What is a CREEPER type thermostat?
A creeper thermostat is generally manufactured with a blade type bimetal which has not been pre-formed as is a disc type. Calibration is achieved by either bending the bimetal or adjusting the pressure of the contacts until the desired result is achieved. Essentially a creeper has almost no differential and once the operating temperature has been reached it will switch off and on at or near that temperature. This is ideal for controlling an electric blanket but their usefulness as a thermal protector is marginal since it will maintain the device at the high temperature limit possibly resulting in deterioration of the product. The successive cycling on and off of the power could damage sensitive electronics or pose a hazard to the operator of a piece of equipment.
