Can I drink the solar water heater's water?

Even if the solar water heater interior material using food grade material, but this not guarantee that water is drinkable.
Solar water heater is not a closed system; it's opening to the air.
The bacteria can from the air and water itself will growing and multiplies very fast. at a wet warm environment.
So please don't drink the hot water from solar water heater.
(Except pre-heated pressurized solar water heater, dual heat exchange split system water from up heat exchanger)

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