Aquarium Co-Op Heater

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  • 1-year Aquarium Co-Op warranty
  • Built-in heater guard 
  • Extra-long, 11.8-foot cord

The Aquarium Co-Op heater comes in two sizes — 50 watt and 100 watt. It is reliable, accurate, and thoughtfully designed to avoid some of the problems we encounter with many other heater brands on the market. If you do run into a problem, Aquarium Co-Op provides a 1-year, hassle-free warranty on this heater.

This compact heater is easy to position within the aquarium and has a built-in heater guard to protect the unit from damage. You can quickly adjust the temperature without getting your hands wet, since the adjustable temperature controller is located in the middle of the power cord and sits outside the aquarium. Plus, the cord itself is extra long and extends 11.8 feet, so reaching the outlet is much easier compared to many other heaters. (The cord length between the heater and controller is 4 feet.)

The heater is intended for indoor use only, so please make sure the tank water is around room temperature before plugging it in.

Note: When you first plug in the heater, a yellow indicator light will briefly turn on and then turn off again. The yellow light will turn on again once the unit has run for 17,520 hours, which is 2 years of being plugged in full time. At this point, the heater will still continue to work, but the yellow light reminds you that it has reached the end of its expected life and it may be time to start thinking about replacing the unit to ensure the highest performance. The red indicator light turns on whenever the heater is actively heating the water, and the temperature display is always on to show the current water temperature.

Download the Manual

Customer Reviews

Based on 485 reviews
jacob e. (Wilkes-Barre, PA, US)
Great Heater

I bought this heater to test out. I have to say so far it has not let me down. I have used multiple brands of the tube style heaters and was a little skeptical about this one. I trust that it would work but was not too sure about how it would look. Have to say that I do not mind it at all. It is nice to be able to glance over and see the temp of the water. Will be getting another one in my next order.

BRIAN H. (Bethlehem, PA, US)
Hands down the best Heater!!

Looks so good in the tank. You can clearly see your water temperature. Cool design. Honestly my new favorite product from Aquarium COOP!! About to order another. Like many others have said please come out with a bigger one!! at least 200 W.

Steven T. (Arlington, WA, US)
co-op heater

I love it! My only complaint is that I wish you had a bigger model as well.

Scott B. (Charlotte, NC, US)

Awesome heater love the fact that don't have to wonder. What the temp is so satisfying.

Holly H. (Oxford, MI, US)
Awesome heaters

I love the electronic reading in the tank and that I can set it using the control outside of the tank. I always know what the temp is. I inadvertantly bought the 50 watt, but it has no issues keeping a 40 breeder at a stable temperature. I was a little concerned about the design with fry in the tank, but I have swordtail fry and peacock gudgeon fry with no problems.