Marathon MR40245

The MR40245 has a tank capacity of 52 gallons and an electrical requirement of 240 volts. This model is the big brother of the MR40238, featuring 4500w elements instead of 3800 watt elements.

This unit is the perfect fit for a family of 4 with regular hot water demand. The 4800w elements provide a quicker recovery time when heating the incoming cold water. Newer construction homes with modern electrical panels will match perfectly with this unit. If your home is of older construction and the wiring isn’t up to the demand of 4500w elements, you will want to go with the MR40238 instead.

Marathon MR40245 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 MR40245 Online Today!



Capacity: 40 Gallons
Element Size: 4500 Watts (240 Volts)
Tank Height: 65 1/2 Inches
Tank Diameter: 21 3/4 Inches
Weight: 90 lbs
Standards: Meets or exceeds ANSI standard and is UL listed. 
First Hour Rating: 52 Gallons 
Energy Factor: .94 

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: