Originally Posted by eryk4381
So you have seen something like this before then???
I only have a 75 watt infrared bulb in there.
I did appliance repair for over 30 years. Yes, I have. 75 isn't too bad but I wouldn't go over a day without checking it to be safe. It all depends on application and temperature extremes. I have an old heating pad I use. It takes a couple days sometimes to get up to temp in the winter but it works. In my application, in my basement refrigerator fermentation chamber I'd be comfortable that 25 watts is enough. The small space heaters are overkill at 200 watts but at least come with their own thermostats as a backup.
In my cases the damage is 'usually' confined to the area of the light bulb. There was also some wall melting in some of the older freezers from the icemakers. Just point the 75 watt bulb away from surfaces.
Keep in mind the units I worked on were actively trying to cool which helped.