As long as the boiler is 'room sealed' (i.e it pulls air in directly from outside, and expels air and condensate) to the outside you can put the boiler in any room you want.
@user16171 started
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As long as the boiler is 'room sealed' (i.e it pulls air in directly from outside, and expels air and condensate) to the outside you can put the boiler in any room you want.