Kerosene is fine if it's burning well. I've got several. One for the garage, two for the living room and a 4th that needs work. I haven't used the one in the uninsulated garage in sub-freezing weather yet, so I'm not sure how effective it is.
I've got a CO detector that shows me the level in PPM, and I try to keep it under 15. My newest old heater doesn't even register.
Maybe you were thinking of the salamander style heaters? Mine all use wicks.








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