Used as a freeze warning device. Completes circuit to household lamp on temperature fall, indicating inoperative heating equipment. This device is useful when the house is unoccupied to notify a neighbor of a temperature drop so that the heating source fault can be rectified before freeze-up occurs.

Features:

• Plugs directly into wall outlet.
• Lamp plugs into receptacle at bottom of Winter Watchman device.
• Not precision calibrated for use as a thermostat.