OK....how many square feet do you heat with it? A 250 watt draw....hmmmmm.
Costs to buy?
Your electric rate?
If it works and make you warm and happy, it's a Killer thing to have.
Remember those ceramic disk heaters back in the 80's? $99.99 I think. They were everywhere......3 or 4 per household.
I started burning coal in 1972, I had enough of OPEC by then. I wish you well with this piece of future history!