Do-it-yourself installation of a floor gas boiler: technical standards and algorithm of work

Alexey Dedyulin
Checked by a specialist: Alexey Dedyulin
Author: Inna Alekseeva
Last update: August 2019

An autonomous heating system is the dream of many homeowners. Most of them choose gas heating, a significant drawback of which is the mandatory installation of equipment by certified specialists. However, control over the actions of the invited workers is still needed, agree?

Here you will learn how to install a floor gas boiler according to building rules. We will tell you how to prepare the room for installing a heat generator, how to properly organize the removal of combustion products. Our tips will help you build a safe and efficient system.

The information presented for reference is based on regulatory documents. To optimize the perception of a difficult topic, the text is supplemented with useful illustrations and video instructions.

Preparation for the installation of gas equipment

Those who are sure that the installation gas heater starts with his purchase, very mistaken.

Begin by collecting permits. Simultaneously with the receipt of the necessary papers, you should take up the selection and preparation of the place for the installation of the heating unit, while the following regulatory requirements must be taken into account:

In order to get permission to install heating equipment, you need to go through several stages:

Step No. 1: Obtaining Technical Specifications and Permits.

It is necessary to find out whether, in principle, it is possible to install a gas boiler in a particular apartment or house. For this, an application is submitted to the gas service with a request to carry out such a procedure. It necessarily indicates the estimated annual gas consumption.

The document will be considered and as a result, the applicant will receive permission to install along with the Technical Conditions or a reasonable refusal.

Step # 2: Creating a project for future installation.

To begin with, it is advisable to determine the brand of the meter and boiler, but you should not purchase them yet. Then the installation project is ordered. It is carried out on the basis of previously obtained permission for specific equipment.

The document must indicate the equipment connection diagrams, and the laying of the trunk inside the building from the gas connection point. Only a licensed company is entitled to engage in the project.

Installation of a floor gas boiler
Gas boilers are the most practical and economical option for space heating. Can be used both in an apartment building and in a private house

Step # 3: Getting approval from the gas service.

The new project must be coordinated with the gas service, which serves the site on whose territory the house is located. The procedure usually takes a maximum of three months and a minimum of a week.

At this stage, it is already possible to purchase gas equipment, because in addition to the project, the following documents must be submitted for approval:

  • technical passport of a gas boiler;
  • certificates of conformity and sanitary;
  • operating instructions for the heater;
  • expert opinion on the compliance of the device with all technical requirements.

Obtaining these documents is very simple. The manufacturer obligatorily attaches them to its products. At the end of the verification procedure, the applicant receives an agreed draft on his hands, in which case a special seal will be put.

If the document is not agreed, a list of measures must be drawn up to adjust the project. After they are held re-approval.

Installation of a floor gas boiler
To install a floor boiler, a special furnace room, trimmed with non-combustible materials, is necessarily allocated

Rules for furnishing a furnace room

According to current SNiPs, a gas boiler is installed only in a specially equipped room called a furnace.

This rule cannot be neglected, since gas boiler It belongs to the category of potentially hazardous equipment and should be handled with extreme care. Otherwise, penalties will inevitably follow and emergencies may occur.

Scheme of a boiler room based on a floor gas boiler
The best option for installing a floor gas boiler is to organize a boiler room isolated from residential premises, equipped with a supply and exhaust ventilation system

First you need to calculate gas boiler power, then determine the location for installing the boiler. The instructions allow the placement of single-circuit heating appliances with a capacity of not more than 60 kW in any room of the building. Most floor gas units are single-circuit, because Designed for servicing heating systems only.

Dual-circuit models of any power cannot be installed in the kitchen. These are miniature boiler rooms with a built-in security group and their own expansion tank. For them, a furnace is being equipped. If the total power of the equipment does not exceed 150 kW, it can be mounted on any floor.

More powerful installations or groups of appliances can only be installed on the ground floor or in the basement. In any case, gas heating boilers are not allowed to be installed in living rooms, bathrooms and in bathrooms.

A room intended for a furnace must have certain dimensions. Its minimum volume can be calculated by the formula: 0.2 m³ multiplied by 1 kW of device power, but not less than 15 m³.

Installation of a floor gas boiler
If the walls of the furnace room are made of combustible materials, they are covered with special refractory linings

In addition, a number of requirements are imposed on the premises:

  • the minimum width of the doorway should be 80 cm;
  • minimum ceiling height - 2.5 m;
  • fire resistance not less than 0.75 hours;
  • the presence of natural light, which is calculated as follows: 0.03 square meters. m of window area for every 1 cubic meter of furnace volume;
  • the presence of a gas analyzer associated with an automatic valve that shuts off the gas supply in the event of a leak;
  • arrangement of effective ventilation;
  • the door or wall leading to the next room should be equipped with a ventilation grill, the area of ​​which is determined by the formula: for each kilowatt of heating device power there is 8 sq. see designs;
  • ensuring free access to the heating device and auxiliary equipment for the implementation of repair and maintenance work.

These requirements are strictly required in case of furnishing a furnace room for a boiler with an open combustion chamber. For units with a closed chamber, the room area is not important and the ventilation requirements are less stringent, because they do not use air from the room for their work, but take it from the street.

In the furnace, a gas duct is equipped. Its horizontal section within the premises should not exceed 3 m.

Scheme of a cast iron floor gas boiler
The process of installing a gas boiler largely depends on its device. The figure shows the general scheme of the device of such equipment (+)

Moreover, the number of turns cannot be more than three. The vertical outlet of the chimney is raised above the level of a flat roof or pitched ridge not less than a meter. The materials from which the construction is carried out must be resistant to aggressive thermal and chemical influences.

Multilayer materials, for example, asbestos-cement pipes, can only be used in areas remote from the exhaust pipe by a distance of more than 5 m.

The furnace room should not have cavities or niches formed by horizontal surfaces. Here combustion products can accumulate, which is very dangerous for humans.

The space in front of the heater must be free. The floor in front of it is covered with a metal sheet, the minimum size of which is 1x1 m. It is forbidden to use asbestos cement for these purposes, since it quickly wears out and is harmful to human health.

Diagram of a heating system with a floor gas boiler
The predominant number of floor gas units is designed to heat the coolant in heating systems with natural and artificial type of circulation

Preparing the room for installation

Before starting the installation of the heating device, you need to finish all the work related to the arrangement of the heating system, the installation of radiators, the wiring of the water supply and warm water floors, if any. In addition, the electrics and the sewage system must be fully installed.

The boiler room should also be ready. A solid floor based on a cement screed is laid under the gas boiler or a separate foundation is being prepared.

The latter option is not considered the best. Ceilings, floors and walls, if decorated with combustible coatings, must be additionally protected from possible fire.

For this, non-combustible linings are used, made of roofing sheet steel laid on a refractory gasket, such as asbestos. The thickness of the sheet of the latter cannot be less than 3 mm.

Installation of a floor gas boiler
Depending on the type of floor boiler, the number and type of auxiliary equipment varies. The figure shows a possible installation diagram of the system paired with a wall unit

In this case, the insulation should protrude beyond the dimensions of the device casing along the entire perimeter by at least 100 mm. The minimum distance from the heater to the wall made of non-combustible materials should be 100 mm.

The distance from protruding fragments of valves, burners and automatic control devices to the opposite wall is also regulated. It must be at least 1 m.

If the floor is made of combustible material, it should be protected from possible fire. For this, a platform lined with concrete blocks is used. Its height should be at least 100 mm.

From above, the elevation is covered with a steel sheet, the thickness of which is at least 0.8 mm. It is possible to equip the site for the installation of the device from special refractory plates.

In addition, it is advisable to install auxiliary equipment, otherwise the boiler will interfere with this. It is optimal to pre-execute the layout scheme to think through all the nuances of the arrangement.

According to this scheme, mounting holes are planned on the walls and floor, after which the necessary devices are installed. The heater is installed and connected last.

Installation of a floor gas boiler
Chimney design options for gas boilers of various types

Chimney: requirements for arrangement

Before you do the installation of a floor gas boiler with your own hands, you should prepare a chimney. It is advisable to set the heater on the prepared base, so that the distance between its body and the wall is sufficient for inspection and maintenance of the device. Then mark the location of the chimney.

You can not put the boiler, but markup based on calculations. In this case, several nuances must be taken into account.

Primarily, gas chimney and the hole for it must exactly match the type of floor boiler. So, for modifications with an open combustion chamber, a separate type chimney is installed with a cross section corresponding to the power of the device.

For example, for devices with a power below 30 kW, the pipe diameter should be at least 140 mm; for more powerful devices from 40 kW, a chimney with a cross section of 160 mm or more is selected.

Devices with a closed combustion chamber are equipped with special coaxial chimneys. In the technical documentation of the device, the manufacturer always indicates the required diameter of the chimney.

In addition, it must be remembered that the pipe that will connect the boiler to the chimney should not be longer than 0.25 m. It is also necessary to equip a closing hole through which the structure will be cleaned.

Installation of a floor gas boiler
When installing the chimney, strict compliance with all fire safety standards is mandatory

The chimney from the boiler installed in one of the apartments of a multi-storey building must necessarily be diverted into a common chimney. If there is no such system, gas services do not issue permission to install the boiler. In a private house, everything is much simpler. Here you can mount a chimney of almost any configuration. It is important that it is safe and effective.

According to current regulations, the chimney cannot be mounted near a window opening. The minimum distance between them is 0.6 m. This is necessary to exclude the possibility of returning the exhaust gases to the room.

In practice, sometimes supervisory services allow you to install equipment directly under windows. In this case, it is necessary to make sure that the exhaust pipe is as far away as possible from the window leaf or the opening window sash.

A photo selection will introduce the features of using steel chimneys:

The technology of installing a gas boiler floor type

First of all, you should remove the device from the packaging and check its packaging again. To know what should be in the box, you need to take the operating instructions, which the manufacturer obligatorily puts in the package, and check everything according to it.

If a shortage is found, contact the seller immediately. The same thing needs to be done when there are traces of repair work, dents, etc. on the device’s case.

Another important point is the verification of technical data. Those that are applied by the manufacturer to the device case must exactly match those that are inscribed in the technical passport. In case of non-compliance, contact the seller.

All plugs are removed from the device, if necessary, pipes are flushed. So you can be sure that they do not have random debris that could get inside during assembly.

Installation of a floor gas boiler
The floor gas boiler is mounted on a sturdy podium made of refractory material

Process outdoor equipment installations may vary greatly depending on the type and modification of equipment. In general terms, it represents the installation of the device in its intended place, the subsequent connection of communications and the arrangement of the chimney. We will consider each stage in detail.

#1. Heater installation work

First you need to put the equipment in the place prepared for it. It can be a concrete base, a small podium made of a refractory slab, etc.A strong wooden floor is covered with a metal sheet, which should protrude about 30 cm from the boiler body around the entire perimeter.

For private houses, another option is used. Here, for the heating appliances, a depression is prepared that is 0.3 m below the floor level.

The bottom of such a pocket is poured with concrete, and the walls are finished with any non-combustible material. More often tiled. A floor-mounted gas boiler is usually a fairly massive equipment.

For its transportation, wheels are used, which the device most often supplies the manufacturer. The device is installed on a prepared base and carefully leveled.

Installation of a floor gas boiler
The figure shows a diagram of one of the options for installing a floor gas boiler

It must be understood that the smooth operation of the device largely depends on the accuracy of its exposure. Therefore, the horizontal installation is necessarily checked using the building level.

The equipment is leveled in place with adjustable legs. If not, small pieces of any non-combustible material, such as a metal sheet, are placed under the supports.

# 2 Installation of the chimney

First you need to make holes for the chimney. Once again we check the diameter of the planned parts, it should be slightly larger than the cross section of the chimney pipe. We make holes in the ceiling and in the roof.

Then, we put on the adapter adapter to the boiler outlet pipe, which will be connected to the chimney. An important nuance. Corrugation, as with the installation of wall devices, in this case is strictly prohibited.

The adapter should only be made of sheet metal. After installing the parts, we install a tee and the so-called revision, through which the inspection and cleaning of the chimney will be carried out.

Next, the remaining elements are attached: straight pipe and bend segments. For the passage of the chimney through the ceiling and roof, special parts are used. Particular attention should be paid to fire safety.

Installation of a floor gas boiler
A special nozzle is installed on the upper part of the chimney, which protects the structure of precipitation, debris and wind

Therefore, sections of the passage through the floors must be equipped with non-combustible materials. The chimney must be mounted under a slight slope towards the street. The exact value of the slope can be found in the technical documentation for the boiler. This is necessary for the unimpeded removal of condensate, which inevitably accumulates in the pipe due to temperature differences.

The assembled structure is securely fixed to the wall or ceiling with clamps and brackets. The fastening step of the first is 2 m, the second is 4 m. It is recommended to strengthen the joints of the elements, for this they are tightened with clamps, tightened bolts or wire.

The pipe brought to the surface of the roof or to the wall is raised to the desired height, after which a tip must be mounted, which will protect the chimney from precipitation, debris and wind.

You can familiarize yourself with the assembly and installation technology of the coaxial chimney at popular article our site.

# 3 Heating system connection

At this stage, you need to connect the boiler to the drain and feed pipe of the heating system. For a single-circuit device, this will end the work. For a dual-circuit, you still need to connect to the water supply.

First we connect the heating pipes. Depending on the current heating system, which can be either two or one-pipe, the number of pipes for connection can be different.

Installation of a floor gas boiler
All connections must be made in strict accordance with the rules and regulations, as well as with mandatory sealing

In any case, experts strongly recommend installing a coarse strainer to protect the boiler from particles of scale and dirt that can get into it from the heat main.

The heater is not very sensitive to the quality of the coolant, but if its parameters are very different from those recommended by the manufacturer, additional cleaning equipment should be installed.

This can be, for example, a polyphosphate dispenser or other similar system. It is advisable to install shut-off taps on the return line and on the supply, which will help prevent airing of radiators and make repair of the heating device more convenient.

All connections of elements are carried out strictly according to the rules with mandatory sealing. To seal the threads, you can use the usual tow and paint, or more modern means.

Procedure boiler connection to the water main is carried out almost in the same way. It is also strongly recommended that a filter be installed to prevent unnecessary contaminants from entering the device. It is also advisable to install shut-off taps on water pipes.

It is best to use the so-called "American" with detachable joints, which allows you to quickly replace a worn-out unit if necessary and greatly simplifies installation.

Installation of a floor gas boiler
Only tow can be used to seal gas pipe connections.

#4. Gas connection

You need to know that according to the norms for installing gas floor boilers, this operation can only be performed by an authorized person. You can do the work yourself, but to carry out an assembly check and do the first start will, after all, be an invited professional.

Connection work is carried out extremely carefully and accurately. Start with gas pipe connections with the corresponding element of the boiler.

As a sealant, you can use only tow. No other material will give the required tightness of the connection. Mandatory installation of a shut-off valve, which is additionally equipped with a filter.

At the same time, gas workers strongly recommend installing a high-quality system here. An insufficiently effective filter can cause a boiler breakdown.

For connection it is recommended to use copper pipes, the diameter of which can vary from 1.5 to 3.2 cm, or special corrugated hoses. In any case, special attention should be paid to the quality of sealing joints. Since the gas tends to seep out of leaking joints and accumulate in the room, which is fraught with the creation of an explosive situation.

Behind the filter should be a flexible connection, which is done only with a corrugated hose. Rubber parts are strictly prohibited, because over time cracks appear on them, creating channels for gas leakage.

Corrugated parts are fixed to the boiler nozzle with a union nut. A mandatory element of such a connection is a paronite gasket.

Installation of a floor gas boiler
After installing and connecting the gas heating unit, it is necessary to check the quality of the joints and components. The simplest way to control is to apply a soap solution to the compound. If it bubbles, then there is a leak

#5. Test run

On this, the basic work on connecting a gas boiler has been completed. An exception is appliances with a closed firebox. For them, it is necessary to connect to the electrical network. It is better to do this through a stabilizer.

Then the system can be filled with coolant. This is done as slowly as possible in order to displace most of the air present in it. The fluid is pumped to a pressure of 2 atm.

All connections are carefully checked for possible leaks. After the representative of the gas service inspects the connection and allows the gas supply, you should also carefully examine all the connections on this pipeline. They need to be coated with soapy water and make sure that there are no bubbles. Now you can carry out the first launch of the equipment.

The representative of the gas company that installed the equipment should conclude service contracte, according to which the organization undertakes to conduct regular inspections to study the technical condition and repair of the unit as necessary.

Conclusions and useful video on the topic

Clip # 1. How to install a floor boiler:

Clip # 2. How to avoid errors during the installation of the floor device:

Clip # 3. Example of installation and connection of a gas boiler:

Self-assembly and connection of a gas boiler floor type is among the most critical operations, because the safety of all residents directly depends on the correctness of its conduct.

Do not get down to business if there is no experience in carrying out such work. It’s better to invite experts. Arrogance and frivolity can be too expensive.

You can share personal experience in the field of installation and connection of a gas boiler, ask questions to clarify controversial issues, and give useful advice in the block below the text of the article. We are interested in your opinion regarding the information provided. Please comment.

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Visitors Comments
  1. In the basement they put a gas boiler from the moment of laying the foundation (they built it themselves). It was not possible to place it in the bathroom, as is usually the case in private buildings already built from Soviet times without lower levels. We have wooden floors. I will say right away that the house is big, so it was cold for the first few years in winter. I solved this problem by installing an automatic pump and welding an additional pipe line in two places. Now it’s standing on the wick and it’s warm enough.

  2. With the increase in prices for heating, I decided to do individual, in order to save. I got a gas floor parapet boiler. I found out the price for the installation and decided to install it myself, since the money was tight. After reading a lot of literature, he began the installation itself. The truth before this went around all the services and paid all receipts for permits. Everything worked out for me, I installed the unit, it has been working for three years, there were no problems. So to install a gas boiler on your own is real and, most importantly, economically.