Headquartered in Ashland City, A. O. Smith is a leading manufacturer and marketer of residential and commercial water heaters and hydronic boilers. A. O. Smith’s selection of residential and commercial water heaters, boilers, and storage tanks is unmatched for quality and diversity. A. O. Smith can provide an energy-efficient solution with maximum value during and for years after installation.

American Residential Services (ARS) is a brand of American Residential Services LLC., which provides heating, air conditioning, indoor air quality, plumbing, drain cleaning and sewer line services from company-owned locations across the United States of America (USA). United by exceptional service, the ARS® / Rescue Rooter® Network serves both residential and light commercial customers.

Redwood Services' mission is to support its local partners with shared resources, access to capital and best-in class operating systems and processes – all designed to drive long-term, profitable growth. Founded in 2020, with the backing of the Union Main Group, Redwood Services is actively investing in ‘mission critical’ home services companies, including HVAC, plumbing, and electrical.

In 1946, State Water Heaters was founded by Herbert Lindahl, Sr. as a small entrepreneurial company producing coal and wood-burning stoves in a garage in Nashville, Tennessee. In the years that followed, State expanded and became a leader in the water heating industry, through steadfast commitments to seeking new materials, new technology and innovative engineering techniques.