Do you use unvented portable Kerosene heaters? I have used Toyostove Kerosene oven for many years to supply extra...

I have used Toyostove Kerosene oven for many years to supply extra grill in the winter. I simply wouldn't ever want to be in need it because of the wonderful heat it give. It cuts my house heat within half respectively year. I was wondering how prevalent they are and how plentiful other people use them as a ability of supplementary heat, or emergency warmth if the power goes out. Do you own and use one? Do you close to it? does it save on your heat bills as it does on mine? Just wondering.
Answers:    Beware of carbon monoxide. Anything that burns fuel emits fumes that can take out you. Every winter I read about death from kerosene heaters so please be careful. . .
Yes I use one but merely if we lose power. I'd be lost without it. We did use one on a regular starting place years ago but It urned my ceilings adjectives yellow so didn't use it as much after that.