All electric Barbecues use what is termed hysteresis control, meaning the power is either on or off depending on the thermostat/thermocouple reading.
The speed of the operation is dependent on the size of the temperature drop when the Barbecue plate is loaded with food. A quick, substantial drop will activate the power to the element which must heat itself before heating the plate. Barbecues that contain an insulated 240 volt element have a protective sheath which slows down the heating process.
Greenplate’s® Inbench Barbecue Unit with a Patented non-insulated element, heats to red hot in seconds not minutes.