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Data | Solar PV DC waterheater | Traditional roof solar waterheater |
Water temperature loss at night | Less than 8 degrees celsius | More than 30 degrees Celsius |
Waterpipes | No | Yes |
Vacuum tubes breaking | No | yes |
Continuous cloudy days | Grid electricity | Does not support |
Mounting position | Can be in the bathroom,seperate with the panel | The tank and vacuum pipe must be connected together outside on the roof |
Life span | Service life: more than 25 years for photovoltaic panel: more than 10 years for water heater | Service life: about only 8 years for vacuum pipe and water heater |









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