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Can you reverse flush an On Demand Hot Water Heater ?

2869 Views 3 Replies 2 Participants Last post by  gladesteen
Hi all,

Had a situation in my Water Well where ants moved in. That problem is solved, but the clippings and debris they dumped into the well are still an issue. I've got it almost gone by running my outdoor faucet with cheesecloth as filter.

My Rinnai Hot Water heater inline filter was completely clogged up. I removed that, cleaned it and ran 2 gallons of vinegar through the system, but its still not flowing like it used to. I've checked the online filter, even left it out and still the same thing on the hot water side. Lower than usual pressure.

Can i REVERSE the flow ? Meaning hooking up the sump side on HOT and exit side on COLD to reverse flush the Rinnai ? Any damage or check valves ?

Thanks, Mark
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I doubt it would cause any harm, since the water is flowing freely. You're using a sump, bucket and hoses as is called for in the flushing instructions, right? Let us know how it goes.


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