What cryptocurrency excavator to heat in winter?

I'm not trolling, I'm seriously asking. Let's start with the fact that I know very little about crypto. So I would be interested in the “switch on and forget” solution. The neighbor has a cryptocurrency miner (ETH). It heats the room (nearly 200 m2) amazingly. Now in the summer, when I have 23 degrees Celsius, I have 28 degrees Celsius. A neighbor says that he earns something there - much less than before, but what he earns covers his electricity costs. Because I'm getting ready to spend 4-5 thousand a month in winter. PLN for the heating itself, I thought that maybe I would start my own cryptocurrency excavator, which would heat my air, and at the same time earn for myself - it would be great if the revenues from what I excavated would cover the costs of electricity. So what do you recommend? What solutions? How many years does such a cryptocurrency excavator 'wear out'? At the moment, I can afford to spend up to 20,000. PLN net. Is it possible to work with such a budget?