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

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! 


This discussion has been closed.


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