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NiHaoMike · 05-06-09, 06:37 PM

Actually, a heat pump with a COP of 2 would put 3 units of heat into the water for every unit of energy used. It would transfer 2 units from the air and the remaining unit will be from the electricity used. I remember reading that heat pumps use 1/3 the energy as a regular heater so it sounds about right.

05-06-09, 06:37 PM	#11
NiHaoMike Supreme EcoRenovator Join Date: Oct 2008 Location: Austin, TX Posts: 1,154 Thanks: 14 Thanked 257 Times in 241 Posts	Actually, a heat pump with a COP of 2 would put 3 units of heat into the water for every unit of energy used. It would transfer 2 units from the air and the remaining unit will be from the electricity used. I remember reading that heat pumps use 1/3 the energy as a regular heater so it sounds about right. __________________ To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...