Aquarium Heater Wattage Calculator
Recommend heater wattage based on tank volume and desired temperature rise above room.
Recommended heater
60–100 W
For safety, split into two smaller heaters if over 200 W.
Examples
- 20 gal, 68 °F room75–100 W heater
- 75 gal, 65 °F room300 W (or 2× 150 W)