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Move it to the corner of the wall and make a decorative cabinet in the corner.
If you want to control each other, just connect the hot water pipes. But I advise you not to connect, two water heaters gas water heaters for the vegetable basin hot water, electric water heater bath, so that you can save water and electricity, do not pre-drain a lot of cold water,.
Your own analysis is good, but you must install a valve in the inlet pipe of the gas water heater. Good luck.
The minimum is 12 liters, and the ideal is 16 liters.
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