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Just an update: The Tetra HT30 100W submersible heater rated for 10-30 gallon aquariums has heated my 5 gallon tank to about 76 degrees after 48 hours. I guess that will be good enough, not great. Thank you all for your advice.

Thanks everyone~ Oooh, I don't know anything about whether or not the main electrical panel wired with a gfci. I just bought another Tetra submersible, but one rated for up to 30 gallon tank for my 5 gallon tank. The pet stores I visited today did not have adjustable heaters. I hope this one...

Malisa_, DavidAl, MartyA, Betagal, Yes, I have tried several outlets. I trust my thermometer as I have tested it by other means. I have never turned one on outside the water. I have tried them in buckets with cold water to see if they make the water heat up all. These are all one-setting...

Thanks for the suggestion but I have tried that one!

Hi all, I just started my first freshwater (5 gallon) aquarium. I have tried 5 different heaters in the last week and none of them has worked! The 1st one I tried worked for 3 days. I realize this suggests user error, but all you have to do is place them in the tank and plug them in, right...