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Marathon 15 Gallon Water Heater


Quick Overview

MR15120 Electric Water Heater
SKU: MR15120


This item will usually ship direct from the factory in 1-2 business days.

Rheem's Marathon™ Point-Of-Use hot water heaters feature the same specifications and high efficiency designs as the Marathon™ full sized units. They are great for applications where larger water heater units won't fit or special applications such as:

  • Restrooms in offices or commercial buildings
  • Apartments or Condos
  • Cabins and other recreational properties
  • Restrooms in large homes located away from the central water heater

Energy Savings

When using an electric water heater with immersion elements, 100% of the element’s energy goes into the water. The difference between a energy efficient model and a standard water heater is the ability to retain the water temperature over time. A standard water heater can lose up to 30 degrees of water temperature in 24 hours. Marathon™ electric water heaters are designed to lose only 5 degrees of water temperature in that same time period. This can account for huge savings in your energy bills by eliminating the constant need to run element cycles to keep the water hot.

This is done by surrounding the water holding talk with Polyurethane Envirofoam™ insulation to keep the heat in the tank.


Capacity: 15 Gallons
Element Material/Size: Copper Fused/2000 Watts (120 Volts) 
Tank Height: 35 3/4 Inches
Tank Diameter: 21 3/4 Inches 
Weight: 58 Lbs 
Standards: Meets or exceeds ANSI standards and is UL listed. 

All units come complete with factory installed temperature and pressure relief valve, replaceable brass drain valve, and vacuum relief valve. The connections for cold inlet and hot outlet are 3/4 inch NTP, and should be roughed in at 5 3/4 inches on center.


Rheem Marathon water heaters (MR and MTS models) used in single family dwellings come with a lifetime tank warranty as long as you own your home. If the home is sold, the warranty transfers to a 10 year warranty from the date of the original installation. The next owner receives warranty coverage for the time remaining. All elements and parts are warranted for 6 years from manufacturing date against factory defects.

Units must be registered within 90 days of installation to qualify for Rheem's Limited Lifetime Warranty. 

Additional Information

Manufacturer Rheem
Energy Source Electric
Tank Size (gal) 15
Certifications None
First Hour Rating Less Than 50

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