Is it necessary to change the vacuum tube, a heavy snow, solar water pipes are frozen, maintenance costs are too high, if you do not have to change the vacuum tube, I am ready to repair
If equipped with auxiliary electric heating device of solar water heater users should pay special attention to water, to prevent dry burning. "In order to prevent dry heating, water heater can give users with color temperature and water level automatic control device or instrument.
Is it necessary to change the vacuum tube, a heavy snow, solar water pipes are frozen, maintenance costs are too high, if you do not have to change the vacuum tube, I am ready to repair
