Small yet powerful, the mini 25-watt Marina Submersible Aquarium Heater provides reliable heating  The heater includes many practical features for easy use, safety and convenience, including an easy-to-access temperature set dial, on/off pilot light indicator, and a bumper guard for fish safety.50-watt submersible heater for fresh or saltwater aquariums.Easy-to-access temperature set dial.Easy-to-read temperature settings.On/Off pilot light indicator.Impact-resistant glass design.Bumper guard for fish safety.Water proof sealing.Pilot light.Includes bracket with suction cups for easy, secure installation.CSA approved.Temperature heating range: 20° C to 28° C (68° F to 82° F).