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Raise temp above 120 - Rheem Tankless Water Heater Main Remote Control

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Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

Posted on Oct 27, 2012


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Our 606 reliance electric hot water heater has the letters a b c for the temp control not 120-160 degrees. On what letter a-b or c should the temp be set on to get 120 degrees

We will just assume that "a" is the lowest temperature
to correspond to 120 degrees, while "c" for 160 degrees.
So try setting it at "a" and feel the hot water that flow.
Or it could be the other way. Just feel the hot water that
flow. It will be done in a few minutes. I hope this will help


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