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RobertSmalls · 11-01-10, 05:36 PM

At 4.2kJ/kg*°C, and given a 40°C 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.

11-01-10, 05:36 PM	#13
RobertSmalls Journeyman EcoRenovator Join Date: May 2009 Location: Buffalo, NY Posts: 344 Thanks: 3 Thanked 17 Times in 15 Posts	At 4.2kJ/kg°C, and given a 40°C 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..*