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[–] carnold03 ago 

Is your water heater electric or gas? Is the tank insulated? How much do you pay per kilowatt hour?

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[–] bikergang_accountant [S] ago 

Electric, insulated, 2.07 cents per kilo. The insulation wouldn't really matter on whether that kind of solar makes sense or not. It lowers the cost of bringing tap water to temperature.