I am using this heater on 5 tanks and keep 1 or 2 on hand for backup seem to maintain consistent temperature

I purchased 3 of these and 2 of them have had trouble. They are a nice design with No worries of breaking glass. Easy to set the temp using a turn style knob with visible temp scale. Now my issues: I had one set up on a hospital tank which ran for months without issue. It was set for 80, then one day, I assume, the heater got stuck on, sending the tank to 94 F killing a tang. Another one of the heaters was in my display tank. It has been working perfectly for 1.5 years and then.... it split down the side exposing its "guts" in a 1.5 inch split. I found out because I was going to frag and when I put my hand in the water I got shocked due to the heater core exposed to the water. I have no idea how it happened as the heater has been in the same spot untouched. I do like the durability and price, but have had too many issues. I would only get on to use in heating water change salt water. Spend a bit more and get the titanium ones for your display tank/tank with fish or corals.

It is doing its job so far. I like that it doesn't have a glass exterior and is less likely to break if dropped.