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Clicking Hydronic Heater


First off, I apologize if this has been asked before, but I couldn't find it using the search function. I recently moved into an apartment on the east coast and my heater has been making very loud clicking sounds. I've asked my landlord to fix it repeatedly, but have been told that it's normal and nothing can be done. It's driving me insane, so I've spent a few hours searching the internet and inspecting the unit.

From everything I've been able to find out, I think it's a hydronic unit. The fins are very bent in both locations, one on the top and one inside. I'm assuming the one inside is for AC, but I really don't know. I've read that the bent fins can cause the clicking noise when they heat/cool and there are universal fin combs that I can get online.

I wanted to check and see if this makes any sense before jumping in an potentially making things worse. I'm including a few pictures that I took of the unit specification sticker, bent fins, and water pipes.

Let me know if you have any ideas!


  • Abracadabra
    Abracadabra Member Posts: 1,948
    Do you have a video of the clicking sound? Could just be expansion noise.
  • LandryParr
    LandryParr Member Posts: 2
    Hi Abracadabra. I should have done that to start with... I'm including a Youtube link of the clicking sound. Thanks a bunch for your help!

  • Abracadabra
    Abracadabra Member Posts: 1,948
    Sounds like expansion noise. Separating the bent fins may help with the noise to ensure that they don't rub against each other as the HX expands.
  • tjorn
    tjorn Member Posts: 6
    It may be from scale in the system.