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I have two Hydor ETH 200’s. Both hooked up to Ehiem 2215’s. One is on a 55 gallon and the other on a 30 gallon. I can’t tell you how good the thermostats are, because I have them hooked up to temperature controllers. But, I can tell you they both do a fine job of holding the tank temperature where I want it.
 

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I have a ETH-200 inline on a Eheim 2217 on my 55gal and a ETH300 inline on a Eheim 2217 (soon to be inline on my FX5, have the parts just have to make it happen :D ) on my 90 gal. On my 90 gal. im also using a Hydor Hydroset digi thermostat to control the ETH300.

They work great so far but *** only had them for a few months.
 

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I have an ETH 300 on my Fluval 405 outlet. Works great. Temp is rock steady and it actually matches what is on the dial! (there's a nice bonus!!! haha)
 
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