Balcony wall hanging solar energy water heater is made up of flat plate heat collector, big capacity heat storage water tank, assistant heating system, intelligent control system and pipe circulation system, with the working of complete intelligent digital control and assistant heating system. The heat collector is installed outdoor, storage water tank installed indoor or outdoor; the temperature change sensor (anit-heat, cold and never scaling) pass the signal to PLC, and PLC pass the order to circulation pump to compulsory circle, to offer sufficient hot water all day and night. At the same time it has features of anti-freezing ( media of intelligent compulsory heat preservation and anti-solidification), anticreep (safely connected to the ground and high sensitive digital anti-electricity wall ) to make sure the stable operation of the system.