The jets make up the heart of any hot tub or spa. When looking to purchase a hot tub, make note of the number and type of jets available on a particular tub. Some manufacturers offer only a high-speed water jet and a whirlpool-type jet. Others offer eight or nine different specialty jets so that the water can do what you want it to do. An example of a specialty jet would be a massage jet, designed to massage your back as you sit in the hot tub. The next time you are at your local home warehouse-type store, if they sell hot tubs, make note of the number of jets in the tubs. Most low-priced, ready-to-purchase tubs will come with 15 to 30 jets. Higher-priced tubs may allow you to choose the number and types of jets in your tub. Many top of the line tubs have 100 or more jets.