Marathon Water Heater – MSR50245

This water heater is in Rheem’s Marathon water heater’s MSR series which means features a low profile tank. The Marathon water heater tank is shorter and has a larger diameter than the Marathon water heater MR50245.

The MSR50245 Marathon water heater is the perfect choice for applications where space is limited or when the location of the demand is on the opposite end of the structure as the main water heater. Does it take forever to get hot water to your master bathroom? The MSR series of water heaters are a perfect solution.

As with the other Marathon water heater models, the MSR series feature a high efficiency design with a lightweight tank that won’t corrode. The unique polybutene Marathon water heater tanks create a stronger and higher quality heater that will last longer than steel tank heaters. 

Marathon Water Heater MSR50245 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 MSR50245 Online Today!



Capacity: 50 Gallons
Element Size: 4500 Watts (240 Volts)
Tank Height: 47 1/4 Inches
Tank Diameter: 28 1/4 Inches
Weight: 100 lbs
Standards: Meets or exceeds ANSI standard and is UL listed. 
First Hour Rating: 61 Gallons 
Energy Factor: .94 

Service Parts

The following service parts (water heater elements & thermostats) are available for this Marathon water heater model: