Wood Heat Stoves said:the simple magnet types have been known to demagnetize and fall off hot pipe to melt carpet--fix:use the supplied screw
Every time my single-wall flue pipe hits 800ºF, the thermometer slides all the way down to the flue collar on the stove. It has actually left a trail along the pipe from repeated transgressions. I'd fix it by wiring it in place with the wire that was packaged with it, but I've come to rely on the sound of the thermometer sliding to get me to jump up and shut the air down.