Yuxi solar wall heaters can be divided into two basic types according to the working fluid of different collectors, solar heating systems, one is for the heat transfer liquid refrigerant to provide heating, cooling and domestic hot water, called Solar hot water systems; the other is air as working medium heat, according to the heating and heated with hot air, called a solar hot air systems; both in the equipment, systems and structure, has a great performance and features differences. Yuxi solar wall-mounted solar water heaters, also known as solar hot water systems, by collectors, thermal storage tanks, heat exchangers, auxiliary energy heater, control systems, pumps, piping system components, as the use of solar energy a device as a whole, but also known as a solar hot water system. Domestic solar water heaters solar hot water system called the smallest, its composition and the large-scale solar hot water system is basically the same. Yuxi solar wall-mounted solar water heater system itself is relatively simple, with the use of different places and goals, has now developed at many different design patterns. 1, according to the sub-collector working fluid circulating loop mode (natural circulation and forced circulation), 2, DC-style, including the type and constant temperature thermal siphon drain type.