12-29-2020, 06:24 PM
I just discovered that the house I am considering buying in HPP has a two year old electric water heater, and am trying to understand why anyone would buy this in Hawaii (as opposed to having a relic they haven't yet replaced). I see suggestions here of coupling it with a PV roof system, but the house does not have this. How competitive would this be with simply having a solar water heating system on the roof? Using PV electricity to heat the water sounds less efficient. Or is it more efficient because it can use the PV power just when other electric demands are low but the sun is still shining?