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 https://heatinghelp.com/contact-us/.

Hissing sound from certain radiators after heating

jk914jk914 Posts: 1Member
Hello and thank you in advance for your expertise.

I have a 100-year-old house with a Burnham steam boiler that is less than ten years old. I have no problems with hissing, gurgling or getting temperature to each radiator on my two stories while the system is heating.

After heating, which I presume is when steam condenses again, certain radiators make a very loud hissing sound at the air vent. With my limited knowledge (so far) of steam heat, I understand that condensation happens very rapidly and I think the system is searching desperately for air.

Last season, I replaced all radiator air vents with Varivalves but did not touch the main vents-- my hissing issues did not exist last season. This is a single pipe system but I have two branches at the boiler: one for the front side of the house, one for the rear. The two branches rejoin in the basement and return to the boiler with pitch. It looks like I have two main vents, (I think), located at the end of both runs before they rejoin.

Let me know if photos would help and what, specifically you'd like to see.

Thank you
Sign In or Register to comment.

Welcome

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