Sorry. I’m not doing a good job with this. Let me rest.
If you are looking for heater first, but also mines. Check out that Avalon mini3 from Canaan. That’s really all you would need. Pull it out of the box and plug it in (110v)
If you wanted more DYI. You would buy a real miner. Like a S19 or S21 And replace fans. Run Ethernet. And a 220v power. And have to do ducting and such.
The link I sent is the quick easy route.