Question about Rinnai Webstone The isolator EXP tankless water heater Service Valves WRIK

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No water flow from hot water tap with a rinnai tankless water hea

We have a rinnai tankless water heater and it is very cold here tonight (4 degrees with windchill which is REALLY cold for GA) - and when we turn on the hot water tap - NOTHING comes out. :(

The cold water tap produces water with no problem - it is ONLY the hot water tap that is dry.

Does anyone have any ideas please?
Thanks!


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  • Anonymous Jan 17, 2009

    I have the same problem, I live in North Carolina and it got cold last night and now the hot water is not hot and it just trickles out of the sink and every other faucet in the house.

  • Anonymous Mar 03, 2009

    i have exterior rinnai water heater that is froze up whats the best way to thaw out

  • Lori degenaro
    Lori degenaro Jan 07, 2014

    I have the same problem in South Carolina ! Nothing happens when I turn on hot water, cold water side is fine , what do I do???

  • ohashas Jan 07, 2014

    I heated up the brass fittings in the hot water lines and relatively quickly, i had flow again.

  • ohashas Jan 07, 2014

    I had same problem in NC this morning. Went under house and used blow dryer on the brass connections and poof hot water again. Hope this helps.

  • Anonymous Mar 30, 2014

    Hot tap Flow restricted but flicking cold tap on and off solves problem

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Its A Possibility The Left Over Water In The Hot Is Frozen. If Your Line Is Exposed Outside Somewhere It Can Easily Freeze Up. Turn On The Hot Water Everywhere In The House And If Accessible Check The Lines To See Where The Warmth Ends. You Can Leave One Off Over Night In Hopes That It Will Eventually Defrost.

Posted on Jan 16, 2009

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I also have a Rinnai and live in Michigan and have had it maintained, but I have no Water pressure from the faucet when another faucet is on they are telling me that is rated as the gas comes in the home at 5.8 on your utitlity company and the Hot water heater calls for7.0 it states it on the hwheater go figure.DRS

Posted on Jan 30, 2009

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Take the cover off the unit and use a hair dryer to slowly thaw the HE in the heater so it doesnt burst.

Posted on Jan 20, 2009

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