Rheem Marathon Point-of-Use Series

Marathon Point-of-Use

Marathon® Point-of-Use non-metallic electric water heaters are durable, lightweight,easy to install and offer a longer warranty

Non-metallic Tank Features

  • Seamless, blow-molded, polybutene tank – impervious to rust and corrosion
  • Multiple layers of filament wound fiberglass give the tank unmatched strength
  • Polyurethane insulation helps reduce energy consumption and standby heat loss
  • Recessed drain valve is out of the way of brooms and scrubbers
  • High temperature polysulfone dip tube
  • Tough molded polyethylene outer shell resists dents, scratches, and salt air
  • All plastic tank eliminates the need for an anode rod

Easy Installation & Service

  • Marathon point-of-use’s lightweight tank is easy to maneuver and position
  • Bowl shaped tank bottom allows complete sediment draining
  • Water tight grommets keep out overhead moisture and condensation
  • 3/4-Inch inlet and outlet connections
  • Built for applications where larger water heaters won't fit, such as apartments,recreational property, and restrooms in offices and commercial buildings

Element Wattage and Voltage

  • 15 and 20-Gallon with a 2,000 watt element and 120-voltage; 20-gallonwith a 3,000 watt element and240-voltage


  • Thermally fused element to protect against dry-firing; low watt, density for long life
  • Full-flow, brass drain valve
  • Temperature and pressure relief valve
  • Low Lead compliant
  • Standard replacement parts

  15 MR15120  --
  20 MR20120  --
  20 MR20230  --
CMR15120 120V, 2.0KW
20 CMR20120 120V, 2.0KW
20 CMR20230 240V, 3.0KW

Available in Canada only

  • Featuring the same unique design as the Marathon, but in smaller capacities
  • Ideal for condos, cabins and light-duty commercial applications
  • 15 and 20 gallon capacities


Marathon Point-of-Use
Pre-NAECA Specification Sheet (US)
Specification Sheet (US)
Use and Care Instructions (US and Canada)
Warranty Information


United States
Residential Use: Lifetime limited tank warranty, 6-year limited parts warranty
Light Duty Commercial Use: 10-year limited tank warranty, 1-year limited parts warranty

Residential Use: Lifetime limited tank warranty, 6-year limited parts warranty
Light Duty Commercial Use: 10-year limited tank warranty, 1-year limited parts warranty

KwikComfort® Financing can help make your purchase even easier.
Rheem makes it easy to find a financing option that works for you! With many options and benefits available, KwikComfort Financing is the best way to get the home comfort you need without the wait.

  • Applications made easyWe'll help you avoid lengthy contracts, headaches and hassles.
  • Kwik credit decisionsYou'll get an answer to your application within minutes.
  • Fast credit for the futureFinance your Rheem equipment and anything you want to add later.
  • Reduced interest/fixed paymentsGet low interest and fixed monthly payments until the purchase is paid.
  • Minimum monthly paymentTake advantage of convenient monthly payments that fit your budget.
  • Deferred interest/no interestEnjoy interest-free payments as long as the balance is paid by the due date.
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