How to choose a gas boiler? What You Need to Know - Tips + Videos & Photos

How to choose a gas boiler? What You Need to Know - Tips + Videos & Photos How to choose a gas boiler? Problems with central heating make many users think about buying a gas boiler that will work autonomously. The boiler has the function of heating the coolant, thanks to the combustion of gas. The choice of this equipment is due to its economy, because other types of combustibility are either several times more expensive, or there is no sense from them. Plus, modern technologies have reached the point that one can hardly observe the boiler, it will automatically heat up as long as there is a combustible substance. For proper functioning and was optimal, it is necessary to select it correctly and carry out constant maintenance.

There are a huge number of types of boilers, you need to think carefully in advance which one is right for you.

Criteria for choosing a gas boiler

  1. How to choose a gas boiler? What You Need to Know - Tips + Videos & Photos Power
  2. Material of which the body is made, etc.
  3. Future installation location
  4. Automation for stable and safe operation

All these criteria are interconnected, because if there is no place for installing a large boiler or it will be installed in the kitchen area, it must be visually beautiful, you have to opt for models that are attached to the wall. They will work at a much lower power than floor-standing ones.

Material and construction

When choosing a heat exchanger, it is necessary to carefully consider and weigh everything.

After all, there will be liquid inside, and outside it will be exposed to high temperatures. Therefore, the material must simultaneously possess such qualities as strength and thermal conductivity at the same time. The higher the transfer of heat energy during gas combustion, the higher the boiler efficiency. Most often, manufacturers make heat exchangers from cast iron, steel or copper. Due to the fact that these cast iron materials do not tend to rust when exposed to water, they are considered one of the longest in use.

But he has such a disadvantage as heavy weight. If used improperly, it can burst at the intersection of different temperatures, so it must be washed more often.

Steel heat exchanger is the most popular. Its price is lower than that of cast iron and copper. This material is very flexible, this eliminates the appearance of cracks.

But a heat exchanger made of steel is prone to corrosion.

Copper heat exchangers are much more resistant to rust, they also have the highest level of heat transfer. Copper is lightweight and small in size. The disadvantage of this material is its overpriced, but it justifies all expectations.

In the first channel of the heat exchanger, the liquid for the heating system is heated, and in the second for domestic needs and water supply.

Inside, the heat exchanger system can be either the most common or bithermal. In the first case, it is possible to connect only one water circuit, and in the second several.


Installation of gas boilers can be either on the floor surface or suspended from the wall. Models of the first type are called floor-standing, they are very large in size. In many cases, they have a cast iron or steel heat exchanger.

After all, it is these materials that have a lower price for boilers and a good level of power. A significant drawback in choosing floor-standing boilers is their huge dimensions and they weigh a lot. And the mounted ones have several times less heating power, so the choice depends only on what you expect. For example, a large house needs a more powerful boiler, and a wall-mounted boiler would be ideal for a small room.

Number of circuits

In order to organize only heating in the room, or only heating of water, a gas boiler with one circuit is perfect.

If you plan to connect a water supply system, batteries and something else, then you will need a boiler with two or more circuits.

Many boilers with two circuits produce water heating in an instantaneous way, and this is very expensive. It is recommended to connect the boiler separately to save money.

Combustion chambers

In order for the gas in the boiler to burn, oxygen is required. It will come either from the premises or from the street space.

In the first version, there must be a burner for a natural air flow, in the second it is forced.

There are two types of chamber combustion:

  • How to choose a gas boiler? What You Need to Know - Tips + Videos & Photos Open - air is removed from the room where the heating unit is installed.
  • Closed - air is taken from the street, using a chimney or a special pipe.

In order to understand which option is right for you, you need to know that for the second you need a chimney with a height of about five meters. Not every room will be able to do this.

To warm up a room in an apartment building, it is worth purchasing a boiler with an oxygen blower and a built-in chimney. This has a higher level of efficiency and is easy to integrate. But its disadvantage is that it is dependent on electricity. Without a network connection, it will not work.

Which power to choose the boiler

The nominal power must be indicated in the documents for the gas boiler.

Almost all manufacturers write the size of the room that the boiler is capable of heating.

But these are all approximate figures, when making your own calculations you should take into account:

  • Room dimensions,
  • Weather conditions in your region,
  • Wall insulation,
  • All windows,
  • Balconies and doors,
  • Central heating.

Besides all these factors, you must consider the quality of the gas and its pressure. We calculate the DHW system separately. Then we add both amounts and add 20% to them for permanent use of the gas boiler.

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How to choose a gas boiler? What You Need to Know - Tips + Videos & Photos