The new gas system works great, heats quickly and seems very efficient. However, there is a strong smell that comes every time we turn up the heat. It smells like some kind of oil. Had the installer come back, says its not dangerous, that it is from the lubricant used between pipe joints. Looks like there is a lot of excess putty like substance around the joints, that seems to be where the smell is coming from. Is it safe to clean the excess without compromising the functioning of the unit? The smell is causing headaches, sore throats and irritated eyes.

  • Seems like that should be installers job. If your new system causing such discomfort than something is not right
    – Vitaliy
    Dec 27, 2011 at 0:36
  • Does it smell if you turn on the blower without the heat? Jan 3, 2012 at 18:24
  • Check the pvc coming from the hot water tank it's most likely leaking co2 into the heating vents
    – user51547
    Mar 17, 2016 at 4:33

1 Answer 1


Your question concerns me. I'm a general contractor and have had many new heating systems installed for customers and have NEVER had this complaint from anyone. As a matter of fact, I just had a complete change over from oil to natural gas done at my private home two weeks ago. I have never smelled any residue from cutting oil used to thread pipe. My sub contractor is very conscientious about cleaning all excess oils and pipe joint compounds. Also, before any gas can be turned on, an extensive test of pressure and inspection of all black pipe and outlet fittings is done. There is absolutely no reason to have any fumes.

The other reason for my concern is that you smell this when you call for heat. My first concern is that you may be getting some exhaust or carbon monoxide leakage. Do you have CO and explosive gas detectors installed? If not, get them installed immediately! If your contractor won't take your complaints seriously, then call the gas utility and ask them to check it out. Tell them you suspect a leak, and they will be there in a heart beat!

I should ask, what kind of furnace unit/heater are we talking about? Vented, unvented? Give us a bit more info and maybe we can narrow down the possibilities.

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