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Marathon 50 Gallon 2 Port Thermal Tank


Quick Overview

MTS50200 Thermal Storage Tank
SKU: MTS50200


Designed for Alternative Energy Applications - Specifically designed for installation as a thermal storage tank
   - If you are looking for a 50 gallon Marathon water heater, please see the MR50245

Marathon Thermal Storage Tanks, designed for alternative energy applications, are built to last and easy to install.


  • Lightweight design, water port fittings located on the front of the storage tank and a full port, full flow brass drain valve makes installation easy. 
  • Thermally fused elements provide protection against “dry-firing”.
  • This Marathon tank is ideal for alternative energy applications due to the backup electrical element which provides 40 gallons or more of heated water and the large water connections for lower pressure drop.
  • Equipped with a seamless blow molded inner tank with a structural fiberglass shell, the Marathon thermal storage tanks have maximum strength and are guaranteed against leaks.
  • Designed for alternative energy applications.
  • The design features provide unmatched quality and strength with a polybutene tank impervious to rust and corrosion and titanium sheath elements resistant to lime build-up.


Gallon Capacity: 50
Tank Height (inches): 62.75
Height to Water Connection (inches): 66.75
Diameter (inches): 23.5
Height to Lower Port (inches): 13.5
Height to Upper Port (inches): 46
Approximate Shipping Weight (lbs): 100


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 No
Tank Size (gal) 50
Certifications None
First Hour Rating No

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