What your engineer told you is true abeit in the right context.You no have to fit a condensing gas boiler if possible.There are certai criteria that would allow you to fit a backboiler such as if the hous is terraced,if the flue has to be extended by more than 2mtrs or if i was just not possible to install a condensing boiler without causing t much extra cost. To determine requirements your corgi installer will carry out a assesmen
-- gasgard
If it's the standard sort of semi (c 1930-60) then there is probably a duct beside the chimney from back boiler to airing cupboard to loft.
unfortunately cost is not taken into account
Assessment score = total of Property type and boiler fuel new boiler in different room extended flue condensate pump or soakaway required
if you score enough points on all the above then it is "assessed as impractical or uneconomic". But uneconomic in this case is not a matter of how much money it will cost.
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