Marathon MHD105238

External view of the MR Series Tank

Rheem’s Marathon™ heavy duty water heaters are specifically designed for installation in harsh environments or where high temperature water is needed.

Each heavy duty model comes equipped with factory installed titanium elements for the maximum protection against extreme water conditions and provides superior corrosion resistance.

The MHD105238 has a tank capacity of 105 gallons. This makes it perfect for food service and agricultural industries.

Marathon MHD105238 Features:

  • Seamless, blow-molded, polybutene tank – impervious to rust and corrosion 
  • Multiple layers of filament wound fiberglass give the tank unmatched strength 
  • Polyurethane Envirofoam™ insulation helps reduce energy consumption 
  • The most energy efficient in its class 
  • Recessed drain valve is out of the way of brooms and scrubbers 
  • Tough molded polyethylene outer shell resists dents and scratches 
  • Bowl shaped bottom allows complete sediment draining 
  • High temperature polysulfone dip tubes 
  • All plastic tank eliminates the need for an anode rod 
  • Thermally fused element to protect tank against “dry-fire”; low watt, density for long life. 
  • Factory installed temperature and pressure relief valve 
  • Factory installed vacuum relief valve 
  • Inlet and outlet connections are 3/4″ NPT 
  • Water tight grommets keep out overhead moisture and condensation 

Buy the Marathon MHD105238 Online Today!



Capacity: 105 Gallons
Element Size: 3800Watts (240 Volts)
Tank Height: 70 3/4 Inches
Tank Diameter: 30 1/4 Inches
Weight: 152 lbs
Standards: Meets or exceeds ANSI standard and is UL listed. 
Energy Factor: .91 

Service Parts

Marathon offers a full line of service parts for their entire water heater line. The following service parts are available for this model: