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Here's a DIYer that did that but instead of hot water used a minisplit https://renewablesystemstechnology.com/solar-heat-pump-system.html https://renewablesyst

• Yetanfou 7y ago
  Although a simpler solution to build due to the absence of liquid coolant I'd still choose a combination of PV-panels with liquid-based collectors attached to the back as this also makes it possible to circulate warm coolant through the collector to de-ice/snow the panels in wintertime.