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That's it! My probe is far from the heater. It's heating the water very close to the thermostat to the proper temp and shutting off, but by the time it mixes with the surrounding water the overall temp ends up being lower if the ambient environment is cooler. I'll experiment with some...

@Colin_T, thank you very much for the awesome, detailed response. That all makes sense, and I'm glad you included the info about the better brands, since I'll likely be looking for one of those. The only thing that perplexes me though, is that between around 1am and 6am during my test session...

Hello, I have a question about heaters and am hoping someone who understands the internals can help. I have a very modest/small tank (20 gallon long). It had a simple, cheap 100W heater, probably made in China but I'm not certain. Since I always feared that someday it would fail without my...