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  About Heaters

Heater calculation table

Instructions:

Subtract the average temperature of the room the aquarium is located in from the temperature you wish to maintain the aquarium water at. Find the size of your aquarium in the left hand table column and move to the column that shows the number of degrees the aquarium needs to be heated. If the heating requirement is between levels, move up to the next larger size heater.

In larger aquariums or where the room temperature is significantly below the desired water temperature, two heaters may be required. If this is the case, install the heaters at opposite ends of the aquarium to heat it more evenly.

Heater size guide

Gallons/litres

5oC/9oF

10oC/18oF

15oC/27oF

5 gal/25L

25 watt

50 watt

75 watt

10 gal/50L

50 watt

75 watt

75 watt

20 gal/75L

50 watt

75 watt

150 watt

25 gal/100L

75 watt

100 watt

200 watt

40 gal/150L

100 watt

150 watt

300 watt

50 gal/200L

150 watt

200 watt

2x200 watt

65 gal/250L

200 watt

250 watt

2x250 watt

75 gal/300L

250 watt

300 watt

2x300 watt

Example

 
Average room temperature = 15 degrees C

Desired water temperature = 25 degrees C

Heating required = 10 degrees C

Tank size = 100 litres

Heater size = 100 watts

Aquarium scene

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