Hydor ETH 200 In-Line External Heater 200w 1/2" hose

This is the best heater for any tank (sized appropriatly) using a canister filter. Simply split the return line and install the heater. No extra equipment in the tank, no electrical connections in the tank. I noticed some reviewers are complaining of fittings being too small. Pay attention to what you are ordering! There are two diferent 200 watt models; one with 1/2" (12mm) fittings and one with 5/8" (16mm) fittings (all measurements are for inner diamenter). My canister uses 1/2" line so the 1/2" fittings work perfectly. I imagine the same thing is true for the 5/8" model.

Stopped working after about 8 months. Temp in tank dropped 12 degrees to room temperature. Took me a couple days to get a new one, so thats a couple days my fish were too cold and unhealthy.

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I recently set up a 25 gallon rimless cube tank. I wanted to minimize what was hanging on the outside of the tank so I purchased this Hydor. After a long search it seemed Hydor was the only game in town for a inline heater. Well, it's great! Takes a few minutes to connect and that's it. No leaks, no fluctuations. I have it connected to my Eheim Ecco. Working for a month now in an unheated room and it is dead accurate and does not fluctuate. As some others noted it does make an audible click when it turns on but mine is inside a cabinet so it really is barely noticeable. Less than the click of a pen. And if it wasn't for that I'd have to check to even see if it's on.

Great product, stop looking this is it.

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Have had the heater for almost a year now, and so far it works great for my 40 gallon tank. Only complaint is that it turns on and off very frequently (about every 2 minutes) with an audible click that can be quite a nuisance. Also, its exquisite sensitivity, which makes it turn on and off so frequently, makes me worry that it might wear out before long.

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I have gone through 3 of these heaters in the last few years. I was attracted to the design, and Hydor is about the only company making inline heaters.

Unfortunately I had all three fail. Two failed silently (stopped working, temp dropped on the tank) and the last one failed catastrophically and cooked everything in the tank.

Since I don't want to lose all my fish and shrimp again, I have gone back to the Eheim Ebo Jager in tank heaters. I have never had a problem with them. The only reason I changed was the slick design of the Hydors.

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