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Model # MR50245

Internet # 205466186

Store SKU # 344915

50 Gal. Tall 4500-Watt Lifetime Electric Water Heater

This item has been discontinued.
The Home Depot no longer carries this specific product.

$1,065.00 /each
  • Plastic tank wont rust; ideal in hard water applications
  • Lightweight jacket and tank make it easier to install
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.




Model # MR50245

Internet # 205466186

Store SKU # 344915

Store SO SKU # 1000532496

The 50 Gal. Tall Marathon lifetime electric water heater provides hot water with peace of mind. Plastic tank eliminates the need for anode rod and prevents smelly water. Rigid foam insulation covers entire tank for maximum efficiency. Bowl-shaped tank bottom drains completely for easy service and sediment removal Lower titanium heating element for superior resistance to lime buildup. Factory installed temperature and pressure relief valve offers added protection. Lifetime limited warranty on tank and 6 year limited warranty on parts. Meets or exceeds National Appliance Energy Conservation Act (NAECA) requirements.

  • Call 1-855-650-2786 before noon for same-day installation in most areas
  • 50 Gal. tank provides an ample hot water supply for a 2 - 3 bath home
  • Electric water heater is easy to maintain
  • Lifetime limited warranty on the tank, plus a 6-year limited warranty on the parts for your convenience
  • Meets or exceeds NAECA requirements
  • Bowl-shaped tank bottom drains completely for easy service and sediment removal
  • Requires a 240-Volt electrical connection for installation
  • Plastic tank eliminates the need for an anode rod and prevents smelly water
  • Automatic thermostat keeps water at your desired temperature
  • Pipe wrap energy saving kit is included for energy savings
  • Exceeds national appliance energy conservation act (NAECA) and ASHRAE requirements
  • Designed for easy replacement of your existing water heater
  • Call 888-988-9935 before noon for same-day service in most areas, or visit our Water Heater Installation page for more information.

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Tank Valve Size (in.) 
Water Connection Size (in.) 
Application Type 
Finish Family 
First Hour of Delivery (gallons/hr) 
Fuel Type 
Maximum Temperature (F) 
Minimum Temperature (F) 
Product Weight (lb.) 
103 lb 
Tank Capacity (gallons) 
Water Connection Location 
Water Heater Features 
Overheat Protection,Temperature Pressure Relief Valve 
Water Heater Profile 
Wattage (watts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 
ENERGY STAR Certified 
Labor Warranty 
Part Warranty 
6 Year 


Rated 4.5 out of 5 by 8 reviewers.
Rated 5.0 out of 5.0 by Best ever! Our well water at our new country home has heavy iron content, even with a water softener and a carbon pre-filter. There was no way I was gonna live with a heater that has a sacrificial anode rod, as over time that makes for really smelly water as the rod gets eaten-up (think rotten eggs.) This heater totally solves the anode issue, since there is no need for one with the poly tank. Our 50 gallon Marathon heater has a really fast recovery rate compared to some other heaters we've experienced. Easy on the electricity bill as well - especially it's large capacity. We've had in for 3 years now, and even if it lasts only 10 years or so total, I will replace it with the same type! June 14, 2015
Rated 5.0 out of 5.0 by Working Great I installed this water heater because our well water is acidic. With the plastic construction of this heater the issue of the water heater tank rotting out will now be a non-issue. April 22, 2015
Rated 4.0 out of 5.0 by advancement in technology Needing a replacement water heater, I didn't want to use the steel tanks anymore. I was looking for longer life span of the product. Installed this several weeks ago without any major issues. The vacuum breaker dripped until the system was fully pressurized. Aside from that, it works fine and looks like it should be the last water heater I replace in my home. Time will tell September 9, 2015
Rated 5.0 out of 5.0 by Easy, smooth purchase! The only negative was the vacuum valve on the cold water in-take that leaked while filling tank with water. That should be pointed out in the instructions. It stopped leaking when tank was filled but I almost did not continue filling it fearing a full tank of water that leaks. Other than that, great experience. August 11, 2015
Rated 3.0 out of 5.0 by Product GREAT; service @ Cape May NJ store AWFUL I avoid Home Depot purchases because of the service that I received at the Cape May NJ store; your store was the only option that I had to purchase this particular unit, so I bought it from you. The product itself is fantastic in that it has a lifetime warranty- no exceptions! August 11, 2015
Rated 5.0 out of 5.0 by Marathon Lifetime Electric Water Heater The space for the water heater needed to be enlarged and expanded electrical capacity was needed--but once that was done, it was easy going. (We had a professional do it.) We are very happy, once again, to have the assurance of hot water, not wondering when we will have to replace it--never. August 4, 2015
Rated 5.0 out of 5.0 by Excellent investment!!! Replaced a standard hot water heater that was rusting from the inside out causing the water to be brown tinted. I kept noticing rust stains on some laundry in random and realized it was unnoticeably failing. After doing some research I figured this was the way to go. I purchased this tank over two years ago and this thing is awesome... Being a lifetime warranty on the tank and no anode to rust, it seemed like a no brainer. Yes it does cost more than a standard, but it will definitely pay for itself in years... June 5, 2015
Rated 4.0 out of 5.0 by AAH hot water The first shipment came in about 10-14 days. THank goodness for the 30 day return policy . I was able to return the product to Home Depot. The heating element did not heat and the electrician said there was a defect in the factory installed pipes allowing water to leak into the electric connection. I got a second unit 14 days after returning the first. No problems . The unit works great so far. It's only be installed 1 week but I get hot water more quickly in the far end of the house. May 1, 2015
  • 2015-10-11T10:48:36.653-05:00
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