The best method to work out the wattage of heater required for your home aquarium fish tankis to consider the average ambient temperature of the room and work out how much extra heat will be required to increase the temperature of the water above this.
|Tank Size||Heat 5ºC/9ºF||Heat 10ºC/18ºF||Heat 15ºC/27ºF|
|5 gal/25 L||25 watt||50 watt||75 watt|
|10 gal/50 L||50 watt||75 watt||75 watt|
|20 gal/75 L||50 watt||75 watt||150 watt|
|25 gal/100 L||75 watt||100 watt||200 watt|
|40 gal/150 L||100 watt||150 watt||300 watt|
|50 gal/200 L||150 watt||200 watt||two 200 watt|
|65 gal/250 L||200 watt||250 watt||two 250 watt|
|75 gal/300 L||250 watt||300 watt||two 300 watt|
Using 2 heaters is recommended for your aquarium which are equal to the total wattage required. So for example if you have a 100 litre aquarium and need to heat it from 18 degrees to 28 degrees (10 degree C increase) then the table recommends using a 100W heater.However use 2x 100W heater. Provided you are using thermostat integrated heaters (of which most are these days) then you will not use up any more power or electricity as they wont be on for as long to heat the water. This is simply a precautionary measure in case one of the heaters fails, the secondary heater would still be capable of heating to the correct temperature, giving you time to purchase a replacement second heater.
The boxincludes1 x TROPICAL AQUARIUM HEATER 100 WATT