I've been using Visi-Therm heaters for almost 10 years with no trouble. The only bad experience I had with one was actually self-inflicted. It seems I got distracted in the middle of a large water change that had left the heater out of the water. I never unplugged the heater, and 20 minutes or so after I siphoned out the old water, I went to pour the new water in and the heater exploded.
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