Zoo Med ReptiTherm Under Tank Heater Ideal for use with reptile, amphibian, small animal, or plant terrariums. One adhesive side "sticks" directly to your terrarium for optimum heat transfer. Reptitherm U.T.H. heaters range from 4 to 24 watts making them extremely economical in operate. Can be used for thermostat and/or in conjunction with an additional heat source higher temperature species.