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Posted on Feb 17, 2009
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Noritz tankless water heater/dishwasher not hot enough to clean

We have a Noritz tankless water heater that we installed 2 years ago. Our showers and clothes washer seem to function fine. It is our dishwasher that seems to take forever to clean a load of dishes. We let the sink faucet run until the water is hot then turn on the dishwasher while it is running...to insure there is hot water to start the load. The load still takes forever to wash and I'm not sure how sanitized the load actually is at the end.
Has anyone else had a problem between their tankless water heater and their dishwasher?

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  • Posted on Jun 10, 2009
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You are doing everything you can. Your dishwasher probably isn't drawing enough hot water to activate the unit so opening the faucet and flowing more water will activate the unit. Just try to adjust the flow from the faucet to a point it, plus the draw from the dishwasher, will activate the unit. This will come with trial and error as I am sure you have already experienced. Also, open the dishwasher when it does get filled and check the water temperature. You might have the unit set at a low discharge temperature. Do you have a touchpad to control the water temperature adjustment?

  • hooper200 Apr 09, 2011

    I have a noritz tankless hot water heater and am convinced the dishwasher is not being supplied sufficient hot water. I have noticed at the kitchen sink, when the water is not on full blast the hot water is luke warm. The noritz is still running and says 120 degrees, but the water is just luke warm(if the flow rate is not full blast). My dishes are never clean!!! Is there a solution to this dishwasher delima???

  • Anonymous Nov 02, 2011

    hi, we just installed a new tankless reheam and there is no hot water in our dishwasher when filling. I check it several times and it was cold water. I turned on the kitchen faucet and I had hot water. I am not sure what to do and mwould like to have a answer if anyone can help me. Our email address is [email protected]. Any advise would be great. Thanks for your help.. Tim

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