Boiler flues (Viessmann)
Ed Sirett coughed up some electrons that declared:
Modern boilers not only don't need air for the combustion (as it comes
from outside) but also they don't need any for appliance cooling.
And to think that the old Potterton cast iron lump my dad installed in the
mid 70's had a rated output of about one radiator from its case!
Cheers
Tim
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