An infrared flame sensor apparatus useful for detecting a flame in the combustion chamber of a water heater or boiler is disclosed. An infrared phototransistor with narrow light frequency response detects the infrared components emitted by the flame. A flame signal proportional to the amount of infrared radiation detected is generated. The flame signal is filtered to remove transients that may give a false or oscillatory signal indication. When the amplitude of the flame signal is in excess of a predetermined amplitude an indicator is illuminated or an alarm is activated.

A motor actuated electric valve includes a DC motor, a gear reducer assembly, a valve body and a fluid diverter mechanically attached to the output of the gear reducer assembly. Rotation of the motor results in repositioning of the diverter within the valve body. Unidirectional and bidirectional operation of the motor are achieved via a rectifier circuit and cams which actuate limit switches to interrupt operation of the motor when the diverter is in a first or a second desired position. The valve is readily substituted for current AC actuated valves since the rectifier is incorporated into the valve actuator.