This is a really, really bad idea. Please do not do this. A quick search online will give you tons of results about potential fires and carbon monoxide poisoning.
https://ota.dc.gov/release/dangers-using-your-stove-home-hea...
https://ota.dc.gov/release/dangers-using-your-stove-home-hea...
I agree, it was a really bad idea, but better than letting the pipes freeze.