GSW Water Heating is Canada's leading designer and manufacturer of residential and commercial water heaters. It manufactures its products in Fergus, Ontario and employs approximately 450 people to supply a full range of products to customers in the wholesale, retail and energy services channels across Canada, as well as internationally. Although its products are sold under the flagship GSW label and the highly respected John Wood™ brand, the company is now owned by A.O Smith Corporation headquartered in Milwaukee, Wisconsin.