25w-300w Aquarium Fish Tank Heater Submersible Thermostat for Tropical Tank
300W 66---90 gal [MAX Tem. 25W 4---11 gal [MAX Tem. Choose the heater you require by using the rule; 1w per 1 litre of water in your aquarium. So if you have a 200 litre aquarium a 200w heater will be sufficient. ].