Through an inspired blend of innovation, teamwork, technology and industry expertise, A. O. Smith has created a full line of state-of-the-art water heaters and boilers that combine incredible performance with higher-than-ever energy efficiency.

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

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.

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