AquaTop's PISCES Nano Aquarium Heaters. The compact design allows for versatile placement in small aquariums such as our PISCES All-in-One Aquariums. Each unit has a built-in electronic thermostat preset to 78 degrees Fahrenheit for precise temperature-controlled accuracy of ±1.8 degrees Fahrenheit. When the target temperature of the heater has been achieved, the unit will shut down and stop heating the water. Constructed from a heat-resistant quartz material, the PISCES Nano Heaters will heat your aquarium water quickly and accurately, plus the included suction cups allow quick and easy installation. May the PISCES Nano Heaters help keep your aquatic creatures warm! Feature: Made with Heat-Resistant Quartz Tubing Heats Quickly & Accurately Shuts Down when Target Temperature is Reached Includes Suction Cups for Quick Installation Technical Specifications Tank Capacity: Up to 8 gallons Power: 25W Volt: 100-120V/50-60Hz Temperature Range: Preset to 78°F Replacement Heater for PCS-5G, PCS-5GB & PCS-5GC