The incredibly energy efficient 4 watt heater, this bed is sure to please.its the hottest thing going! All K&H heated beds and pads feature dual Thermotats and are designed to warm to your petnormal body temperature when he/she lies on the pad. When your pet is not on the pad, the heat will dissipate into the air and the surface temperature will vary according to the ambient air temperature.All K&H heated products are Thermotatically controlled to heat to 102F, regardless of the size. Dual Thermotat simply means there are two internal Thermotats that will keep the surface of the bed at 10-15FF above ambient air temperature when your pet is not on the bed. When your pet lies on the bed,itill warm to about 102F.