Without a doubt, the heat exchanger is the most critical part of any furnace.  Amana brand furnaces are built with its patented
Million-Air stainless steel tubular heat exchanger, a heat exchanger that is so efficient and has such a long service life, it leaves the competitors scratching their heads.  It is formed using their patented, dual diameter pipe and wrinkle-bend technologies.  The Million-Air heat exchanger is built to last.  The industry standard (ANSI Z21.47) requires that all heat exchangers pass a 10,000 cycle stress test without failure.  Amana began running the test on a Million-Air heat exchanger back in 1996  and that heat exchanger has surpassed over one million extreme temperature test cycles and is still going strong!  The durability of this heat exchanger is one of the reasons we know that Amana brand furnaces will last for many years to come.

Amana pioneered and perfected the tubular heat exchanger design.  The Million-Air heat exchanger has the benefit of superior materials and patented technologies making it extremely durable.  The Million-Air heat exchanger is made of 409 stainless-steel tubing and is formed using a precisely engineered process.  How the tubes are bent is critical.  Some manufacturers just bend the tubing, thus stretching the metal on the outside of the tube while compressing the metal on the inside.  Amana's patented process carefully forms the tubing to create precisely place wrinkles to reduce the likelihood of weak points in the metal.  The wrinkles have an added benefit...they cause turbulence inside the tube, forcing more heat to the tube walls for even greater efficiency.  With dual-diameter tubing, heat transfer is maximized.  As hot gases pas from the larger to the smaller diameter tube, the velocity of the gas increases.  This ensures the best possible heat transfer to the home.  Competitive designs typically use a single diameter of tubing.  That's why they crimp, crush or pinch the tubes in order to create turbulence and improve heat transfer but these techniques weaken the metal and add stress that make the metal much more prone to cracking or breaking.  Where the tubes are joined the Million-Air takes advantage of the properties of thermal expansion.  The larger tube is drawn to a smaller diameter and fitted inside the smaller tube.  During operation, the larger tube is hotter and therefore the joint actually becomes more solid.   

Unlike warranties that provide a replacement heat exchanger for a certain length of time, Amana is so confident in their furnaces and the Million-Air heat exchanger that they offer a lifetime replacement of the entire furnace if the heat exchanger ever fails on the original, registered owner!  As of yet, no competitor has matched this warranty.  For complete warranty details please visit www.amana-hac.com.

For this and more information about the Amana brand Million-Air heat exchanger, please visit www.amana-hac.com. 

Read an article about Amana's MillionAire Heat Exchanger nearing the 2 million cycle mark.

              

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