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.
Aquarium Heater Size Guide |
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Tank Size |
Change Temp 5C | Change Temp 10C | Change Temp 15C |
20 L |
25 W | 50 W | 75 W |
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 |