Abstract: A water heater is disclosed having a heat exchanger, a main burner means for heating the heat exchanger, a standing burner, a main fuel passage means for supplying fuel to the main burner, a manual valve on the main fuel passage means which is operable by a manual operation member, an automatic valve disposed on the main fuel passage means at a point downstream from the manual valve, the automatic valve adapted to open in response to the pressure of a supply of water at a water pressure sensitive member, and a standing burner fuel passage means for supplying fuel to the standing burner, the standing burner fuel passage means drawing fuel from the main fuel passage means at a point in between the manual valve and the automatic valve.

Abstract: A water heater is disclosed having a main burner for heating a heat exchanger and a standing burner, and is also provided with an electromagnetic safety valve which is opened by a manual operation member and which is kept in its valve open condition by the electric current from a thermocouple element exposed to the standing burner and a water pressure sensitive member such that it opens in response to a supply of water to the heat exchanger (that is, the water flow is turned on). Both the electromagnetic safety valve and the water pressure sensitive valve are interposed in a fuel passage connected to the main burner. A standing burner fuel passage is connected on one end to the standing burner and is connected at its other end to a point located in between the two valves.