Gas control valve in water heater

摘要

A gas control valve in a water heater is provided with a unipolar overheat prevention terminal of which the connection structure is simplified in the magnetic circuit. In a flame-retention, storage type closed vessel gas water heater for automatically controlling the temperature of hot water in a tank to a desired level, the unipolar overheat prevention terminal 7 is mounted in the main body of an ignition/extinction unit A as held with a retaining projection 15 provided integrally on a cover 14 of the ignition/extinction unit so that it can hardly be detached while being separated from a gas shut off magnetic valve MV mounted at the upstream side of a gas flow passage 1. As the unipolar overheat prevention terminal 7 is arranged connectable with a burner flame detecting thermocouple TC, the burner flame detecting thermocouple TC and the gas shut off magnetic valve MV in the magnetic circuit are connected to each other by the unipolar overheat prevention terminal 7.