An eletric heater powered by an old #bitcoin miner, with a meshtastic node embedded in it. It uses #meshtastic to bounce data to a gateway to submit PoW. By default, that could go to the person who built the heater.

The user just plugs in the heater without ever having to deal with any of this, nor connecting their electric heater to their wifi. Then they get a small check in the mail each year for running their heater.

If the customer is technically savvy and interested in obtaining bitcoin, they could reconfigure the heater to mine for them.