At present, there are more than 300 manufacturers producing air energy water heaters, and many manufacturers of gas water heaters and solar water heaters have invested in the R&D and production of air energy water heaters. Midea and Haier, the leading household appliance enterprises, Wanjiale and Huadi, the gas water heater manufacturers, and Gree, the domestic air conditioning giant, have successively turned to air energy water heaters.