Keep the winter chill off your fish tank with an aquarium heater, an essential for most tropical aquariums. Most heaters will automatically adjust to maintain a certain temperature. A continued constant flow throughout the tank will help your heater to achieve this. Two heaters would be ideal in larger tanks as one may stop working, leaving you with a sudden drop in temperature. Smaller tanks can also benefit from this. Make sure to purchase a heater that is suited for the size of your aquarium. Usually a 100 watt heater would be used in a 100 litre tank. A 200 watt in a 200 litre tank and so on. Choose from our range of heaters below.