Weil-McLain is a leading North American designer and manufacturer of hydronic comfort heating systems for residential, commercial and industrial buildings.  Founded in Chicago in 1881, our hydronic boilers and indirect-fired water heaters integrate the latest in advanced controls and materials including cast iron, aluminum and stainless steel heat exchanger technologies.  With BTU ranges from 52,000 to 8,660,000 and multiple models with an AFUE rating of 95% or greater, Weil-McLain has a solution for almost every boiler application.