I purchased an Aqueon Submersible Aquarium Heater 100 Watt. Well it had always kept my twater temp about 78 degrees. (And when I say about I have an electronic thermometer that always read 78.2 to maybe 78.6) Yesterday I noticed the temp was 77. So I kept an eye on it and at one point it did get back up to 78 (I never adjusted the temp on the heater) and today it's back at 77. Today I heard this horrible very faint high pitched squeal (hum?) and was trying to figure out if it was the filter. The heater and the output are pretty close on the same side so I put my ear right on the glas of the tank by the heater and knew it was the heater. So I unplugged the heater and the noise stopped. Uggggh. I hope it didn't cause any electrical shocks in the water! I put my hand in the water when it was on to feel the temp and didn't feel anything noticeable.
I found my receipt. I purchased the heater from petco 12/8/14 and today is 2/8/15 and petco has a 60 day return policy. I'm about to return it but I need to get a new heater today but I'm not sure if I want to get the same one after what happened. I also have a petsmart nearby and am wondering if anyone has any reccomendations for heaters I could find at either of these places?