I've also had brand new heaters fail - hard to blame it on being used IMO.
Heating the room is less risky overall, but doesn't work in all cases.
For my soon-to-be big show tank, I went with a Ranco ETC temperature controller instead of relying on the relatively cheap fish heater internal controllers. It had a relay to switch on and off the heaters plugged into it. In the event it fails off, hopefully I notice the tank going cold and fish getting sluggish. In the event it fails on, the individual heaters are going to be set for ~5F above my desired temperature, so if they are still working, they'll turn off on their own before they cook the fish. If one heater does fail on, having needed a set of heaters to heat the tank, hopefully it's incapable of being able to cook the tank itself. Just something to think about for your 265 perhaps.