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HomeMarathon
INNOVATION
marathon
The Last Water Heater You’ll Ever Need To Buy
Its award-winning construction makes the Rheem® Marathon® water heater the most durable electric water heater ever made.And its industry-best warranty makes it a smart purchase you can count on for years to come.
Unmatched Durability
Our innovative insulation process, seamless liner and tough outer jacket make Marathon the most durable in the business
Simple Installation & Service
Unique design allows one-person installation for fast service, lower costs and quick maintenance
Lightweight Design
Marathon’s lightweight tank is easier to maneuver and position, and features a bowl tank that drains completely
Lifetime Tank Warranty
Tank is built to last for as long as the homeowner owns their home, and backed by a lifetime warranty1
Marathon Point-of-use
Unmatched Durability
15- and 20-Gal. Capacities
Ideal for condos, cabin and light-duty commercial applications
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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.
Marathon Standard
Unmatched Durability
30-, 40- and 50-Gal. Capacities
High efficiency design and a lightweight tank that won't corrode
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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.
Thermal Storage Tank
Unmatched Durability
50-, 85- and 105-Gal. Capacities
Marathon® thermal storage tanks feature a lifetime limited tank warranty and a 6-year limited parts warranty
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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.
Marathon & KwikComfort Deliver a Legacy of Savings
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.
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Nothing Compares to Marathon Water Heaters

Marathon Plastic Tank
Competitor stainless steel tank
Number of Replacement Units Allowed
Perpetual
1 Per Customer
Warranty Unrestricted by Water Conditions
Warranty Unrestricted by Water Temperature
Warranty Transferable
Low Product Weight
Dry Fire Protection
Element
Titanium
Stainless Steel
Dent / Corrosion Resistant Jacket
Saltwater-Resistant Jacket
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Get a Rheem Marathon Water Heater Today
Ready to enjoy a lifetime of hot water?
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