Posted by benoit g.n.c.v. on June 19, 2001 at 20:24:41:
please help me. I'm an inspector for a gaz company and since a couple of year a lot of customers complain about bigger gas bill after the replacement of the old unit,we calculated the degrees/day and compared only the volume of gas not the price of gas.In all cases the old unit was more powerfull than the new unit example: teledyne laars 125000btu/h 80% eff. 1990 replaced by a teledyne laars 85000 btu/h 82% eff. 2000. causing a jump of 25% of the gas consumption . I'm sure the way we calculated the input for the replacement unit is wrong or need a correction factor like a steam boiler(a pick up factor ?) 100% of the old timer installators can't be wrong in the way they choose input for a house but 100% of the replacements we done lower the input about 30 to 60%!!! I'm living in a place who think's "electric" and old timer installators joined the "deadmen"'s club.