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

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I have a Rinnai tankless. The temperature fluctuates wildly

I suffer occasional loss of heat in the sinks but the basement shower is the worst. Temperature will fluctuate from burning hot to icy cold withing seconds with touching the controls. This will last for months, and then not happen again for a while. First my serviceman thought our pipes might be clogged with sediment, but they are pretty new. Then he thought there wasn’t enough gas coming into the house, so now we have enough for an apartment building.

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  • Maine 1234 Jan 20, 2009

    I have a similar problem. The temperature in our showers slowly goes from too hot to too cold over a 20 second interval. I had a repair guy come without success. The one insight I do have is that we installed a low flow shower head about 8 months ago, when the problem “might” have started and I think the low flow is a problem for the water heater. At the low flow the heater switches from high heat to low heat but never to the right heat. I’ve switched to a normal shower head and the problem is better but not solved. My family is still not satisfied so I’m interested in for information.

  • gsalexander Feb 03, 2009

    when i set the temp it will not reach the 125 degree temp that its set at.

  • jimbeam4me Feb 15, 2009

    hi we have the rinnai 20 hot water (tankless) but the hot water go colder as you use it this has goten worse over time now you are turning the tap up just to get hot water then you have to turn it down so that you are not burnt we have 9lt slow shower heads & its take 6/8 month to get to the point that you are turning the taps constontly just to get hot water we have no controlers on the system

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I think the dip tube in your water heater has failed, this is a plastic tube that goes in the cold side of your tank and forces incoming cold water to the bottom of the tank allowing hot water out at the top. When this tube deteiorates the incoming cold water mixes at the top of the tank causing the problem you have. the dip tube runs about 5 bucks but takes someone with pluming skills to install.

Posted on Jan 09, 2009

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Bad PC board.
Bad sensor.
Don't buy a tankless because the problems can be endless.

Before blaming the tankless however.
Perform the yearly required maintenance on burner
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http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdf

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