That would give about 25 to 30 gallons per heater but with the same surface area as before for each heater.
那么每个热水器容积约为25-30加仑,但日照面积都一样。
2
So there is a lot of wind is not hot, such as too much dust on the surface of the heater, PTC ceramic chip failure, voltage failure and so on can cause the wind is not hot.