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Marathon 50 Gallon Water Heater


Quick Overview

MR50245 Electric Water Heater
SKU: MR50245


Marathon water heaters carry a limited residential lifetime warranty. Each Marathon water heater features a high efficiency design that is lightweight and durable. Marathon water heaters make a great replacement water heater when your current water heater is leaking because they are guaranteed not to rust or corrode as long as you own your home. Rheem Marathon water heaters are made of unique cross-fiber polybutene creating a stronger and higher quality electric water heater with much longer life expectancy than regular steel electric or gas water heaters. Marathon water heaters come factory equipped with one fused upper heating element to protect against dry firing and a lower titanium plated water heater element that provides greater protection against lime and sediment build-up compared to copper or steel elements used in standard electric water heaters.

Marathon water heaters are the best electric water heaters on the market today.


  • Seamless, blow-molded, polybutene tank impervious to rust and corrosion.
  • Multiple layers of filament wound fiberglass to give tank extra strength.
  • A recessed drain valve so it is out of the way of brooms and scrubbers.
  • A tough molded polyethylene outer shell to resist against dents and scratches.
  • A high temperature polysulfone dip tube.
  • Factory installed conduit between element control boxes.
  • All plastic water heater tanks eliminating the need for an anode rod.

Energy Savings

The 50 gallon Rheem Marathon water heater (MR50245) is unmatched in its energy savings. Every Marathon water heater uses electric immersion water heater elements which transfer 100% of their energy into heat. Rheem Marathon water heaters also significantly reduce heat loss due a Polyurethane Envirofoam insulation-filled tank shell. This foam traps the heat inside the tank and keeps the water hotter for longer periods of time without power cycling the elements to re-heat the water. 

Standard electric hot water heaters suffer from high standby losses. Water temperatures in old electric water heaters can drop by up to 30 degrees if the water heater was not used for a 24 hours period. This is not true for Rheem Marathon water heaters. The super-insulated Rheem water heaters with the Marathon label are the best electric water heaters on the market today. Water stored in a 50 gallon Marathon will lose only 5% of heat in a 24 hour period in case of a power outage.

Over the course of a year Marathon water heaters can account for significant savings on a home owner's electric bills.


Capacity: 50 Gallons
Element Size: 4500 Watts (240 Volts)
Tank Height: 66 3/4 Inches
Tank Diameter: 23 1/2 Inches
Weight: 100 lbs
Standards: Meets or exceeds ANSI standard and is UL listed
First Hour Rating: 61 Gallons
Energy Factor: .95

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) 50
Certifications None
First Hour Rating 60 - 69

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