It's possible the OP subscribes to the same theory on heaters that I do.
On my large tank I run two smaller heaters as opposed to one big heater. If one heater fails in the on position the other shuts off and I have a much better chance of catching it before my fish are cooked.
On my large tank I run two smaller heaters as opposed to one big heater. If one heater fails in the on position the other shuts off and I have a much better chance of catching it before my fish are cooked.