Anyone know of an electric heater with a credit card/bitcoin slot and…

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Anyone know of an electric heater with a credit card/bitcoin slot and display? What I'm envisioning is something that shows you how much it would cost to operate it each hour of the day. You plugin the hours you want, it turns on during those hours. Once it's depleted its reserves, you have to refill it.

Context: the Airbnb I manage had a shockingly high heating bill in December. However, turn down the heat, and the guests complain (since they pay a fixed fee regardless, they aren't incentivized to conserve). Would like to align guests incentives with ours.