Water Heater 100 Watts is a submersible aquarium and fish tank heater that maintains precise and stable water temperatures for tropical fish, ornamental fish and sensitive aquaculture species. With automatic thermostat control, a shatterproof heating element and easy temperature adjustment, this 100 watt heater is suitable for medium sized aquariums and fish tanks up to 100 litres, giving Nigerian fish keepers and aquaculture operators reliable temperature management for healthy fish all year round.