ollski said:
I've found over 50 variations on the concord conventional flue boilers....any more identifying numbers / letters on it?
I managed to find out it is an ideal Concord C290 series 2 gas boiler rated at 295,000 BTU or 86.5 KW.Now according to my calculations the requirements at high level would be 330cm sq and at low level would be 660cm sq using a guide of 270cm sq plus 2.25cm sq per KW in excess of 60KW for high level and 540cm sq plus 4.5cm sq per KW in excess of 60 KW
Do you now have to have high and low vents going to the outside or can it be just one vent.