Fluval 25 Watt Compact Aquarium heater

Fluval 25-watt Compact Aquarium Heater is an automatic, submersible heater for indoor aquariums.
Requiring no manual temperature adjustments, it is designed to reach and maintain the pre-set temperature of 26º C (78º F). The heater's exterior is made of a tough polymer that will not crack or break like traditional glass sleeve heaters.