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 520 reviews
M.K.B. (Pensacola, FL, US)
Heats my 75g

This heater works great on my 75g. I'm in Florida so we keep the house at 73... But the other heater I had could not keep both sides of the tank at the same temp. This one does

Ian G. (Santa Rosa Beach, FL, US)

Awesome product!!

Alana B. (St. Petersburg, FL, US)
Works as it should

No problems at all. All features are working and it's doing its job.

Don W.
Finally an Aquaruim Heater for the Aquarist

The Co-op's new aquarium heaters are simple and work great. After 65 years in the hobby I've learned a few lessons on aquarium heaters. I can tell that the Co-op heaters are different because an Aquarist designed and tested them. The first thing is it's nice to see the tank temperature from across the room. Especially from across the room and especially if you are running a lot of tanks. I don't have to get wet any more to adjust the thermostat. I appreciate the operating hour amber warning light. Thats extremely useful feature to me. If I'd had Co-op heater like this back in the day perhaps my PTSD about discus wouldn't have happened.

Jeffrey C. (Moreno Valley, CA, US)
I love it

First of all I like how it looks. Not the common heater that’s cylindrical. And then the big digital reading is a huge feature. I wish I knew this before I bought 3 other heaters I have for my other tanks.