Tom G Posted March 5, 2021 Share Posted March 5, 2021 Today I installed a Fluval 300W E Series in my 75 gal tank. Tank is in my basement where room temp is about 67 degrees. I set the heater to 81 degrees and water temp never rose above 77 degrees, all day. I researched this heater a bit and discovered it can’t heat water more than 10 degrees warmer than the ambient room temp. See video about 2 minutes in. Am I understanding this correctly? This seems amazing to me. I have an old Marineland heater and it’ll warm that water to anything I choose, it doesn’t care what the room temp is and nor should it! Link to comment Share on other sites More sharing options...
mustang_eas Posted March 5, 2021 Share Posted March 5, 2021 Yup that's correct for whatever reason, I had the same heater in the same size tank, ended up running a second heater for discus I kept at 84' you'd think for the price that wouldn't be the case. Link to comment Share on other sites More sharing options...
mustang_eas Posted March 5, 2021 Share Posted March 5, 2021 I found the M series heaters worked better at heating but I switched to the E-series because I liked the temp to be displayed. Link to comment Share on other sites More sharing options...
Brian Posted March 5, 2021 Share Posted March 5, 2021 This is funny-not funny. I two purchased this same heater, in fact two of them for a 125 gallon Discus tank. Tank is located in basement/family room. Temperature here is about 69-70. Those two heaters struggled to get my tank to 82-84 degrees. I would look over and see one or both with that blue display. I replaced one with Eheim Jager 250W. Problem solved. little disappointed.. Link to comment Share on other sites More sharing options...
Maggie Posted March 5, 2021 Share Posted March 5, 2021 Yes, the Aqueon heaters say the same thing - my house is 68-72 and the tank never got above 76. I bought a larger adjustable Fluval heater as I'm soon getting a couple residents soon that prefer around 80. Link to comment Share on other sites More sharing options...
Daniel Posted March 5, 2021 Share Posted March 5, 2021 There could be an upside here. At least it will not cook your fish when it fails.🙂 Link to comment Share on other sites More sharing options...
Tom G Posted March 5, 2021 Author Share Posted March 5, 2021 Yep no chance of cooking fish if it fails to even heat the tank. a Fluval rep told me this that the heater failing to get to temp is what’s supposed to happen. Said solution was to buy a second heater or heat my basement. Unbelievable. Link to comment Share on other sites More sharing options...
Frank Posted March 6, 2021 Share Posted March 6, 2021 2 hours ago, Tom G said: Yep no chance of cooking fish if it fails to even heat the tank. a Fluval rep told me this that the heater failing to get to temp is what’s supposed to happen. Said solution was to buy a second heater or heat my basement. Unbelievable. What they're telling you is just a fact about modern times. You, and some few of us, might pay $30 for a reliable heater, but the vast majority would rather pay $15 and forget about it. Link to comment Share on other sites More sharing options...
Eric R Posted March 6, 2021 Share Posted March 6, 2021 Dunno about you, but I spend $40 on the heater and then another $30 on a controller, because I don't believe that you can 100% trust any heater these days. Also to the OP, sometimes two heaters on a tank can be good. If one fails, your tank won't end up completely unheated. And as @Daniel said, if they fail on, they won't be able to cook your tank. Or better, you could run two heaters with a temperature controller with two probes and two set points. Link to comment Share on other sites More sharing options...
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