Gas heating water heater

The invention relates to the technical field of gas appliances, in particular to a gas heating water heater. The gas heating water heater at least comprises a heating system, a bathroom system and an auxiliary heat exchanger, the heating system comprises a main heat exchanger, a first heating water return pipe and a first heating water outlet pipe, and the bathroom system comprises an electric water heater, a first bathroom water inlet pipe and a bathroom water outlet pipe. Due to the fact that the heating system conducts heating through fuel gas, the bathroom system conducts heating through the electric water heater, the heating system and the bathroom system are both provided with different heating sources, and synchronous heating and bathing can be achieved. Due to the fact that the heating system and the bathroom system can conduct heat exchange through the auxiliary heat exchanger, heat generated when any one of the heating system and the bathroom system is operated can be utilized by the other system, a