Older "gas only" Suburban water heaters had adjustable thermostats. The newer, DSI/electric models have a non-adjustable thermostat. It typically is a 130F thermostat with a 180F high temp limit switch. Your specific water heater may have a malfunctioning or higher temperature thermostat installed. There are some 140F thermostats available, CW has one on sale now for around $10.
If you are experiencing "overly hot water" on both gas and electric operation, chances are slim that both thermostats have failed and you may be expecting something your water heater can't provide (cooler hot water).
One "may not work workaround" that you might try is to slightly open the 1/4 turn winterizing valve on the water heater cold water input. That may (I've never tried it) blend water going into the water heater with cold water as it bypasses the water heater. That "blended water" would be similar to adjusting the water temperature at the faucet with the cold/hot taps. While it may effectively lower the water temperature from the hot water tap, you may experience widely varying temperature swings when showering and using the "pause" control. So, be forewarned that "blending water using the winterize valve" may not be a suitable solution, then again, it may help somewhat.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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