Imo heaters should be replaced every year or 2. They're cheap compared to the rest of our setups, and a faulty one is the number 1 cause of tank crashes. 50 bucks is worth it for my peace of mind. I do have an inkbird on every tank though.A pair of brs titanium heaters on a inkbird controller. Had them since 2020 and still going strong but make me nervous lol