It's really hard to say because we don't know the initial water temperature, heating power and water storage capacity. I can give you a formula:
Heating time (seconds) = (reached water temperature ℃ - initial water temperature ℃) × water storage capacity L × 4.8 /heating power (kW)/efficiency
For example: The initial water temperature is 10°C, the water storage capacity is 100 L, the heating power is of 1.5 kW and the efficiency is 80% (the efficiency of electric auxiliary heating of solar water heaters is generally low). The time to heat to 55°C is:
(55-10)×100×4.8/1.5/0.8=18,000 seconds or 5 hours.
3 hours. Huayang solar electric heating takes 3 hours in winter. Solar electric heater is a solar water heater with main and auxiliary functions. It uses solar energy as its main function et electric energy as supplement, so that the solar water heater can work normally all year round. round When the ambient temperature is low, the efficiency is still relatively high.