A. O. Smith Corp (AO Smith) is a water technology company, which manufactures and markets water heaters, boilers, tanks, and water treatment products. It also provides in-home air purification products. The company markets products under the A. O. Smith, Lochinvar, and Aquasana brands. The company primarily operates through two segments: North America and the Rest of the World. The major product lines include Boilers and Related Parts, Water Heaters and Related Parts, and Water Treatment Products.

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AO Smith conducts R&D to enhance competitiveness by generating new products and processes. The company's R&D initiatives are carried out at the Corporate Technology Center in Milwaukee, Wisconsin, the Global Engineering Center in Nanjing, China, and various operating locations. These centers are responsible for managing the company's R&D activities and contributing to the development of new products and processes. In FY2025, the company spent US$95.0 million on R&D, which accounted for 2.5% of the company’s revenue.