3 ms·
https://en.m.wikipedia.org/wiki/Solar_water_heating https://en.m.wikipedia.org/wiki/Solar_water_heating
by ZeroGravitas 4y ago
https://en.m.wikipedia.org/wiki/Solar_water_heating https://en.m.wikipedia.org/wiki/Solar_water_heating
- crazygringo 4y agoThanks. That's wild, never heard of them before. Now I am indeed curious what the minimum amount of sunlight required is. I'm sure the angle of the sun is just as important as the duration, on top of weather and seasons and temperatures.