Marathon SP310020 Heavy Duty Lower Thermostat

The SP310020 is a replacement thermostat for the lower element on Marathon heavy duty water heaters.

If your water heater does not appear to be maintaining the water temperature, you may need a new thermostat. A properly functioning thermostat isĀ integral to the proper operation of your electric water heater.

Marathon carries a full line of replacement service parts for their water heaters. Always verify that the service part you are purchasing is compatible with the Marathon model number you are servicing.


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The SP310020 is compatible with the following Marathon heavy duty models:

  • MHD85238
  • MHD105238

If you’re looking for the upper element thermostat for Marathon heavy duty water heaters, please look at part number SP210246.