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Marathon 85 Gallon 3 Port 4500W Thermal Tank


Quick Overview

MTS85345 Thermal Storage Tank w/ Backup Element
SKU: MTS85345


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


  • The large water connections allow for lower pressure drop and the backup electrical element provides 40 gallons or more of heated water.
  • The seamless blow molded inner tank with a structural fiberglass shell provides superior strength and will protect against unwanted leaks.
  • These tanks are built to last with a polybutene tank that is impervious to rust and corrosion and titanium sheath elements provide resistance to lime buildup. 
  • Specifically designed for installation as a thermal storage tanks, this Marathon tank is ideal for alternative energy applications.
  • Installation is easy with a full port, full flow brass drain valve for fast draining and water port fittings located on the front of the storage tank.
  • Plus, thermally fused elements provide protection against “dry-firing”.


Gallon Capacity: 85
Element Wattage: 4500
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): 26.5
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 Electric
Tank Size (gal) 85
Certifications None
First Hour Rating No

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