HONEYWELL S483B1002 DNR S483B1002

Winter watchman is used as a freeze warning device. Completes circuit to household lamp on temperature fall, indicating inoperative heating equipment. It plugs directly into wall outlet. Lamp plugs into receptacle at bottom of winter watchman device. It is useful when house is unoccupied to notify a neighbour of a temperature drop so heating source fault can be rectified before freeze-up occurs. It is not precision calibrated for use as a thermostat.