US & English/European heating systems.

[Findm-Keepm]

Originally Posted by dieseljeep

Regarding non-vented kerosene heaters, in some states, they're illegal and not to be sold. Of course, with the internet sales, it's hard to prevent.

And some ventless gas heaters are the same way - illegal to install/sell in certain jurisdictions. I use a 18K BTU one with two windows cracked open for cross-flow ventilation, and I shut it down at night, even securing the gas feed line for additional safety. I gotta get a CO monitor before I use it again. I can see why they are dangerous - so many don't take the extra precautions.