On Fri, 7 Aug 2009 11:26:14 +0100, "Roger Mills"
wrote:

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.

From Quinn: "I can confirm that the output is correct this is due to
our design of the vertical water channels being at a market leading
pitch of 25mm combining our convection fin configuration gives us a
high performing radiator."

I may still go for the 1600mm, just to be sure.