compact solar water heater 

1. Superconductive tube conducts heat uni-directionally, so it has small heat volume, low start temperature and quick speed;
2. Superconductive tube has good low temperature resisting, it can not be frozen and cracked even in the environment with very low temperature;
3. The lining of water tank is welded under high frequency and the pressure-bearing of the water heater has 0.6 Mpa and 0.4 Mpa, which can be directly connected with tap water system to operate automatically with pressure-bearing;
4. No water runs in the vacuum tube, therefore the shortcoming of heat efficiency lowering due to occurrence of scale is eradicated;
5. No water runs in the vacuum tube, therefore the shortcoming of bursting of tube or water leakage due to aged rubber ring is eradicated;
6. No water runs in the vacuum tube, therefore it cannot be frozen or cracked even under seriously cold condition;
7. Incase single tube is broken, the water heater can still operate normally;
8. With full automatic pressure-bearing operation, tube can be emptied.