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.
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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...
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