Marathon Hot Water Heaters

Marathon Hot Water Heaters

From Concept to Reality

It started as a simple idea nearly 20 years ago…
How can we build a water heater that will last a lifetime?

Based on the success of plastic brine tanks used for over 30 years in the water softening industry, the idea took form. Originally branded as "Project X", the concept was developed with three important goals:

  • Build a water heater that can have a true lifetime warranty
  • Manufacture the most energy efficient water heater available
  • Keep it "installation friendly" by having it lightweight and easy to connect

The unique water heater took form and in 1987 the Marathon® water heater was born.

The Marathon water heater is manufactured by Water Heater Innovations, Inc. at our state-of-the-art plant in Eagan, Minnesota.

Today, Water Heater Innovations, Inc. is a wholly owned subsidiary of Rheem Manufacturing Company, the world leader in innovative water heating products. At Water Heater Innovations, our only product is the Marathon water heater and we have maintained the original vision by making the water heater with the longest design life, best warranty and highest efficiency available


Water Heater Innovations is unique in the water heater industry. We don't sell 5 year warranty heaters; we don't sell 10 year heaters; we don't sell "upgraded warranties" that increase the warranty without changing the water heater itself. We sell only one thing - the best possible water heater.

You see, we don't believe it's good business to make water heaters that only last 5 to 10 years, so you have to buy another... and another... We believe you should only have to buy one water heater. Because it is the only water heater you will buy, it should be as technologically advanced as we can make it, offering a combination of efficiency, environmental friendliness and durability. We look at it as a long term relationship... even if you buy just one Marathon.  For more information and pricing on Marathon Water Heaters, contact Matt Needham 

Marathon Hot Water Heater