ReptiTherm® Under Tank Heaters are an ideal 24-hour primary or secondary heat source for tropical or temperate reptilian species. All of Zoo Med’s Under Tank Heaters are UL/cUL approved (GS/TuV/CE in Europe) and contain a solid state nichrome heating element. These under tank heaters permanently adhere to your terrarium, forming a solid bond for optimum heat transfer. Inexpensive, low wattage heaters. Excellent secondary heat source.   Size: Medium Dimension: 8″ x 12″ (20 x 30 cm) Wattage: 16 w Gal Size: 30-40 ReptiTherm® Under Tank Heater (U.T.H.)Let Ashley walk you through on how to safely and correctly set up a ReptiTherm® U.T.H. for your pet’s habitat.