Roger Mills wrote:
In an earlier contribution to this discussion,
Andy Champ wrote:

Roger Mills wrote:
Not exactly - it's not quite linear. The factor given by Stelrad is
0.798 - whereas 50/60 gives 0.833
I'm surprised it's anything like linear. I would have expected it to
be related to the difference between the rad temperature and the room
temperature - which would mean the conversion is more like
(50-20)/(60-20) or 0.75.

aHA! Found the table! But it's in a PDF.

http://www.stelrad.com/uk/docs/lst_2.pdf

last page (they are *very* big pages!) it's the table near the top at
the left of the rightmost quarter of the page (IYSWIM) and note that
the temperatures are differences to room temperature.


Yes indeed! The 50 and 60 referred to above are Delta-T values - not
radiator temperatures.

Ah Muy bad..