Jacuzzi is a private company that manufactures and markets hot tubs, pools, and other bath products. It is best known for the Jacuzzi hydrotherapy products. Headquartered in Irvine, California, USA, it is the largest hot tub manufacturer in Europe and has eight factories, the largest in Italy. The company was founded in 1915 by seven brothers from the Jacuzzi family. It developed a variety of products including pumps for agricultural use. In 1948, Jacuzzi created water pumps to treat a family member's rheumatoid arthritis. The water pumps were a niche medical product until they were integrated into a recreational hot tub in 1968. As the popularity of hot tubs grew, Jacuzzi created more models that were more advanced. Jacuzzi was family-run until 1979, after which it then changed hands several times, before being bought by its current owner Investindustrial in 2019. The Associated Press Stylebook lists Jacuzzi is a trademark brand for products like hot tubs, whirlpool spas, and whirlpool baths and it may not be legal to use the name in a commercial context without permission. History Beginnings Jacuzzi was founded by seven brothers in the Jacuzzi family: Giocondo, Frank, Rachele, Candido, Joseph, Gelindo, and Valeriano. Their original last name was Iacuzi, but when the first two brothers immigrated from Italy to the US in 1907, immigration staff misspelt their name "Jacuzzi". All seven brothers had immigrated by 1910. More family members immigrated to the U.S. when the brothers won a contract to provide propellors to the U.S. for World War I planes. Jacuzzi began as a machining company. The brothers worked on a citrus farm owned by an early aviation inventor. They offered to help develop aviation products, creating an early wood propeller that was curved instead of flat and was used in World War I. One of the first propellers they made is now on display at the Smithsonian Institute. They also developed one of the first fully-enclosed cabins for airplanes, called the Jacuzzi J-7, which was used to transport mail. In 1921, a mail plane crashed, killing all of the passengers on board, including Giocondo Jacuzzi. After the crash, the brothers abandoned the aviation industry and experimented with several other products, the first successful one being was a water pump created by Rachele Jacuzzi in 1926. The product line then expanded to include a variety of pumps. Hydrotherapy In 1948, Candido Jacuzzi developed the first hydrotherapy