Maybe you, fitz, should get your figures right first. The Halstead Buckingham is more efficient than you say and condensing boilers are less so.fitz1 said:your boiler on a seasonal average is probably giving you 50 to 60 pence of heat for every pound you put in. condenser gives about 90 to 95 pence of heat . you do the calculations.
And you have to take account of the likely higher lifetime costs of a condensing boiler, given the high cost of installation, shorter service life, greater need for servicing and lower reliability.