Gas water heater is a type of water heater that uses gas as the main energy material, and the high-temperature heat generated by gas combustion is transferred to the cold water flowing through the heat exchanger to achieve the purpose of preparing hot water. Gas fired water heaters are the mainstream water heaters that once dominated the water heater market. Their advantages are that they are ready to use, do not need to wait, and occupy a small area, which can save a lot of space for comrades living in cramped homes.

The control system of a household gas water heater is an electronic control system, usually equipped with a flame detection device and a control device. The control system has electronic ignition, flameout protection, safety interruption, constant water temperature, overheat protection, incomplete combustion protection functions, as well as re ignition, human-machine telephone display, alarm function, and remote control function. There are three types of gas water heater time sequence controller, digital controller, and fuzzy controller.