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Old 01-13-2017, 01:28 PM   #1
cwf
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Home on-demand WH

Not directly an AS specific question... thanks in advance for whom ever can assist.

I have a "condensing" on-demand, propane Water Heater. The appliance provides adequate warm water (125 degrees). However, when using or pausing, the doggone thing will rumble and rattle... it shakes walls.

I have taken hopeful diagnostics to no avail..

Does anyone here have time, wisdom and inclination on a solution?

Thanks !!
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Old 01-13-2017, 03:09 PM   #2
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Home on-demand WH

Instant tank need to be flushed out to remove lime deposits. There's a special valve that needs to be installed to enable flushing. They use a citrus acid to flush with. It's not harmful to skin and won't contaminate the water supply.

The heat exchanger will fail prematurely if you don't flush it out.
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Old 01-13-2017, 03:35 PM   #3
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I agree with Bigventure, you probably have a build-up of mineral deposits. The 6 gallon Attwood in our Airstream started crackling and popping a year ago, when we were camped for an extended period on a limestone mountain, using local well water. It did not get to where it was shaking the walls, but it was noticable.

We flushed the WH with regular water, then introduced a water/vinegar solution through the water pump (as if we were winterizing). We ran the water heater through a heating cycle, let it sit for a few hours, then drained and rinsed again. We got quite a bit of calcite crystals out. The noises stopped.

Then we bought a water softener.
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Old 01-13-2017, 06:08 PM   #4
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Thank you!!! Will do as you recommend! I don't think the WH is made anymore.. so may have a short service life if it can't be resolved.
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Old 01-13-2017, 06:55 PM   #5
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Hello all,
New guy here and have been lurking to learn all I can about Airstreams prior to purchasing, much more to it than I first though!
Anyway I am a licensed plumber and have dealt with your issue, I think you should try(if you can access) the combustion blower and clean the impeller and any ducting associated with the air flow for combustion. My own Takagi did this and I was able to cheat the system by changing fan speed with a dip switch, this is a band aid fix but it worked.
Yesterday I repaired a customer HTP high efficiency W/H that uses similar technology by cleaning the swirl plate ahead of the combustion blower and vacuuming the airway and the loud distructive sounding pulsating noise is GONE.
Good Luck!
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Old 01-17-2017, 07:47 PM   #6
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Great ideas! Thanks!
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Old 02-02-2017, 01:05 PM   #7
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Problem resolved! Replaced with Navien.
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