Do you need to replace the boiler in your home or business? This article will dispel any doubts you might have about changing the boiler for heating in your home or workplace, or in the case of a new installation, and help you understand the operation, and benefits, of each system.

Heating boilers are hot water generators in a closed circuit. This circuit is responsible for carrying the hot water to the radiators. The radiators dissipate the heat that comes to them, heating the room. The water, once cooled, returns to the boiler where it is heated again, and so on.

According to experts providing commercial boiler services in London, whether natural gas boilers, propane boilers or oil-fired boilers, there are two fundamental types of boilers: atmospheric boilers and watertight boilers. The difference exists in the design of the boiler in terms of the air input necessary for combustion and the exit of gases to the outside.

Atmospheric boilers

They are the simplest and also the oldest system. The boiler takes the air from the room to burn. It is not allowed to install them in bathrooms or bedrooms. The atmospheric boiler can also only be installed if it is guaranteed that the vertical draught of the smoke outlet is high enough so that the fumes leave easily, without being obstructed. Atmospheric boilers are influenced by atmospheric conditions: wind, rain, etc.

Watertight boilers

These are equipped with a concentric gas outlet pipe, which allows the extraction of air from the outside and the expulsion of fumes through the same exhaust pipe. Thanks to this arrangement, the sealed boiler is much safer, allowing it to be installed in any room, even if it is a bedroom. For the evacuation of gases, there is an extractor that forces these to go outside. In watertight boilers, atmospheric conditions such as wind or rain, generally, do not affect the operation.

Boilers not only supply heating, but they can also generate sanitary hot water, so they can also be classified into two types: simple boilers and mixed boilers.

  • Simple boilers: These are boilers that only feed a heating circuit. Although its circuit accumulation tanks can also be adapted to obtain domestic hot water.
  • Mixed boilers: These boilers are already prepared with two circuits, one for heating and another for domestic hot water.

Condensing boilers

The condensing boiler boosts performance thanks to the recovery of the condensation heat of the combustion gases. The combustion gases have an important percentage of water vapour that when condensed gives off heat that is used by the boiler. This type of boiler needs a drain pipe that collects the condensation water. Condensing boilers also reduce the formation of nitrogen oxides, thus helping to avoid the problem of air pollution.


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