Hi there, I see you are looking for a heater? I have been looking for good heaters for a long time and my top recommendation is the Eheim Jager Thermostat heater series (click here to see it on Amazon). I will explain why.
Quality and Reliability
The reason that I recommend the Eheim Jager series as an aquarium heater is because Eheim is a reputable brand from Germany that have been making good products for a long time.
You want your heater to be reliable and trustworthy, as there are too many stories out there where the heater malfunctioned and overheated the aquarium. Therefore I always would steer away from cheap off-brand heaters, even when they might look like a super deal.
What Size Heater For Your Aquarium
Choosing the right size of heater is important, because you want your heater to be able to warm up your aquarium to the desired temperature. For an average temperature (nothing too warm or too cold) the following table I made show the right wattage for the right size of tank.
| Fish Tank Size in Gallon | Fish Tank Size in Liter | Wattage of Heater |
| < 5 Gallon | 20 – 25 Liter | 25 Watts |
| 5 – 15 Gallon | 25 – 60 Liter | 50 Watts |
| 15 – 40 Gallon | 60 – 150 Liter | 75 Watts |
| 40 – 50 Gallon | 150 – 200 Liter | 125 Watts |
| 50 – 80 Gallon | 200 – 300 Liter | 150 Watts |
| 80 – 100 Gallon | 300 – 400 Liter | 200 Watts |
| 100 – 150 Gallon | 400 – 600 Liter | 250 Watts |
| 150 – 250 Gallon | 600 – 1000 Liter | 300 Watts |
Setting Up Your Heater
To set up the heater, I followed a video guide made by the YouTube channel called “Big Al’s” that makes a lot of videos on the Aquarium Hobby. I will advice you to go and watch that video to learn to set up and calibrate your heater.