I lived in New Guinea for a few years. The hot water for the shower was a box on the roof painted flat black inside. In the box was an old radiator also painted flat black. Cold water from the bottom of the tank connected to the low side and hot water from the top of the radiator back to the top of the tank. Being in the tropics there was almost always hot water for free. The only time not so hot was in monsoon when we would get multiple days of rain. After 3 rainy days it was kinda lukewarm.
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