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                                       Our mission is to provide safe, reliable, and affordable
                                     electric service to our members, now and into the future!

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Marathon Water Heaters

The last water heater you will ever need to buy!

It's award winning construction makes Marathon® water heaters the most durable electric water heater ever made. And it's industry best warranty makes it a smart purchase you can count on for years to come.

Unmatched Durability: Marathon's® patented insulation process, seamless liner and tough outer jacket make it the most durable in the business.

Lightweight Design: Marathon’s® lightweight tank is easier to maneuver and position, and features a bowl tank that drains completely

Lifetime Tank Warranty: The tank is built to last for as long as the homeowner owns their home, and backed by a lifetime warranty.  (Warranty is provided to original customer in a residential application after online product registration is complete. Registration must be completed within 90 days of installation. (See warranty certificate for complete information.)

Purchase and rebates are only to members of Clay-Union Electric with connected service at location of water heater placement.

50 Gallon

50gallon

50 Gallon - 2 options

Model # MR50238
dimensions: 66.75" tall x 23.50" diameter

cost at pick up $1,406.70 (price includes tax)
$300 rebate

In stock

*Model # MSR50238
dimensions: 47.25" tall x 28.25" diameter

Please call for up to date pricing
$300 rebate

*available but not in stock, 
please call 1 week in advance to order

85 Gallon

85gallon

85 Gallon

Model # MRG85238

dimensions: 70.25" tall x 28.25" diameter

cost at pick up $1,917.33 (price includes tax)

$510 rebate

100 Gallon

100 gallon

100 Gallon

Model # MRG105238

dimensions: 70.75" tall x 30.25" diameter

cost at pick up $2,150.84 (price includes tax)

$600 rebate

Load control and rebate program:

A Marathon has a lifetime warranty on the tank to the original purchaser and location for leaks. If the tank should ever spring a leak while at its' original point of installation and with the original owner, a replacement heater will be supplied at no cost for the new heater. Labor to remove or install is owners responsibility.

The water heater must be connected to the load management system for rebate and credit. It must remain connected for 3 years, if at any time it is disconnected the member will be subject to repay the rebate prorated to the time of purchase from the time of disconnection.

$6.00 credit on your monthly electric bill if you use over 600 kWh per month.

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Contact Info

Clay-Union Electric
P.O. Box 317
31321 SD Hwy. 19
Vermillion, SD 57069

605-624-2673 or 1-800-696-2832

Office Hours: M-F 7:30-4:00
 

Mission Statement

Our Mission is to provide safe, reliable and
affordable electric service to our members,
now and into the future!

Safe Electricity

Safe Electricity

Board and Employee Login

©2025 Clay-Union Electric. All Rights Reserved..

  • Home
  • Your Account
    • Capital Credits
    • Start Service
    • Pay Online/My Account
    • Billing FAQ
      • Billing Cycle and Due Date
      • Budget Billing
      • Payment Options
      • Rates
      • SD Energy Assistance
    • Yard/Street Light Repair
  • About Us/History
    • Nondiscrimination Statement
    • Our History
    • Board Directors and Service Area
    • By-Laws
    • Privacy Policy
  • Member Programs
    • Rebates and Incentives
      • Heat Pump Rebates
      • Irrigation Rebates
      • Marathon Water Heaters
      • Replacement Appliance Rebates
    • Load Control
    • REC Program
    • REED Fund
  • News and Community
    • Basin Bus Tour
    • Clay County Fair/Member Appreciation Day
    • Cooperative "Sparks" Newsletter
    • Energy Solutions
      • Beat the heat this summer
      • Generation Mix
      • Home Safe Home
    • Treated Wood Consumer Information
    • Youth Programs
      • Basin Youth Excursion
      • Scholarship Opportunities
      • Touchstone Energy Scholar of the Week
      • Washington DC Youth Tour
  • Employment Opportunities
    • Crew Foreman
    • Other Cooperative Employment Opportunities
  • Safety
    • 811 Call Before You Dig
    • Back-to-school preparation includes life-saving driving tips
    • Farm Safety
    • Grain Bin Clearance
    • Space Heater Safety
    • Tree Planting
    • Winter Power Line Safety
  • Contact Us