Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Popping and Banging in a Combi-Core

A customer has a 73 gal, 76k btu Combi-Core heater used for domestic hot water with a radiant system thru the internal coil. It's about five- six  years old, on a well with probably hard water, and it began popping during the heating cycle a few months ago and is getting louder with time. I have heard this same noise before, my own two 40's used to do it before I put in an indirect. A sudden draw (like the automatic washer) will trigger it more. I presume it's scale on the water side of the flueway? Any expert advice on a cure (if there is one) would be welcome! 


  • Mark Eatherton
    Mark Eatherton Member Posts: 5,839
    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • Plumdog_2
    Plumdog_2 Member Posts: 873
    Who woulda thunk

    I'll talk them into it. Someone suggested bonding the hot and cold pipes within three feet of the heater; but there are dielectics.............Probably should be removed!
This discussion has been closed.