Nothing wrong with a boiler, I think a few people use them here.. I wouldn't ferment in one..especially if it got cold in the outhouse.. can you imagine the electricity bill you might accumilate over time.?
I am not sure I would trust the hot spot of that either and how would you know that hot spot is providing an accurate 20úc throughout.. Further more I wouldn't want all that trub and yeast cake sat on my element for that time...
I am sure people probably do it but I think it is a bad choice.. I would transfer it to a fermenter and find another way to insulate it or regulate the temp.
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