Top Rated
Marathon 40 Gal. Tall 4500-Watt Double Element Non Metallic Electric Water Heater with Lifetime Warranty
- Plastic tank will not rust; ideal in hard water applications
- Make sure it fits: measure your space to ensure dimensions fit
- WA and OR Residents – see disclaimer below before purchasing
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Product Details
About This Product
Make sure you have enough hot water with this Marathon 40 gal. electric tank water heater. Ideal for hard water applications for homes with three to five people, the bowl-shaped tank bottom drains thoroughly, ensuring quick service and sediment elimination. The plastic design helps prevent smelly water while making an anode rod unnecessary.
Highlights
- Washington, oregon, and colorado residents: your home is in a state that requires demand response water heaters, if this water heater does not meet demand response requirements, please select an approved demand response model available on homedepot.com
- If your home is in a state that requires Demand Response water heaters, please select an approved Demand Response model available on homedepot.com.
- Lifetime limited warranty on the tank, plus a six-year limited warranty on the parts for your convenience (registration required)
- Marathon's lightweight tank is easier to maneuver and position
- Bowl-shaped tank bottom drains completely for easy service and sediment removal
- Perfect for replacement: the tank's size and light weight makes it easy to get home and in position
- Non-metallic tank and jacket resist corrosion
- Titanium lower element for superior resistance to lime build-up
- Multiple layers of filament wound fiberglass give the tank unmatched strength
- Peace-of-mind: backed by a lifetime limited warranty on the tank and a 6-year limited warranty on parts (with registration)
- Full-flow, brass drain valve
- Thermally-fused upper element protects against dry firing
- High temperature polysulfide dip tube
- Need help with a home project? Let us do it for you - 1 800 HOME DEPOT or visit Home Depot.com/services
- Call 1-855-650-2786 before noon for same-day installation service in most areas or visit our water heater installation page for more information
- Meets 2015 NAECA standards
- Return Policy
- California residentssee Prop 65 WARNINGS
Product Information
Additional Resources
Shop All RheemSpecifications
Dimensions: H 61.5 in, W 21.75 in, D 21.75 in
Dimensions
Kilowatt | 4.5 |
|---|---|
Product Depth (in.) | 21.75 in |
Product Height (in.) | 61.5 in |
Product Width (in.) | 21.75 in |
Water Connection Size (in.) | 3/4 |
Details
Amperage (A) | 18.75 A |
|---|---|
Application Type | Residential |
Efficiency Level | High |
First Hour of Delivery (gallons/hr) | 51 |
Household Size | 2-4 |
Indoor/Outdoor | Indoor |
Nominal Tank Capacity (gallons) | 40 gal |
Product Weight (lb.) | 91 lb |
Required Volt Connection | 240 volt |
Returnable | 90-Day |
Tank Warranty | Lifetime |
Uniform Energy Factor | 0.92 |
Water Heater Features | Overheat Protection, Temperature Pressure Relief Valve |
Water Heater Profile | Tall |
Water Heater Type | Electric |
Wattage (watts) | 4500 W |
Warranty / Certifications
Certifications and Listings | UL Listed |
|---|---|
Part Warranty | 6 Year |
Questions & Answers
What does the water heat to?
Hi Jake, Based on the information provided, the internal dial thermostats can be turned down as low as 90°F (32°C) or adjusted up to a maximum of 150°F (66°C). For additional information please contact 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
How is it for chemical build up, like rust and residue
Hi Gene, The Marathon MR50245 is immune to rust and tank corrosion thanks to its non‑metallic design. In reference to chemical build‑up, it is limited to mineral scale on the heating elements, which can be managed with regular flushing or water treatment. For additional information, please contact 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
What size are fittings on tank
Hello Steve, The water connections are 3/4". Isaiah
Can you respond to these studies about polybutylene https://plasticexpert.com/learn/polybutylene-pb-pipe-fail? I saw you answered its NSF safe, but does look like it breaks down with hot water and also with chlorine? I am genuinely interestd in the tank
Hi Chris, Based on the information provided, the Marathon is reinforced, protected, and backed by a lifetime warranty because it has been engineered under confidence of the liner’s durability under hot water and chlorinated conditions. The failure mode of PB plumbing doesn’t directly translate to the tank liner environment. For additional assistance and information, please call 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
I have an existing marathon 85 water heater cost and installation new one. Piedmont sd
They are charging us $1000 to install. We are in the Midwest.
Hi Linda, Based on the information you provided, cost of installation varies per location. For installation estimates, we recommend contacting contractors in your area for pricing. For additional information, please call 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
What is this thing? It started leaking after I flushed out the water heater. It’s just a drip but causing me concern
Hello, We apologize for the inconvenience and hope the issue has been resolved. If you still need assistance, please call Technical Support at 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST, and one of our experienced analysts will be happy to assist you. Isaiah
There are cautions on the internet about Polybutylene which can pose significant health risks due to chemical leaching into drinking water. Why is this safe as a lining in a tank?
"Significant" health risks? Just more internet spew. But who drinks or otherwise consumes hot water? Even when rinsing after brushing teeth, people spit out the water. You should never use hot water to get a head start on cooking.
Most people do Not drink from hot water lines in bath, shower or kitchen sink where hot water is normally used.
Hi Gomer, The Marathon’s polybutylene lining is safe, NSF‑certified, and one of the reasons the tank lasts so long. For additional assistance, please call 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
What part number heating element do I need to purchase if I have a failed element? I have a 50 gallon Marathon Tall water heater.
Hi Grady, For parts assistance configuration, please call 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST. Derius
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Customer Reviews
4.4 out of 5
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Thank you for sharing your experience! We are so glad to hear that the construction has impressed you and that installation was a breeze. Switching to our non-metallic, seamless plastic tank is a great way to eliminate rust and corrosion entirely, and we are confident this tank will provide you with a lifetime of reliable hot water!
Derius
We love hearing that you’re happy with your water heater! Thanks for sharing your experience and feedback about the water connections. Should you need any assistance in the future, please give us a call at 866-479-4566.
Moneke
Thank you for sharing your experience. We’re sorry to hear about the installation challenges and service concerns. We appreciate your feedback and hope your next unit provides reliable performance.
For additional assistance, please call 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST.
Derius
Thank you for sharing your experience. We’re glad installation went smoothly and that the clear directions helped. It’s great to hear the expansion tank and bracket setup are working well, we hope the heater provides reliable service for many years.
Derius
Thank you for sharing your experience, Catherine. We’re sorry to hear about the leaking drain valve and the delays you encountered while trying to resolve it. We’re glad Home Depot was able to assist with a return and reset your warranty date, but we understand how frustrating the situation was, especially with time‑sensitive installation needs. We appreciate you taking the time to provide this feedback.
Derius
Thank you for sharing your experience, Glenn. We’re sorry to hear the vacuum relief valve was leaking right out of the box. That’s definitely not what you should expect with a new unit. We appreciate you taking the time to let us know and share this feedback.
Derius
Thank you so much for the 5‑star review and your recommendation! We’re thrilled to hear the water heater is exactly what you needed and that it’s delivering odor‑free performance along with the added confidence of a lifetime tank warranty. It’s also great to know your delivery experience was smooth and helpful—from quick shipping to a friendly driver who went the extra mile.
We appreciate you choosing our product and are glad to be part of providing years of reliable hot water. Thank you again for sharing your experience!
Moneke
Thank you for your review and feedback. Our goal is always to provide the best product and service possible to our customers. We will certainly use your feedback to help current and future customers have a better experience and product.
Isaiah
Thank you for sharing your experience. We’re very sorry to hear about the leak and the frustration it caused right after installation. That’s certainly not the quality we aim to deliver.
Don't sound like you called in for technical or warranty assistance—our support team is available at 866-279-4566, Monday through Friday, 7:00 AM to 7:00 PM CST, and is here to help with any issues if you need us in the future.
Jennifer
Rheem is happy to hear that the Marathon model offers you the assurance of longevity that you are looking for. Thank you for the 5-star review!
Isaiah
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Compare Key Features
Product Snapshot | |||
|---|---|---|---|
Ideal for 2-4 people households seeking a reliable, high-efficiency electric water heater with a lifetime tank warranty. | Ideal for homeowners looking for a lifetime warranty, ensuring leak-free hot water with easy installation. | Ideal for homes with 3-5 people, this 50 gal. electric water heater offers a lifetime tank warranty and easy sediment removal. | Ideal for eco-conscious homeowners seeking energy savings with smart features, leak detection, and a 10-year warranty. |
Capacity | |||
40 gal | 50 gal | 50 gal | 40 gal |
Recovery Rate | |||
51 gph | 57 gph | 41 gph | |
Leak Detection | |||
Heating Element Type | |||
Titanium | |||
Smart Controls | |||
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