The utility model provides a heat exchange assemblies that gas hanging stove was used, includes outlet valve, water intaking valve and double -flow -passage heat exchanger, the outlet valve includes electronic two -position three way valve and life hot water passageway, is provided with hot water intake interface, hot -water circulation passageway and cai re outlet port on the electronic two -position three way valve, is equipped with life hot water outlet port on the life hot water passageway, the water intaking valve includes inhalant canal, circulating water channel, cold water inlet channel, magnet rotor, sensor and moisturizing switch, the double -flow -passage heat exchanger includes circulating water channel and adds the hot water passageway, water pump and circulating water channel's water return interface is connected, still including memory steady flow valve core, memory steady flow valve core sets up in the inhalant canal and lie in the front end of magnet rotor. Owing to adopt such structure, setting up of memory steady flow valve core can be guaranteed to get into double -flow -passage heat exchanger water -logging flow stability through inhalant canal, reaches the invariable purpose of life hot water leaving water temperature.