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Marathon 85 Gallon Water Heater

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Quick Overview

MR85245 Electric Water Heater


Rheem Marathon water heaters are the best electric water heaters on the market. Rheem Marathon water heaters feature a highly efficient design with a lightweight tank that will not corrode. These electric water heaters have a residential limited lifetime warranty that sets them apart from other electric water heaters on the market. Marathon water heaters have unique non-metallic tanks made of cross-fiber polybutene resulting in a stronger and higher quality electric water heater that lasts much longer than electric water heaters made of steel. Marathon water heaters come with one fused upper heating element to help protect against dry firing. This 85 gallon electric water heater also comes with a lower heating element that is sheathed in titanium to help provide resistance against lime and sediment build up. This 85 gallon marathon electric water heater is a great replacement for other standard 80 gallon electric water heaters. GP Conservation also stocks a slightly smaller 75 gallon Rheem Marathon water heater which can be a good replacement for 80 gallon water heaters.


  • 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's out of the way of brooms and scrubbers.
  • Tough molded polyethylene outer shell to resist against dents and scratches.
  • High temperature polysulfone dip tube.
  • Factory installed conduit between element control boxes.
  • All plastic tank eliminating the need for an anode rod.

Energy Savings

The 85 gallon Rheem Marathon water heater (MR85245) is unrivaled in its energy savings. Rheem Marathon water heaters have Polyurethane Envirofoam insulation filled tank shells which significantly reduces heat losses by trapping the heat inside the tank and keeping the water hotter for longer periods of time without the elements cycling on and off to re-heat the water. Rheem marathon water heaters all use electric immersion water heater elements which transmit 100% of their energy into heating the water.

Standard electric water heaters chronically suffer from high standby losses; up to 20% of the energy used in old standard electric water heaters is to compensate for heat loss. This is not the case for Marathon electric water heaters due to the Envirofoam insulation filled tank. Over the course of a year this can account for significant savings on the home owner's electric bills.


Capacity: 85 Gallons
Element Size: 4500 Watts (240 Volts)
Tank Height: 70 1/4 Inches
Tank Diameter: 28 1/4 Inches
Weight: 134 lbs
Standards: Meets or exceeds ANSI standard and is UL listed.
Energy Factor:

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.

This 85 gallon marathon electric water heater (MR85245) is a great replacement for other standard 80 gallon water heaters.


Rheem Marathon water heaters come with a residential limited lifetime tank warranty as long as you own your home. If the home is sold, the warranty transfers to 15 years from the date of installation and the next owner receives coverage for the time remaining. All elements and parts are warranted for 6 years from manufacture date against factory defects.

Additional Information

SKU MR85245
Manufacturer Rheem
Energy Source Electric
Tank Size (gal) 85
Certifications None
First Hour Rating (gal) 90 - 99