Question about Noritz 6.3 Gallon Residential Tankless Water Heater - N-063S

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Pressure fluctuating during its working water pressure goes up and within minuets it comes down to nearly zero

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  • ali_kalkhora Feb 17, 2009

    water pressure in pump out put goes up and down.
    i mean when thermostat trigger the burner the pressure goes up and after openning water tap it goes down very fast.

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  • Master
  • 547 Answers

Add pump to main line thank you for useing fixya

Posted on Feb 17, 2009

  • 2 more comments 
  • albert getty
    albert getty Feb 17, 2009

    oh change the pump if it's not that old get ahold of manufacture and have them replace whole unit.

  • albert getty
    albert getty Feb 17, 2009

    i just looked more then 5 people have same problem get ahold of maker thank you

  • albert getty
    albert getty Feb 17, 2009

    intake and output for water are backwards

  • albert getty
    albert getty Feb 21, 2009

    please let me know if your pipes are backwards thank you

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  1. COLD MIX, HEATER DEACTIVATES
    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
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Water turns cold very quickly


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Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

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