How to fill the solar water heater with water ?

Three ways.
1) Install an overflow pipe, and turn on the water valve once you see water flowing out from the overflow pipe and turn off it.This needs to be manually closed. If the water valve is not closed in time, the water will always flow out of the overflow pipe. But this method is the most economical and does not require any extra accessories.
2) Install auto feeding tank on the top of tank, it charges water automatically by float ball valve inside feeding tank, it keeps tank always full of water.This is a bit like the principle of a toilet. As the water level drops, the ball valve falls off and opens the water valve until the water level rises to close the ball valve.
3) Install controller, its sensor can detect water level and temperature and show info on the screen, it can start feeding water and heating automatically. This is the most convenient and intelligent.

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Keywords: Solar Energy , Non-pressure solar water heater, Pressurized solar water heater.