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Internet #205652054

Model #SP210245

Store SKU #1001869733

Upper Thermostat for Marathon Electric Water Heaters

  • Compatible with Rheem Marathon Electric Water Heaters
  • For use in 2-element Water Heaters, Upper Thermostat
  • Manual Reset prevents overheating
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Product Overview

This Rheem Marathon Upper-Element Thermostat is specifically designed to be used as the upper thermostat in a Rheem Marathon residential electric water heater. These water heaters often have a "non-simultaneous" design, which means that only 1 heating element is on at any given time. This type of thermostat is for use in 2-element water heaters.
  • Fits Rheem Marathon residential water heaters only
  • For use in 2-element Marathon water heaters
  • Temperature-sensitive bi-metal disc delivers snap action to the contacts
  • Speed and force of contact separation provide a long-lasting, dependable performance at high electrical loads
  • Durable metal and plastic construction
  • Manual reset switch helps prevent overheating
  • UL and CSA listed for safety
  • 1 year limited warranty
  • Works on Models: MR40245, MR50245 and MSR50245
  • California residents see Prop 65 WARNINGS
  • Call 1-855-400-2552 before noon for same-day installation service in most areas, or visit our Water Heater Installation page for more information.
  • California residents

Additional Resources

From the Manufacturer

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Product Depth (in.)2 inProduct Height (in.)8 in
Product Width (in.)4 in


ApplicationWater HeaterCompatible Brand/ModelVarious Rheem Marathon Water Heaters
Finish FamilyBlackFor Use WithElectric Tank
MaterialPlastic and MetalPack Size1
Product Weight (lb.)1 lbReturnable90-Day
Thermostat TypeUpper Thermostat

Warranty / Certifications

Manufacturer Warranty1 Year Limited

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
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Customer Reviews

  • 4.7
    out of 42 reviews
  • 73%recommend this product
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Showing 1-10 of 42 reviews
Excellent easy service...
Excellent easy service
  • Verified Purchase
Seems to be working fine....
Seems to be working fine.
  • Verified Purchase
Protech Upper Thermostat Marathon water heater
This part was the exact replacement part I needed, took maybe 5 minutes to install.
  • Verified Purchase
  • Recommended
  • Verified Purchase
  • Verified Purchase
Easy to find the part on your web site and...
Easy to find the part on your web site and delivered in the time frame indicated
    Perfect fit for my marathon 85 gallon tank in spite...
    Perfect fit for my marathon 85 gallon tank in spite of other “expert” reviewers. Don’t believe everything you read in these reviews.
          Rating provided by a verified purchaser...
          Rating provided by a verified purchaser
          • Verified Purchase
          Showing 1-10 of 42 reviews