On the contrary, air saves more electricity than solar energy. Because the peak time of water use is at night, if the hot water heated by solar energy runs out during the day or when there is no sun, it is necessary to switch to electric heating, and the electricity consumption is four times that of air.
Calculated by 1P with home computer:
At room temperature, 160 ~ 200L hot water can be generated every two hours, which can be used by 3 ~ 6 people. The daily electricity consumption is about 2 degrees (it will be slightly higher in cold weather when the ambient temperature is low), and the daily cost is about 1 yuan, so the average monthly electricity bill of a family of 2-4 people is only 20-30 yuan. The general gas cost is about 150 yuan, while the 200L electric water heater heats electricity every day 15 kwh, and 7.5 yuan 200 yuan every month (the electricity consumption will be higher in cold weather). Compared with electric water heaters, air energy water heaters can save about 70 ~ 80% of the cost every month.