Kenmore Power Miser 12 gas WH won't reach rated temperatures

Discussion in 'Water Heater Forum, Tanks' started by Rock51, Feb 14, 2010.

  1. Rock51

    Rock51 New Member

    Apr 26, 2009
    My Kenmore Power Miser 12 gas WH won't reach the rated temperatures at the various settings on the thermostat. At "B" setting, the hot water is supposed to be 140F. It was actually 115F yesterday. At Very Hot, it hits 138F, not 160F. (I would never purposely set hot water temp at 160F. Only 140F or lower.). This problem has been building over time. I am talking about the temp of the water when I first turn on the tap after the heater has fully charged the tank and the burner is off. If I cannot get the proper temp, even when the tank is fully charged and the water has just been turned on, isn't this due to a gas control valve/thermostat problem? There's no mixing valve. Thyks.
  2. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Aug 9, 2009
    The temperature will be different depending on where your taking the temperature readings from. The further from the heater the cooler the temperature.

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  4. Plumber Jim

    Plumber Jim Member

    Mar 29, 2008
    plus the stats are plus or minus 10 degrees from setting.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Thermostats are notoriously inaccurate, which is why they use letters which could mean anything, rather than numbers. All the letters tell you is that if "B" gives you the water temperature you like then reset it at "B" any time it has to be moved. If it has to be hotter then use "A" or "C" depending on which way your dial rotates, and vice versa if it is too hot at "B".
    Last edited: Feb 27, 2010
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