The RB4 is Ideal for active households wanting both exercise and relaxation in one compact swim spa.

The American Whirlpool RB4 features 4 Turbo Swim Jets, providing a strong, adjustable current perfect for gentle swimming, resistance training, or water aerobics. Stacked in a 2x2 grid, the jets give a deep flow of water for a fuller body workout. Designed with comfort in mind, it also includes integrated hydrotherapy seats for post-workout recovery or casual soaking. Its premium insulation, LED lighting, and touch screen controls deliver year-round usability and efficiency. Whether you're easing into daily fitness or creating a backyard wellness hub, the American Whirlpool RB4 swim spa offers a practical, all-in-one solution for your health and fitness needs.

As well as being a great fitness spa, the RB4 is also perfectly suited to being a large tub for socialising in. It has three dedicated hot tub hydrotherapy seats at one end, each with unique jet arrangements to give a range of massage effects. Six additional bench style seats add to the spas capacity with three seats on either side. Each of these side seats has a dedicated massage jet, each set at a different height (high, mid and low) so everyone can benefit from hydrotherapy in a way that suits them.

Looking for more options?

The American Whirlpool MB4 is the more powerful sibling to the RB4. It features an identical layout and design but builds in an extra 3HP pump and MAAX Force jet swim propulsion system a greater current to exercise against.

If you like the features on this model, but would like a larger floor area for exercise or just to move around in, the American Whirlpool RL4 swaps the bench seats along each side for a wider floor area. Wall mounted jets keep the same levels of hydrotherapy throughout the spa.

Other spas perfect for larger groups or doing gentle exercise in include the Icelandic Wellness Fossa 3B and American Whirlpool RL5.

Key Features