Question about Rinnai Desa Vent-Free Infrared Gas Heater: Vent-Free Infrared Gas Heater(18,000 BTU)

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Rinnai water heater is not keeping the water hot

Our water heater will heat up the water then after a few moments it will go cold for a few seconds then hot then cold. It makes for a very uncomfortable shower.

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How much water pressure do you have, it should be between 65 and 75 to work properly if it is lower or if it pulsates like thru a well system, then you will experiance this,

Posted on Jun 29, 2009

  • gary miller
    gary miller Jun 29, 2009

    how much water pressure do you have, it should be between 65 and 75 to work properly if it is lower or if it pulsates like thru a well system, then you will experiance this,

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SOURCE: Rinnai R53 Natural Gas Tankless Water Heaters

now to me this would result form not enough water going into the system. do you have a seprate unit on the bottem to take off and clean?

Posted on Mar 31, 2008

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Rinnai r94ls


This is a clear indication of what is called: "Hard Water"-- meaning that you have too many minerals in your drinking water!-- This problem is aggravated when you heat the water (as in your Hot Water Heate3r!)-- Heating causes the mineral (normally dissolved in the cold water)- to precipitate OUT when heated-- and thus they end up setting in your piping AFTER the heater.
Solution: YOu may have to install a water softener, to reduce the 'hardness' of your water.
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If piped as per the manual, try turning the water off to only one of the units. Turn on a hot water tap and see if the unit stays on without interruption. Then try the same on the second unit. You may find that one unit has a bad flow control, which is shutting off the flow of water.

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