I've been waiting for that toaster mining for 6 years already...
Stove, oven, no, heating your house or maybe a water heater that can be done, the problem is the chip costs when a water heater cost 200 euros and the miner 10 000 and the other is that you don't need constant heat. Buying a 15k mining oven that will run only 30 minutes a day and make you 100$ a month is .....childish let's say.
Lovely, a mining toaster! Jokes aside, no need to have $10K mining hardware, I bought my Cyrix@233 MHz with 32M RAM and 3.2GB HDD back in the day for a big bag of money and it was a low end PC, now you can get a cheap PC for 50$. Prices of the electronics are going down (except now with this shortage of chips) so sooner or later there will be cheap mining devices on a single chip, included those in our day life devices, imagine higher hash power will less electricity consumption, that will be highly efficient devices.. making the bitcoin network highly decentralized and still making you some satoshi (better than nothing). Future is bright I might be a shitty visionary but I have the feeling I'm right on this one