In an earlier contribution to this discussion,
Stephen wrote:

On Thu, 6 Aug 2009 19:49:35 +0100, "Roger Mills"
wrote:

No, nor can I! Would you care to provide URLs for each of the 3
sites?

Here you go:

Kudox (at B&Q) 500m x 1400mm has a 7053 BTU (2.07kW) at dt=50

http://www.diy.com/diy/jsp/bq/nav.js...mm&x=2 8&y=14


Quinn 500 x 1400 is 7941 BTU (2.33 kW)

http://www.discountedheating.co.uk/s...m_High_K2.html


Myson 500 x 1400 is 7094 BTU (2.08 kW)

http://www.discountedheating.co.uk/s...mm_High.h tml

I cannot understand why the Quinn is so much higher than the other
two.


Thanks for the URL's. I'm afraid they don't reveal any obvious reasons for
the differences.

My own rules of thumb would give a figure of 2000 watts at dT=50 (or 2500
watts at dT=60) for that size of radiator - which stacks up quite well with
2 of the 3 offerings. My immediate thoughts were that the Quinn/Barlo one
may have been measured at 60 even though they claimed 50 - but that would
take it to 2500 instead of 2350. I suppose they *could* have measured it at
55 - that would be closer, but still not quite right.

In any event, I would be inclined to suspect the Quinn figures. Unless
they've found a clever way of defeating the laws of physics, their design is
unlikely to be 15% better than everyone else's.
--
Cheers,
Roger
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