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About Us

Weil-McLain, a division of The Marley-Wylain Company, is a leading North American designer and manufacturer of hydronic comfort heating systems for residential, commercial and institutional buildings since 1881. We have manufacturing facilities in Michigan City, Indiana and Eden, North Carolina, along with regional sales offices throughout the United States and an administrative office in Burr Ridge, Illinois. Building on a reputation of quality and innovation, we are committed to creating Simplified Solutions for our Complex World.

Architects, engineers, contractors, facility managers and homeowners alike rely on us for their comfort heating needs. Installed in homes, offices, schools, restaurants, hotels and other facilities throughout North America, the Weil-McLain brand is among the most respected and often used in the building industry.

Our hydronic boilers and indirect-fired water heaters integrate the latest in advanced controls and materials including cast iron, stainless steel and aluminum heat exchanger technologies. The reliability and energy efficiency of our products has helped to make us industry leaders.

Products are engineered with aesthetics, functionality, safety and structural tolerance in mind. By combining our expertise with the responsiveness of our support operations, we provide our customers with added value and peace of mind.


Founded in 1881 in Chicago by Isadora and Benjamin Weil, Weil-McLain was originally named Weil Brothers.

In 1918, after acquiring a main supplier, J.H. McLain Company, the company was renamed Weil-McLain and boiler plant operations moved to Michigan City, Indiana.

Throughout the 20th century, Weil-McLain grew to be the largest U.S. manufacturer of cast iron boilers and a leader in the hydronic industry.


In 1999, Weil-McLain expanded its boiler line and entered the oil furnace market by acquiring Williamson Thermoflo.

In 2005, after outgrowing the original Michigan City manufacturing facility, Weil-McLain opened a manufacturing plant and distribution facility in Eden, North Carolina.

In 2012, Weil-McLain opened an administrative office in Burr Ridge, Illinois (a suburb of Chicago). The Michigan City, Indiana location continues its cast iron foundry operations and houses a state of the art laboratory and testing facilities alongside an engineering and development center.

Today, Weil-McLain maintains its status as a leader in hydronic heating with approximately 600 employees focused on providing Simplified Solutions for our Complex World.