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1. EricE+(OP)[view] [source] 2023-09-13 22:25:20
A solar water heater would be a hell of a lot more efficient than generating electricity via solar then trying to heat water with that!
replies(2): >>voisin+h6 >>racnid+x8
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2. voisin+h6[view] [source] 2023-09-13 23:15:09
>>EricE+(OP)
Is that true? I’ve got a heat pump water heater that’s 400% efficient versus direct heating would be somewhere less than 100%, no?
replies(1): >>hattma+qA
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3. racnid+x8[view] [source] 2023-09-13 23:33:10
>>EricE+(OP)
Yes but. It turns out that PV solar wins on maintenance by a lot; since you don't have to run hot water pipes and keep the solar heater from leaking. With a reasonable system design you can pretty much just connect the wires to your heater element.
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4. hattma+qA[view] [source] [discussion] 2023-09-14 03:50:11
>>voisin+h6
I think I read it ends up being close with solar heat still winning. The panels have a range of effectiveness and the heat pump isn't always 400%. The solar thermal is cheap too so even if efficiency were superior with PV panels it would still only be useful if you just had a massive excess of wattage.
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