Using solar energy as the heat source for heat pump water heaters, coupled with heat storage and electricity storage functions, the annual power generation exceeds 440 kWh (calculated based on specific regional sunlight conditions). According to a daily water consumption of 100L, the annual power consumption is 377 kWh. Compared with the traditional electric heating equipment with an annual power consumption of 1697 kWh, the annual power saving is 1320 kWh, and the annual comprehensive power revenue is 1760 kWh.