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Question:

How bad the use of waste electric hot water bag

How bad the use of waste electric hot water bag

Answer:

To continue to charge, so long service life.
If you want to use the time often, I suggest you fill the electricity once, after the water to the cold, that is to say that the use of hot water bags are not without heat, not expansion.
The hot water bag is the use of heating principle, is installed inside the electric heater, after charging to the inside of the water heat, automatically cut off, water will drum up because of heating, water molecular diffusion, so the expansion

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