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Gunk on my heat exchanger

jjaslow Member Posts: 5
I have a radiant heating system with a Navien NPE-210A water heater as the heat source. I've been having some water flow issues (GPM as listed on the control panel ranging from 0.4 - 0.8) and took off the cover to take a peek inside. I noticed a bunch of gunk on the heat exchanger. Any idea what it could be and if I should be concerned? I spoke with Navien who recommended a new check valve. It's on order, but I'm also wondering if more parts need to be replaced or cleaned. They didn't seem to speak much about it.


PS. Yes, I know I should be using a boiler instead of a water heater :( . I'm working on the funds for it, and am hoping to last the season with the water heater!


  • neilc
    neilc Member Posts: 2,671
    spray those areas with bubbles / windex when it's firing,
    looks like, might be, exhaust leakages,
    you might try snugging the screws you can get at,
    known to beat dead horses