Can anyone tell me how many radiators a Sime Format 80C gas boiler can normally run efficiently. I moved into a new house recently which has this boiler. Instruction manual has no info re power output. The system is only running 4 average size single radiators at present and I want to add more but am concerned as to what the boiler can handle

Elaine, February 2007

Normally ref to 80 in the name is the output in most cases 80,000 btu's in old money or 23kw in new, so it should handle another 4 decent size rads.

Nik, June 2007

this boiler can heat a three bed house with ease my friend. but you do need an indepenent supply of 15mm to run three rads, at least

don, February 2007