The STAYWARM 2000w Convector Heater has 3 heat settings, choose 750w (low), 1250w (medium) or 2000w (high) and adjust with the variable thermostat dial. Once the temperature is reached the device will switch on and off intermittently when required to keep the air temperature at the desired level. The frost watch protection feature allows the heater to start up automatically if the room temperature dips below 5°c to prevent damage to the device.