Hydor ETH External Thermal Heater In Line Heater

I have a 300 watt on the return line on my 80 and a 200 watt on my 37 gal reef. Both heaters work flawlessly and keep the clutter our of the tank or sump.

What more is there? It is easily hidden, and it maintains steady water temps. Easily some of the best money spent on this hobby.

If you use canister filters, stop reading this review and ORDER this heater. You will be amazed at how easy it is to install and how GREAT it is when you don't have to look at ugly submersible heaters. I removed FOUR submersibles from my 125 gallon tank and installed two of the 300 watt models and they immediately got my temp up to the desired level and is keeping it there. I wish I had known about these sooner and I believe they are the only heater that anyone with a canister filter should consider.

Arrived quickly and in great conditions. Set up and running for about a week now with no issues and constantly keeps temp in check. Best heater I've used as water is forced passed the heating element to constantly regulate and measure temp.

I've had this heater for over a year and it works great. Fit perfect with my magnum350. Even temp all the time.

I love this inline heater. No leaks at all in the connections. It is keeping the water at the right temp, and best of all, it is not in the tank.

I bought the Hydor 300-watt inline heater for my 65-gallon Discus tank. Installation was a breeze since the 5/8" barbed connectors fit the 5/8" return line from my Hydor 350 canister filter perfectly. I set the temperature dial to 85-degrees F and plugged in the heater. Several hours later, the water temperature in my tank was exactly 85-degrees. I've been running the heater for a month now, and so far it's working flawlessly. No leaks, burned fish, or clutter in the tank. If you have a smaller tank, then the 200-watt version is more than sufficient. Note that the 200-watt version is available with either 5/8" ID fittings or 1/2" ID fittings (not being sold here), so check your hose size. Highly recommended.

Works perfectly. Ordered 2, hooked up to my Fluval G3 and G6 filters with no issues.

It keeps the temps steady and consistent for my 70. Have had it running for over a month now. Keeping a eye on it in case, as another reviewer stated, so it doesn't "cook" my fish. Any heater has the potential to do this IMHO. So far so good. I had a sump with a 200 watt heater. Never seemed to be able to keep the tank consistent. Perhaps it was under powered (my fault). The sump is gone had other issues/problems. That's why I got the inline heater.

I have had this heater for about 1 1/2 years and little maintenance has been done to the inside - yet the temp stays WITHIN .2 of selected temp. It is AMAZING.. You hide it under the tank and connect it to the outflow of your canister filter (or pump) and set temp. Done. The only thing you hear is the relay clicking on and off as it heats or stops. The only way they could improve it is to make it a digital readout rather than the dial - still, I have these for my 55, and 4 others, no issues - EVER. Worth the cost when you want to hide as much "gear" and focus on the tank instead.