I would say get a Bitmain s9 ($250-350 on eBay )and run it at 700-900W. Does about the same amount of heat and power consumption as a standard space heater.
You If you want it to to look fancy you can throw it in one of these from CryptoCloaks (npub1lrj…zvrj) https://www.cryptocloaks.com/product/s9-space-heater-case-bitcoin/
