Its award-winning construction makes the Marathon® water heater the most durable Rheem® electric water heater ever made. And its industry-best warranty makes it a smart purchase you can count on for years to come.
Our patented insulation process, seamless liner and tough outer jacket make Marathon the most durable in the business
Unique design allows one-person installation for fast service, lower costs and quick maintenance
Marathon’s lightweight tank is easier to maneuver and position, and features a bowl tank that drains completely
Tank is built to last for as long as the homeowner owns their home, and backed by a lifetime warranty1
Residential KwikComfort® Financing makes it easy and smart to enjoy hot water that lasts a lifetime. With low monthly payments, your Marathon Water Heater will only make a small impact on your monthly budget. And because it’s built to last, your Marathon will still be going strong long after it’s paid off.
Explore the strength of Marathon’s features below:
Advanced circuitry ensures that heating elements only turn on when surrounded by water, prolonging their life.
2.5″ polyurethane insulation reduces heat loss for greater energy efficiency.
The Marathon water heater features a seamless, blow-molded plastic inner tank, so it won’t rust or corrode.
Multiple layers of filament wound fiberglass give the tank unmatched strength.
Rheem Marathon Water Heaters: Built for a Lifetime [3:25]
15- and 20-Gal. Capacities
30-, 40- and 50-Gal. Capacities
50-, 85- and 105-Gal. Capacities
See the comparison by clicking the appropriate tab below:
| Number of Replacement Units Allowed |
Perpetual | 1 Per Customer |
| Warranty Restriction Due to Water Condition |
No | Yes |
| Warranty Restriction Due to Water Temperature |
No | Yes |
| Warranty Transferable1 |  |
 |
| Low Product Weight | |
|
| Dry Fire Protection | |
|
| Element | Titanium | Stainless Steel |
| Dent / Corrosion Resistant Jacket | |
|
| Saltwater-Resistant Jacket | |
|
| Lifetime Savings on Water Heater Replacement |
$1,1972 | 0 |
| Low Product Weight | |
|
| Dry Fire Protection | |
|
| Element | Titanium | Copper |
| Anode Rod | No | Yes |
| Corrosion Resistant | |
|
| Warranty1 | Lifetime | 6 Years |
| Lifetime5 Water Heater Needed | 1 | 8 |
| Dent / Corrosion Resistant Jacket | |
|
| Saltwater-Resistant Jacket | |
|
Ready to enjoy a lifetime of hot water?
