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40 gal. Tall 6 Year 4500-Watt Lifetime Electric Water Heater
  • Marathon
  • Model # MR40245
  • Internet # 205931673

40 gal. Tall 6 Year 4500-Watt Lifetime Electric Water Heater


Compare to Discontinued Model View Product

Discontinued Model



Model # MR40245

Internet # 202584259

40 gal. Tall 6 Year 4500-Watt Lifetime Electric Water Heater

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

  • Provides ample hot water for households with 2-4 people
  • Make sure it fits: measure your space to ensure dimensions fit
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.




Model # MR40245

Internet # 202584259

Store SO SKU # 607988

The 40 gal. Tall Marathon lifetime electric water heaters 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
  • 40 gal. tank provides ample hot water for a 1 -2 bath home
  • Electric water heater is easy to maintain
  • Non-metallic tank and jacket resists corrosion
  • Thermally-fused upper element protects against dry firing
  • 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.
  • Meets new 2015 NAECA Standards

    NAECA Standards

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
21.75 in 
Tank Valve Size (in.) 
Water Connection Size (in.) 
Amperage (amps) 
Application Type 
Estimated Yearly Operating Cost ($) 
Finish Family 
First Hour of Delivery (gallons/hr) 
Fuel Type 
Maximum Temperature (F) 
Minimum Temperature (F) 
Product Weight (lb.) 
91 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 
No Warranty 
Part Warranty 
6 Year 


Rated 4.7 out of 5 by 28 reviewers.
Rated 5.0 out of 5.0 by This product is everything I expected so far. The delivery was excellent, on time and without any issues. Installing the heater was extremelly simple. I used Sharbyte connectors and the whole installation was done in less than 30 minutes. I am still surprised how easy this was to do. So far the water temperature is great. December 11, 2013
Rated 5.0 out of 5.0 by Excellent water heater, better than any I have owned We have had several water heaters in the past few years, living in the country the well water was hard on the other heaters. We tried a Marathon, upon advice from one of our new neighbors, and have not had one minute of trouble since then, just reliable hot water when we need it. We are going to replace our dairy barn water heaters with the larger Marathon units right after January 2012. Our local plumber also told us he has had almost zero problems with the Marathons and that the ones that had problems were due to being installed by someone who did not know what they were doing. December 13, 2011
Rated 5.0 out of 5.0 by I would not use any other type of water heater!!! I purchased this water heater because it is the only water heater on the market that does not put aluminum into the water. All other water heaters have a warning not to drink the water from a hot water heater because they contain an aluminum anode that adds poisonous aluminum salts into the water and are not safe to drink. Check out the other hot water sites, they say right in their web sites "do not drink the water from their hot water heaters" it is for washing and bathing only. This water heater produces safe clean hot water. October 9, 2012
Rated 5.0 out of 5.0 by So happy with this hot water heater The Marathon is so quick and efficient! I never wait for hot water or run out. It was easy to install and given the energy rating I'm hoping to save a lot just not having to rely on oil anymore. April 23, 2013
Rated 4.0 out of 5.0 by First one leaked, Home Depot provided warranty replacement Marathon heater developed slow internal leak after two months. Home Deport arranged warranty replacement through Rheem. Employee (Amy) even delivered replacement in her personal vehicle and on her lunch hour. Hope this one meets expecations. Home Depot customer service could not have been better. January 26, 2013
Rated 5.0 out of 5.0 by Excellent water heater! I live in a condominium and when it was time to replace my aging water heater, I wanted to get something that would last. The Marathon unit in a 40 gallon size was larger than the 50 gallon unit it replaced, and barely fit into the master closet where it had to be installed. Despite the overall size, the unit is quite light when empty, and easy to maneuver into place. It was installed in October of 2012, and has worked flawlessly since. The quality seems very high, and I definitely recommend this water heater. Now I don't have to worry about the tank leaking and damaging other units in my building. June 17, 2014
Rated 5.0 out of 5.0 by Very well designed Living in an upper condo, I wanted peace of mind from leaks as well as efficiency. This unit gives both. The delay between turning on the tap and having hot water is reduced to almost nothing so I waste much less water. Recharge time is fast. Very nice unit. Easy to install and no need to wrap because it's already insulated. September 2, 2012
Rated 5.0 out of 5.0 by This product is a great value and has a great warranty. This is our second Marathon Water Heater, the first one was so great that when our second conventional heater went out we did not even look around, we bought the another Marathon. December 12, 2011
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