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Frequently Bought Together
Product Features
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Product Details
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Product Description
ETH Heaters are the first external heaters for aquariums with the exclusive PTC technology. The self-limiting PTC heating element guarantees maximum safety against any risk of overheating. Designed to be used on return lines coming from canister filters or sumps.
Customer Reviews
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Most Helpful Customer Reviews
10 of 10 people found the following review helpful:
5.0 out of 5 stars
Best Heater Period,
This review is from: Hydor ETH 300 In-Line Heater UL 300W f/16mm & 5/8" Hose (Misc.)
I am a long time fish keeper now specializing in discus. I have owned just about every brand of heater in my over thirty years in the hobby. No heater I have even owned is comparable to this one. It is quite simply far better than any other aquarium heater. Easy to set, accurate, holds temperatures extremely stable. It must be used with a canister filter which I notice the Informational Blurb does not include, but if you run a canister filter on your aquarium this is the one to own.
5 of 6 people found the following review helpful:
2.0 out of 5 stars
Wonderful heater,
By ExE122 (Baltimore, MD) - See all my reviews
Amazon Verified Purchase(What's this?)
This review is from: Hydor ETH 300 In-Line Heater UL 300W f/16mm & 5/8" Hose (Misc.)
I purchased this to replace a submersible heater that was overheating the tank despite the lowest setting. Right away, I could tell that the Hydor was well constructed and made from much better materials than any other heater I have ever used. The installation instructions were a bit vague, but its not a very complicated system. Once I got it going, I was very impressed! It does keep the temperature very even and consistent according to the setting. It's also nice since its hidden away behind the stand completely out of sight. One less piece of equipment in the tank! Well worth the extra price.*UPDATE - Demoted this to two stars. It had been keeping temperature pretty consistent for weeks, but today I went down to find all my fish were dead. The temperature had gone up to 102 degrees without warning. I checked the heater and the setting hadn't changed. I'm checking to see what kind of warranty is offered! *UPDATE - Hydor did honor the warranty and replace this product. Unfortunately, I noticed a temperature spike once again with the replacement. This time I did manage to catch it before it killed any more fish. While this item heats very well, the thermostat is COMPLETELY useless and unreliable. One commenter on this review suggested using a separate thermostat (Hydroset was the recommendation) which I think is exactly what I need.
2 of 2 people found the following review helpful:
5.0 out of 5 stars
Works great,
By
Amazon Verified Purchase(What's this?)
This review is from: Hydor ETH 300 In-Line Heater UL 300W f/16mm & 5/8" Hose (Misc.)
This ETH-300 has been working great for almost a year now. I have it hooked up to the Hydroset thermostat in my 90g male Peacock Cichlid tank. Its plumped inline to my Fluval FX5 using some 1" x 5/8" barbs. It keeps my tanks temp steady at 79°, every once in a while I'll set it to 80°. I love the digital display. Nothing else to say...it works and works well. Just make sure you get a thermostat to hook the heater up to just just as added protection in case of a heater failure.
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