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

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Blow off periodically releases small amt of water.

Hello, I have a brand new rannai 94 ls. all works fine,except when i shut off facuets.sometimes when I shut off water a small amt of water is realeased from the safetey blow off, it almost sounds like a water hammer. Do I need a exp tank ? or some air cushions?

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  • toghog Dec 02, 2008

    water pressure is 105 psi I just checked it. 2 moro I will be installing a reducing regulator,or else my problems will get worse

    tnx for the reply.

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This may be the case. If you have a check valve installed on the heater to prevent the hot water from backing up into the inlet or cold water side this may happen. A hot water expansion tank at the heater or water hammer devices near the fixture itself should cure the problem.
One question, how high is you water pressure?

Posted on Dec 01, 2008

  • James Feragola
    James Feragola Dec 02, 2008

    I think you solved your own problem, just by reducing the pressure you should not overcome the spring on your safety relief valve and see any water squirt out. While I'm sure that 105 psi makes for some exhilarating showers, it can cause negative problems in fixtures not designed to handle pressures that high.

    Glad you found a solution.


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Posted on Jan 02, 2017

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