For normal room temperatures, figure on 100 watts for a 20-gallon, 175 watts for a 55-gallon, and 300 watts for a 100-gallon. If the room gets quite cold, use higher wattages. The water temperature should be stable. Notice that the smaller the tank, the more watts per gallon are needed.
Compare Similar Items. Eheim Thermocontrol Aquarium Water Temperature Controller, 125-watt.is this compatible with a 20 gallon tank? I recently upgraded from a 10 gallon and the heater I currently have can't keep my 20 gallon heated enough. Answer by.

Estimate aquarium heater wattage for a 20 gallon tank based on room temperature and target water temperature.Who this guide is for. This guide targets common 20 gallon aquariums where heater sizing depends on temperature rise, not just gallons. What to compare.

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A 20 gallon aquarium should be heated with a 25 watt heater. This size of heater is usually available in both submersible and hanging models, so you can choose the one that best suits your needs. The temperature of the tank water should be kept between 73-82 F (23-28C).
Mini Heater 100W for 5-20 Gallons auomii 100W small size aquarium heater is suitable for 5~20 gallon mini fish tanks, and easy to hide in the tank. Temperature can be accurately adjusted from 64~93F. This heater suitable for both saltwater and freshwater.