Marathon 40 gal. Tall 6 Year 4500-Watt Lifetime Electric Water Heater-MR40245 - The Home Depot
Message to Our Customers


Model # MR40245

Internet # 202584259

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

Marathon 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.

$799.00 / each


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
  • Meets new 2015 NAECA Standards

    NAECA Standards

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.


Assembled Depth (in.) 
21.75 in 
Assembled Height (in.) 
61.5 in 
Assembled Width (in.) 
21.75 in 
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 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 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 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 Great water heater My old heater started leaking ... after some shopping around I selected this 40 Gal plastic tank heater. It was easy to install and I did it my self with no issues. I now have hot water that has no metal taste because this tank does not require a "rust rod" due to the plastic tank. Still 4500 watts of power like the others and little more expensive than a regular heater .. looks great and works great. January 23, 2015
  • 2015-05-02T10:49:28.013-05:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_28, tr_28
  • loc_en_US, sid_202584259, prod, sort_default
2 >>


Curbside Truck Shipping (By Appointment) includes delivery to receiving area/dock for businesses or curbside for residential orders. The carrier will contact you to make a delivery appointment with a 4 hour window once the items have arrived at the local hub in your area. Delivery appointments are required.

Orders for this item may be upgraded to a more specialized service for an additional fee.

Other Delivery Options:

Basic Home Shipping includes delivery to your doorstep or first dry area outside with no signature or appointment required.

Threshold Home Shipping (By Appointment) includes delivery across your first doorway or threshold (i.e. into garage, backyard, or first room of the home). The carrier will contact you to make a delivery appointment with a 4 hour window once the items have arrived at the local hub in your area. Delivery appointments are required.

White Glove Home Shipping (By Appointment) includes delivery to the room of your choice, unpacking and debris removal. Assembly is not included. The carrier will contact you to make a delivery appointment with a 4 hour window once the items have arrived at the local hub in your area. Delivery appointments are required.

If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.