Uploaded March 2016 | Updated September 2026, 1 hour ago

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Showing heat loss temperatures from my diy solar hydrothermal panel on a partially overcast morning. 0°C outside, and reading 25-30°C heat emitted from the glazing (actual temperature inside the collector is likely 5-10° warmer). I take that as a really positive indicator that this panel is going to work great after the changes are made.