I also ran the numbers. I will only make a little and I'd the price drops, I will be in the red, but I would rather spend a $3,000 on a heater that pays me sats than $8,000 on a heater that pays no sats.

I either need to sell 13 million sats to buy a normie heater or finance it at 12.9% interest. 

This option was less attractive when I could get 0% interest loans, but the tides have turned.