What I do is use a space heater, one of those 1500 Watts doohickeys that plug into the wall and blow hot air. I have it facing the (unplugged) fridge with something jammed into the freezer door part to keep the freezer open. The ice will melt within three hours or so. (Unless you forget to unplug the fridge. Been there did that. It was a GFCI plug, I thought I had turned it off. Hahaha. Nope.) Anyway, spaceheater, two feet away, ain't gonna melt nothing. Gotta be pressed up against the fridge for it to melt stuff, and even then space heater usually has a safety turn-off mechanism. Takes all the fun out of fire risk.