In an earlier contribution to this discussion,
Stephen wrote:


If I understood it correctly, they were saying that the "ribs" in the
radiator were closer together? If so would it give off more heat
either because of an increased surface area or because it holds more
water?


If you increase the surface area, you will increase the heat output
(provided you pump more water through it to compensate) - which is why a rad
with fins has a higher output (by about 50%) than a rad without.

But fins is fins and I'd expect all rads of the same basic construction to
be much of a muchness. Fin spacing will have an effect - so my hunch is that
a spread of perhaps 5% would be reasonable but that 15% would be pushing it.

I could be wrong, of course!
--
Cheers,
Roger
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