Marathon MR15120

The MR15120 has a tank capacity of 15 gallons and an electrical requirement of 120 volts.

This tank size plus it’s smaller electrical requirements make it a perfect companion for a shop with a sink.

Marathon MR15120 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 MR15120 Online Today!



Capacity: 15 Gallons
Element Size: 2000 Watts (120 Volts) 
Tank Height: 35 3/4 Inches
Tank Diameter: 21 3/4 Inches 
Weight: 58 Lbs 
Standards: Meets or exceeds ANSI standards and is UL listed. 

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: