In an earlier contribution to this discussion,
The Natural Philosopher wrote:

Stephen wrote:
On 6 Aug 2009 19:13:28 GMT, YAPH wrote:

suggest you check the article on radiators in the wiki - it has a
formula for working out the output of any standard rad given its
sizes and configuration

But that was my question. If all radiators that are the same height,
same width, and all double finned, why should one make have a higher
output. If they are all constructed the same and obey the same
formula, should all outputs be equal?

The heat output of a radiator is also critically dependent on its
working temperature and the ambient temperature. So the same rad can
have many different outputs depending on how its measured.

If it was red hot, it would output a fair but more..

Yes, we *know* that - but manufactuers' published data should surely all be
based on measurements made under the *same* operating conditions - certainly
when they quote the same delta-T.
--
Cheers,
Roger
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