Question about Rheem EcoSense by 7.4 GPM Tankless Water Heater Natural Gas High Altitude

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How do I flush this unit

I was told to run vinegar through it to descale it. How do I do that?

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1) Copy following link for steps showing how to run white vinegar through Rheem tanklessx heat exchanger to partially remove scale that coats heat exchanger and reduces unit efficiency and causes error code IL:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime

2) Tankless are prone to scale inside heat exchanger and require yearly deliming to mitigate effects. Do the required yearly maintenance to avoid common error codes.

3) Expected cost of maintenance and repair is more expensive than estimated $1-8 monthly energy-bill savings from owning tankless.

Posted on Dec 31, 2012

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http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdf
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