Boiler information
What is a central heating boiler?
A central heating boiler burns fuel (gas, fuel-oil, wood, etc) in
a "combustion chamber".
The combustion occurs by means of a burner with an addition of air
(oxygen is needed for the combustion).
The heat produced is used to heat up water. A heat exchanger is
used for that purpose.
The hot water is circulated in the radiators (a pump is therefore
required on the installation).
See also Efficiency of boilers.

Source:
DGC
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