Weil-McLain offers a complete line of commercial gas boilers tailored for water applications 220 - 8,660 kBTU/hour in natural draft or forced (power) designs with thermal efficiencies up to 96%. Available in natural gas or propane configurations, packaged or knock-down heat exchanger for boiler room assembly - Weil-McLain Commercial Gas Water Boilers provide quiet, low-maintenance and cost effective heating solutions for light commercial through large institutional applications.