I want to build a solar water heater, is it safe to use Black PVC pipe
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This will be for a hot tub made from a Tractor Supply Co. Water trough. How much PVC pipe will I need? I get at least 8 hours of direct sun at the location.
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coiled up black hose on roof or roof shed close to the hot tub and water source.
Black pipe is not for water. Not clean water anyway.
Black plastic pipe is used for irrigation systems. Ok for your solar water heater. You will need to experiment on how many coils you'll need to get the optimum temperature.
YouTube has an abundance of videos on how to create solar projects.... here's one.... https://www.youtube.com/watch?v=1tTtPLGjOJo
Here's another one of my favorites.... https://www.youtube.com/watch?v=ehDgXrpRlTU