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Old 11-01-10, 05:36 PM   #13
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At 4.2kJ/kg*C, and given a 40C deltaT, 2.8KWh/hr () would be 60kg/hr of hot water, or about 15gal. But that's probably not right. I'm guessing the vast majority of the 6.46A is at a COP of 1, i.e. the resistive heating element.

Does it have a "first hour" rating?

Edit: I just thought of something. Does "normal" mode mean it uses the resistive heater every time you take a shower? Unless it has a frugal, intelligent controller, that mode would reduce your COP to maybe 1.2 all the time.

Last edited by RobertSmalls; 11-01-10 at 05:38 PM..
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