It doesn't matter if there is no sun.
Generally speaking, current solar water heaters are equipped with heating devices to prevent rainy days.
Even if there is no heater, as long as there is hot water reserved the day before, there will usually be some left the next day. Because solar water heaters are usually equipped with insulated water tanks and heat storage devices during the design process. The hot water collected by the collector tube should be stored in an insulated water tank to avoid heat loss.
The capacity of a solar water heater refers to the capacity of water that can be used in the water heater, excluding the capacity that cannot be used in the tube empty. For pressurized solar water heaters, its capacity refers to the capacity of the medium in which heat exchange can take place.
Detailed information
The solar water heater is a heating device that converts solar energy into thermal energy. It can heat water from low temperature to high temperature to meet needs. people's needs in life, the use of hot water in production. Solar water heaters are divided into vacuum tube solar water heaters and flat panel solar water heaters based on their structural shapes. Evacuated tube solar water heaters are mainly used, accounting for 95% of the domestic market share.
Home evacuated tube solar water heaters are composed of heat collecting tubes, water storage tanks, brackets and other related parts. The conversion of solar energy into thermal energy mainly relies on vacuum tubes which use the principle that hot water is used. floats and cold water sinks, causing microcirculation of water to obtprovide the required hot water.
Reference documents:
Baidu Encyclopedia - Solar water heater