe connects the channel supplying hot water to the tap with the second heating medium.

Piping plans for different types of gas boilers

The principle of operation of the gas two-circuit wall-mounted boiler is determined by the installation scheme of its piping. It is as follows in this instance.

  1. First, the water is distributed from the main heat exchanger.
  2. The heating circuit is then closed via a three-way valve and the heat carrier starts to flow into the additional heat exchanger. Hot water heating takes place, heating is still in standby mode.
  3. When the hot water tap is closed, the system immediately switches to heating the coolant that circulates through the heating pipes.

Kindly take note!There are drawbacks to this plan. Such a boiler will be more than sufficient for a family of two or three people. A large family will find it difficult for this kind of heating system to adequately heat the home. There will be issues during the operation process.

With a boiler

The plan will differ slightly from the general one if the system is also linked to the boiler. There remains the same amount of pipes. In this instance, an extra heat exchanger is looped into the boiler’s heating circuit. The water pipe does not come into contact with the heat exchanger; rather, it is connected straight to the boiler. From the boiler to the faucet, hot water is transferred. The heating system is still operating, even though the water is hot.

There are several indisputable benefits associated with this scheme, some of which are as follows:

  • The heat exchanger is prevented from being clogged by sludge that remains after heating water from the water supply;
  • When hot water is used, the heating system is not switched off.

Plan for connecting a boiler to its pipework

However, since the boiler is two-circuit and required to supply hot water to the house, one might wonder why there is a need to install a second boiler. This could appear to be a drawback. There are, however, some situations in which such a solution is not necessary. For instance, if a boiler is already installed and the house is adequately heated, but the family does not have access to enough hot water.

With electric boiler

A two-circuit gas boiler that works in tandem with an electric heating device has the proper piping scheme, which differs slightly from the variant mentioned above. The additional heat exchanger’s main pipe is connected to the water supply, and its second pipe is connected to the heating element. Pipes are used to connect the electric boiler’s faucets.

There are several situations where this plan is highly beneficial. The boiler consistently produces hot water because a dedicated heater keeps the temperature there. Investing in a large enough appliance will ensure that you never run out of hot water. Since the water in the heater will already be warm, fuel and electricity can be saved. Furthermore, there won’t be any disruptions to the heating system.

It’s essential to know how to correctly tie a gas boiler schematic diagram if you want to make sure your house is properly insulated and heated. You can maximize the efficiency of your heating system, cut down on energy waste, and eventually save money on utility bills by adhering to the correct schematic diagrams.

First, become acquainted with the fundamental parts of a gas boiler system. This covers the boiler itself as well as parts like expansion tanks, pumps, valves, and thermostats. Your understanding of the overall schematic layout will improve if you know how these components function together.

Next, closely observe how gas and water move through the system. The boiler’s process of heating water and distributing it via pipes to radiators or underfloor heating systems will be shown in the schematic diagram. It will also demonstrate how gas is fed into the boiler so that it can be burned and heated.

Make sure all parts and connections are properly labeled before you bind the schematic diagram. It will be simpler to troubleshoot any potential future problems with clear labeling. Additionally, adhere to industry conventions by using standardized symbols and colors to represent the various components of the system.

For maximum efficiency and safety, your gas boiler system needs to have regular maintenance and inspections. When performing maintenance tasks, such as inspecting for leaks, cleaning parts, or changing worn-out components, keep the schematic diagram close at hand for reference. This will reduce downtime and help you navigate the system more effectively.

You can take charge of the insulation and heating in your house by comprehending and correctly tying a gas boiler schematic diagram. You can enjoy consistent warmth and comfort throughout your living space and lessen your energy consumption and environmental impact with a well-designed and well-maintained system.

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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