Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit

Bedroom radiator emits strong smell

John94John94 Member Posts: 2
Greetings everyone,

I live in a small building. My unit has 1 bedroom. The bedroom radiator has been inoperable for over 10 years. The living room rad has operated just fine in that time. It is a cast iron base board radiator powered by hot water. Not steam.

This past summer a plumber was dispatched and he was able to turn on the bedroom radiator. This fixed the issue regarding not having heat. In the fall it began to radiate heat. There was no smell at that time. Very briefly for one day or so a faint smell was there. But it went away immediately.

Since the real cold began in December. The bedroom radiator emits a very strong odor. I contacted the plumber who got the rad working. He advised me to use compressed air. Or to let it burn through whatever had accumulated for 10 years of not functioning.

After 4 weeks. Where the smell did not get any less intense. I used a compressor and blew out that radiator. When I started forcing air through it. Silver foil and also black backing paper which was situated behind the silver foil started to come out. I also forced 2 large clouds of dust out on both ends of the rad.

After that one session. The smell became somewhat less in concentration. I decided to blow out the rest of the silver foil and black backing paper. This also reduced the concentration. I then scraped the bits left near the top.

So at that point looking into it visually. It is just wood back there. With some small spaces between the wood where drywall is seen. Other than that it is essentially empty.

The smell is greatly reduced. But is still off gassing something as it is not a clean smell in the bedroom.

I have spoken to a few people on this issue. Which made me think to turn to the forums to get some kind of help. As this matter is now ongoing and I have no way of isolating what the smell could be.

People have asked me if there are any leaks. Either from the rad or bleeder valve. I can confirm that there is no leak whatsoever. There is carpet in both the bedroom and living room area. The carpet is not too dark. So any leak, especially that black water running through the heating system in our small building would show up on the carpet. I also left paper around the pipes to see if anything leaked and it was dry.

The smell disappears when the heat is off. So it cannot be mold.

The very frustrating thing about this scenario is that the materials in both the bedroom and living room are identical. Both radiators were painted with the same oil based paint. Both living room and bedroom have the same carpet. The living room radiator does not emit any kind of smell whatsoever. And yet if I look inside with a flash light it has that silver foil and black backing paper. But does not smell at all.

Which brings me to the very heart of this problem. If both rooms have the same materials surrounding the radiators. And seem to be painted the same. Likely installed by the same people at the same time as radiators are identical. Meaning one is not any newer in terms of model or make.

For some unknown reason the bedroom radiator emits a strong odor when the heat goes up. It is much less now that I used the air compressor. But not enough to breathe it in. I do not know exactly what is in the air but it does not smell to me to be safe to inhale for prolonged periods of time.

I have had contact with one person from another site. He keeps saying there must be a chemical or pesticide used on the bedroom rad. That does not seem likely. Pesticide was not used. As for chemicals. That I am not certain about. Both rads look the same to me and have the same surrounding materials.

Now the bedroom rad has no silver foil or black backing paper inside. And I am trying to isolate what that smell could be. And then take some kind of action to lessen it. But I cannot understand what is heating up and emitting that smell?

Cannot be mold. Otherwise smell would not disappear with the heat off. Is not a leak, as that would show. Also a leak would smell even with the heat off. Carpet goes underneath the rad. But carpet is in the living room as well and no smell at all there.

Can wood or dry wall cause this sort of smell when heated?

How does a person go about isolating a smell? I cannot think of a logical way to approach this problem. I forced air through that rad thinking it would improve the smell. And it worked to reduce the concentration of the smell. But did not get rid of it. It is much less now but even at let's say 7% concentration, that room is not likely safe to sleep in.

Hence my turning to the forums in the hopes that someone with experience could point me in the right direction. As I have researched this endlessly. And am no closer to finding a solution.

Any feedback or assistance would be immensely appreciated. Thank you.


  • Jamie HallJamie Hall Member Posts: 12,698
    In the ten years that radiator was off only the good Lord knows what dust and crud accumulated on it. The only solution I can think of -- particularly since you note that the smell is less since you blew compressed air over it -- is to somehow clean the radiator much more thoroughly. Particularly the back side and underneath parts, which are hard to see even with a mirror -- never mind get at.

    The best solution of course is to take it out and clean it thoroughly, then reinstall it. Clean and reinsulate the enclosure and area around it while you are at it Tough to do when it's cold outside.

    As a stop gap measure, you might try thoroughly heating it and the area around it with a heat gun. Do not set the gun over 250 F, and keep an eye on everything while you are doing it.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • John94John94 Member Posts: 2
    Jamie Hall, the heat gun is a brilliant idea. This is something that could speed up the process.

    As for cleaning it. You're right of course. Taking it out and disconnecting it. Cleaning it manually. This would be ideal. Trouble is that I live in a building and they would have to drain the entire system and pay for a plumber to take it apart. Not sure that the building would want to incur the expense.

    The heat gun could be a real solution here. As the smell has decreased since the foil and black backing paper has come out. But is not all the way gone. Is at around 7-10% concentration now. Where it was much stronger before.

    If it is off gassing something, very high heat could cure it completely.

    I appreciate your advice. I also understand what you mean by watching things as it is high temps and something could go wrong quickly. I might ask a friend who does some plumbing and handy work to help me with this.

    If it is off gassing oil based paint. Could I still use the heat gun, and if so, where would be the most ideal places to contact?

    Thanks again Jamie Hall.
Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!