A new formulation for removal of incrustation on aluminium heater surface is proposed.
提出一种清除铝换热器表面水垢的新配方，该配方由有机磷酸和硝酸组成。
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。
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.
出风不热的情况有很多，例如加热器表面灰尘过多、PT C陶瓷片故障、电压故障等等原因都能造成出风不热的情况。
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