Marathon Water Heater – MR105245

The Marathon water heater MR105245 features 4500w elements and a tank capacity of 105 gallons. This Marathon water heater model is perfect for a family of 7 or more people with normal hot water demands 0r for those larger homes 3 or more bathrooms or extra large bathtubs.

Even if your sizing requirements call for a 50 or 85 gallon tank, you can install Marathon water heater MR105245 and be assured that you will never run out of hot water again.

The 4500w elements in this model allow for a quicker recovery time then its 3800w siblings. If you need a model with smaller elements, check out the MR85238 or the MR75238 as the MR105245 is not offered in a lower wattage element configuration.

Marathon Water Heater MR105245 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 Water Heater MR105245 Online Today!



Capacity: 105 Gallons
Element Size: 4500 Watts (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 water heaters are offered with a full line of service parts such as water heater elements and thermostats. The following service parts are available for this model: