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Peak COP and year average COP is quite different. You'll never get the higher COP when producing hot tap water in the summer. Also a some brands don't include the power consumed by the circulation pumps when calculating COP :(

I've never heard someone reporting a year average COP of more than 4. Still, when already at 3.5 or so, higher COPs mater less and less. The difference in savings from 2 to 3 is huge, from 4 to 5 is miniscule in comparisation.

by jkirkebo (jkk@scm.no) on Tue Jul 11th, 2006 at 04:05:49 AM EST
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