Browse Categories

Rheem Residential Marathon Water Heaters

Marathon™ non-metallic electric water heaters are durable, lightweight, and warranted not to leak as long as you own your home*

Available Capacities:
40, 50, 85, and 105 gallon models

Available Warranties:
Lifetime limited tank warranty: 6 year limited parts warranty

  • Seamless, blow-molded, polybutylene 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 highest energy factors (EF) available!
  • Pipe wrap energy saving kit included to achieve maximum energy savings
  • 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
  • Thermally fused upper element provides protection against "dry-firing" - stainless steel incoloy lower element for resistance to lime build-up
  • Factory installed conduit between element control boxes
  • All plastic tank eliminates the need for an anode rod
  • Factory installed temperature and pressure relief valve
  • Factory installed vacuum relief valve
Marathon Series Models


40 MR40245
    50 MR50245
85 MR85245
    105 MR105245
  SHORT 50 MSR50245
TALL 40 CMR40233  240V, 3.0KW
  40  CMR40245  240V, 4.5KW
  50 CMR50230  240V, 3.0KW
  50 CMR50238  240V, 3.8KW
  50 CMR50245  240V, 4.5KW
  75  CMR75238 240V, 3.8KW
  75  CMR75245  240V, 4.5KW
  85  CMR85245  240V, 4.5KW
  105  CMR105230  240V, 3.0KW
  105  CMR105245  240V, 4,5KW
SHORT 50  CMSR50230  240V, 4.5KW
  50  CMSR50245  240V, 4.5KW

Available in Canada only


Displaying products 1 - 2 of 2 results
Rheem MR15120 Marathon Point-of-Use Water Heater
Rheem MR15120 Marathon Point-of-Use Water Heater
Price: $887.50
Rheem MR15120 Marathon Point-of-Use Water Heater
15 Gallon / 2000w / 120v
Rheem MR50245 Marathon Water Heater
Rheem MR50245 Marathon Water Heater
Price: $1,378.75
Rheem MR50245 Marathon Water Heater
50 Gallon / 4500W / 240V
Shopping Cart
Your cart is empty.