Natural Gas Space Heaters

[Michael R.]

I am looking at a rehab in the hood and it does not have a furnace or any duct work. It has natural gas connections in most of the rooms. The seller said that space heaters get mounted on the wall and connected to the natural gas. I have never seen this before and I like it because if I have a vacancy I can pull the heaters and they wont get stolen. Plus I can get and install them for really cheap. I am nervous that they dont vent to the exterior and I know they can be a fire hazard if not used correctly. However this seems to be how the house was built. Dont think I could install a furnace and ducts in this house. Any one have experience with these? Are my worries justified?