On 2006-09-15 13:00:54 +0100, F said:

Anyone able to point me to a source of radiator output figures please?

I've got an old double radiator 600mm x 1920mm (no fins) that I need to
replace and want to match the output.

Radiator manufacturer web sdites.

Find something close to what you have. Scale it's output in terms of area.

If you have a conventional boiler running at 82 degrees, then the
actual heat output is about 80% of the nominal quoted figure