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Marathon 85 Gallon 2 Port Thermal Tank


Quick Overview

MTS85200 Thermal Storage Tank
SKU: MTS85200


Designed for Alternative Energy Applications - Specifically designed for installation as a thermal storage tank
   - If you are looking for an 85 gallon Marathon water heater, please see the MHD85238

Marathon Thermal Storage Tanks have unbeatable features that can stand up to the harshest water conditions and will protect the tank from rust, corrosion and lime buildup. The tanks are designed for easy installation and specifically designed for alternative energy applications.


  • Constructed of a seamless blow molded inner tank with a structural fiberglass shell that provides superior strength and a no leak assurance.
  • Built to last with a polybutene tank impervious to rust and corrosion and titanium sheath elements resistant to lime build-up. 
  • Molded polyethylene outer shell is resistant to dents and scratches.
  • Easy installation: lightweight design, water port fittings located on the front of the storage tank for convenient access, full port, full flow brass drain valve for easy draining.
  • Other features: thermally fused elements provide protection against “dry-firing”, a bowl shaped bottom for complete sediment removal, and a recessed drain valve that is placed out of the way of brooms and scrubbers.


Gallon Capacity: 85
Tank Height (inches): 66.25
Height to Water Connection (inches): 70.25
Diameter (inches): 28.25
Height to Lower Port (inches): 14.5
Height to Upper Port (inches): 49.5
Approximate Shipping Weight (lbs): 134


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) 85
Certifications None
First Hour Rating No

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