Weil-Mclain

Built a strong reputation creating North America’s largest cast

iron boiler brand, with manufacturing in Indiana and North Carolina.

Evolved its lineup to include high

efficiency condensing and advanced hydronic boilers with smart controls and materials like stainless steel and aluminum.

Focused on residential, commercial & institutional buildings—installing systems in homes, schools, offices, hotels and restaurants.

Parented by SPX Technologies, it underwent a brand refresh in early 2025 to highlight its legacy and innovation in hydronic heating.

Notable products include the Evergreen and SlimFit condensing models, pushing efficiency and installer

friendly design.

Historically pioneered innovations such as the first wet

base boiler and factory

assembled sections for reliability and ease of use.

Maintains administrative headquarters in Illinois with manufacturing plants in Michigan City, IN and Eden, NC.

Contractor‑first approach

Trusted partner providing added value and peace of mind

Engineering products for aesthetics, functionality, safety and structural tolerance

Commitment to quality, durability and innovation

Delivering 'Solutions that Matter™'

Manufacturing net

zero target: zero

carbon goal not explicitly stated on public site