can someone advise me pease? Can anyone think of a reason whey I should not have a combi boiler installed in the space under the stairs? It would be fixed to an outside (brick) walll and would vent directly through the wall. the house is Victorian and the underside of the stairs is not fireproofed in any way. the space under the stairsis an enclosed space and is accessed by a full sized door.
Don't know the details or regs, but I've seen plenty installed under the stairs, so I guess that subject to it being done by a CORGI it must be acceptable.
The space needs to be well vented preferably with 2 x 9"x6" air bricks for adequate airflow otherwise you may have your installation condemned by the gas board.
Many modern boilers draw external air supply through the casing. This serves to keep the boiler case cool, and also the heat which does leak out from components inside the boiler is effectively drawn back into the combustion chamber in the form of preheated air, so it's not lost from the boiler casing (at least, nowhere near to the same extent older boilers used to).
When I was doing my heating calculations to size radiators, I was a bit miffed the boiler manufacturer didn't state the approx heat output from the boiler casing (which you can subtract from the size of radiator you need in the same room). Having installed the boiler (a Keston C25), there's only a small area on the front which actually gets warm (right in front of the heat exchanger), so I guess the heat output from the casing is probably less than 50W. Older boilers are up in the hundreds of watts.
A friend has had her boiler replaced and it's been placed under the stairs as there's no room in the kitchen now. But the flue thing sticks out of the wall at head height. Looks odd stuck there but seems a better idea than putting it in the small bedroom like some others have done.
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