Automatic boiler damper

The combination of a heating system, a stack venting said heating system, a vane-type damper pivotably secured to said stack about an axle passing through the surfaces of said stack, the improvement comprising an automatic boiler damper having an electrically operated solenoid coil adapted to manipulate said vane into an open position, venting means adapted to permit a small amount of stack gases to emerge through said vane when said vane is in a closed position, temperature sensing means, said temperature sensing means including a temperature sensing element adapted to sense the temperature of said small amount of stack gases, said temperature sensing means adapted to supply energizing power to said solenoid coil upon reaching a pre-determined temperature level thereabout, said temperature sensing means including a pair of normally open contacts, said pair of normally open contacts being disposed in electrical touching engagement to each other when the temperature of said temperature sensing element reaches a preset temperature level, said pair of normally open contacts in a series electrical circuit with said solenoid coil, said series electrical circuit provided with operating power derived from said heating system when said heating system is electrically operated to produce heat.