Below is a great guide for the approximate sizing of heater Wattage to aquarium size. The CHANGE IN TEMP is for the required maintenance of temperatures above the ambient room temperature.
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Aquarium Heater Size Guide |
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Tank Size |
Change Temp 5C | Change Temp 10C | Change Temp 15C |
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20 L |
25 W | 50 W | 75 W |
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40 L |
50 W | 75 W |
75 W |
|
75 L |
50 W | 75 W |
150 W |
|
100 L |
75 W | 100 W |
200 W |
| 150 L | 100 W | 150 W |
300 W |
| 200 L | 150 W | 200 W |
2 X 200 W |
| 250 L | 200 W | 250 W |
2 X 250 W |
| 300 L | 250 W | 300 W |
2 X 300 W |
