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Apparently those are a thing! https://en.wikipedia.org/wiki/Photovoltaic_thermal_hybrid_solar_collector https://en.wikipedia.org/wiki/Photovoltaic_thermal_hybr

• tekknolagi 9y ago
  Fun fact, that's actually what we had in my last house. My dad wanted to heat the pool like that, so he Googled around, found a guy with a patent, and the guy helped him figure out how to build it for the house.