Heater suddenly gets way too hot...Defective? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 6 Old 04-12-2011, 10:58 PM Thread Starter
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Exclamation Heater suddenly gets way too hot...Defective?

So I got a fully submersible heater (Aquaclear 20) that came with the tank set up for a 20 gallon and I've had the tank running for about 5 weeks now and I've never had a problem with the heater, never drained the water past the safety line or hit it or anything like that. I've had it set to 75 and it was perfect and has always stayed at that temperature.

Well the other morning I opened the cover to feed the fish and I felt this intense heat come out of it. I looked at the thermometer and it was 86! I got scared and quickly unplugged the heater. I read somewhere that the thermostat can get stuck in the "on" position. Is this true? I plugged the heater back in eventually and for one day it was right at 75 as it should be. Now tonight, a day later, it's creeping right back up into the 80s so I unplugged it again. Is this a common thing with heaters or is mine just a cheap model or defective?

Also, since day one I noticed there have been moisture droplets, almost like condensation inside the heater like where the pilot light is and I'm just now starting to connect the two. I don't know if this condensation inside the glass is normal.Thanks

Last edited by whitecloud34; 04-12-2011 at 11:16 PM.
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post #2 of 6 Old 04-13-2011, 04:26 AM
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Sounds like the thermostat inside the heater is faulty. Hopefully you can get your money back.

Good luck.

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post #3 of 6 Old 04-13-2011, 07:28 AM
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I agree with Romad completely! A faulty heater is not worth fooling with!. Get a new one S.A.P.

When looking for a solution to an Aquarium problem go slow and change only one parameter at a time!
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post #4 of 6 Old 04-13-2011, 10:47 AM
Yep...The first sign of heater trouble not related to tweaking the settings to dial-in desired temperature, the heater MUST be replaced - no second chances to kill your stock.
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post #5 of 6 Old 04-13-2011, 11:20 AM Thread Starter
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Thanks guys. Yeah I took the heater out last night and I'm going to pick up a new one as soon as I can. I'm not taking any more chances. Luckily I saved the package it came in. Thank you for your replies.
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post #6 of 6 Old 04-13-2011, 11:50 AM Thread Starter
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What is a good heater to get? I want to make sure I get a good quality one this time. I am interested in a glass-less one I think by Marineland and it's all black and indestructable. Would anyone recommend this? Thanks!
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