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I don't know about Suburban but the Atwood's are set at 140 degrees.
If you are careful you can lift the relief valve toggle and release some water so you can measure the temperature.
This is from the service manual.
"The thermostat and ECO are pre-set surface-mounted
discs. The thermostat is set at 140° F and is the same
thermostat used on the gas side of the electronic
ignition water heaters. The ECO is a backup
thermostat and will trip if the thermostat fails and the
water temperature exceeds 170° F."
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Clay WA5NMR - Fulltiming- 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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