Externally equalized thermostatic expansion valves compensate for any pressure drop through the evaporator. However, thermostatic radiator valves (TRV) are now being widely used. A thermostatic storage heater will automatically regulate the temperature in a room throughout the day. The detachable power cord incorporates a thermostatic control for maintaining the desired temperature. There is no thermostatic control within the engine cooling system. Some stoves adjust their own airflow using mechanical or electronic thermostatic devices. Cooling is by pump and fan with a thermostatic by-pass control. Its high thermostatic properties provide insulation. Electric fans are controlled by a thermostatic switch or the engine control unit. Thermostatic control of the cooling system was added in September 1932. Steam traps can be split into 3 main categories; Mechanical, Thermodynamic, and Thermostatic. Most pellet stoves are self-igniting and cycle themselves on and off under thermostatic control. Thermostatic control and timers are available in most lines. With the perfection of the thermostatic control, the electric skillet became a popular kitchen appliance. The band-name Thermostatic was suggested by Michael Strandtoft of the band Helm.