Hi. Our old Rayburn multifuel cooker/boiler just died, and I need to
replace it with something else. The rayburn used to run a central
heating system of 13 radiators with a total area of approx 12 square
yds; 9.6 square metres.

Can anyone tell me what Btu output figure the replacement stove should
have to run the existing radiators comfortably? Or where on the web I
could find the formula to work it out for myself?!

Many thanks.