Endless Pools® Fitness Systems versus Michael Phelps Signature Swim Spas™ by Master Spas

Before you buy, compare these two leading Swim Spa brands.

Like any other significant investment, your new Fitness System (a.k.a. Swim Spa) deserves careful consideration. Before making a purchase, you’ll want to be sure you’re getting the most of your investment. You need the right swim spa to fit your home and lifestyle and this article is going to help you by providing an in-depth comparison of two leading swim spa brands – Endless Pools® Fitness Systems and Michael Phelps Signature Swim Spas™.

About Endless Pools® Fitness Systems

More than thirty years ago, Endless Pools pioneered a new technology that made it easier and more enjoyable to swim-at-home.  The Endless Pools swim machine was the first of its kind; creating a powerful, laminar and variable current that simulates an open-water swim in a compact space.

Endless Pools has eight models in their line of high-quality performance products intended for swimming at home and aquatic fitness. Premium models (E2000, E700, E550 and E500) use the Endless Pools Swim Machine to generate a powerful, laminar, and variable current. While the term “swim spa” is often used, it’s more accurate to refer to the product as a “Fitness System” since it’s so much more than a traditional hot tub. A Fitness System has premium options for swimming, running, walking, resistance training, recreation and relaxation – all in one.

About Michael Phelps Signature Swim Spas™

Michael Phelps Signature Swim Spas (5 models) produces a swim current so that you can swim, jog, walk, or exercise in water without the stress gravity has on your body. Massaging spa jets relieve the tension and pain that may have accumulated throughout your day. The water temperature is always perfect, because you choose it year-round.

Propulsion Systems

Endless Pools Fitness Systems and Michael Phelps Signature Swim Spas both use a propulsion system swim current generator. The system moves more water than a swim jet, without the addition of air to create resistance. The Endless Pools Swim Machine produces up to 5,000 gallons of water flow per minute, compared to the 500 gallons/minute in the Michael Phelps units.

Endless Pools Fitness Systems (E2000, E700, E550, E500) – These models use a custom-made, hydraulically-powered propulsion system that creates a laminar current of up to 5,000 gallons per minute. Water is pulled into the Endless Pools swim machine, where it is moved through an upward facing propeller. This unique positioning gives the water more time to settle down. Multiple conditioning grills then smooth and redirect the water. Finally, the flow is pushed out a honeycomb grate, which breaks up any remaining turbulence. The result is a swim current that is free of turbulence and is wider than your body and deeper than your stroke. Even at full power, it feels like swimming in open water. All models require 60 amp service, which is capable of powering the swim machine and treadmill, concurrently.

Michael Phelps Signature Swim Spasthe patent pending Wave Propulsion® Technology System delivers a deep and wide current of pure water flow with virtually no turbulence. The unique propeller design of the Wave Propulsion® System does not require air to be introduced into the water to increase its strength. This allows for a more realistic swimming experience with less turbulence and the ability to swim any stroke you want.

  • Wave Propulsion (standard)
    Standard on most Michael Phelps Swim Spas by Master Spas, the Wave Propulsion system produces almost 500 gallons of water flow per minute.
  • Wave XP Propulsion (optional upgrade)
    Optional on most models but standard on the MP Signature™, the Wave XP Propulsion system generates up to almost 1,500 gallons of water flow per minute and is ideal for anyone with a desire to train or use the swim spa as the centerpiece of their swimming routine.
  • Wave XP Pro Propulsion (optional upgrade on select models)
    Optional on only the MP Signature™ model, the Wave XP Pro requires 100 amp service and generates almost 2,000 gallons of water flow per minute. The Wave XP Pro system is ideal for those in serious training mode.

Underwater Treadmill

Endless Pools® Fitness Systems – The optional Endless Pools hydraulically powered underwater treadmill offers low-impact run, walk and exercise options. By using the the swim current concurrently with the treadmill, the flow increases resistance against core, leg, and upper body muscle groups. The treadmill has a speed range of 0.5 to 5.5 MPH.

Michael Phelps Signature Swim Spas – Underwater treadmill not available.

Fitness Applications

Endless Pools Fitness Systems – With the  Endless Pools [email protected]™ App, you can control your Fitness System using any smart device. The App allows users to easily set the pace and duration of the swim current, underwater treadmill or both.  Endless Pools also acts as a smart display allowing users to see swim and treadmill speed and duration while exercising.  Over 50 workouts can be programmed, with 20 intervals per workout.

The Endless Pools [email protected] App gives you these features:

  • Program a swim and/or run using Manual Control Mode
  • Create and save more advanced workouts with custom time and pace intervals
  • Monitor workout, with easy-to-read Display Mode
  • Guides in the App help with basic functionality
  • Increase or decrease the speed of the treadmill (0.5-5.5) or swim machine (1:08-3:43)

Michael Phelps Signature Swim Spas – the SwimNumber™ App (SNAPP) is easy to use, customize, and operate the Wave Propulsion™ System of the swim spa. It changes the speed of the water current at timed increments while user is swimming or exercising, to range from high-impact training conditions to slow cool-down speeds. Water speeds range from 0-100.

Users can design custom workouts, and the app also features preprogrammed workouts at beginner, intermediate and advanced levels. Tracking fitness progress with metrics like distance, calories, time, etc. can be easily documented and stored. You can manage stored workouts for future reference, as well as share your results on social media or via email. This app can be custom tailored for up to 12 different users, with numerous workouts for each one.


Endless Pools® Fitness Systems – All Fitness Systems feature maintenance-free cabinet and acrylic shells, designed for durability and lasting beauty.

Michael Phelps Signature Swim Spas – the sleek, European-inspired styling allows for a smoother swimming experience than other swim spas.


Endless Pools Fitness Systems – built on a 14-Gauge Galvanized Steel Frame and ABS Base Pan (Standard*), which together provide superior support and protection from ground contact.

Michael Phelps Signature Swim Spas –with a high-density polymer base that helps keep the heat in and unwanted pests out. A steel frame is offered as an optional upgrade.

General Specifications

Endless Pools Fitness SystemsMichael Phelps Swim Spa
Swim Current GeneratorHydraulically-powered propulsion systemPropulsion System
Max Gallons Per Minute (GPM)Endless Pools Swim Machine – 5,000 GPMWave Propulsion™ – 500 GPM

Wave XP – 1,500 GPM (optional upgrade)

Wave XP Pro – 2,000 GPM (optional upgrade)

Underwater TreadmillHydraulically-powered with pace range of 0.5 – 5 MPHNot Available
Workout AppEndless Pools [email protected]™ AppSwimNumber™ App (SNAPP)
Lighting SystemExterior Illumination Bar and Interior LED Points-of-LightDeluxe Waterline LED Lighting,  Wave Light Package (optional upgrade)
Water Management SystemUVC + CD OzoneOzone, Mast3pur™ Water Management System (optional upgrade)
Substructure14-Gauge Steel Frame and ABS Base PanWood Frame and High density polymer base
Optional FeaturesBluetooth®-Enabled Sound System, Resistance Bands, Row Bar Kit, Swim Tether, Endless Pools [email protected]™ Mobile and Wifi App, Pace Display, Underwater Mirror, Gecko® In.Touch 2 Wifi and Mobile App, CoolZone™ Cooling System, SwimDek® Surface KitsFusion Air Sound System, Wifi Module, SoftTread™, Nonslip, Comfort Floor System by SwimDek®, Noise Reduction System, SwimNumber App, MasterTech™ Deluxe Skirting, H2Xercise Equipment
Cover and Lifter OptionsWatkins Covers, Watkins Lifter System, ProLift® III/CoverCradle® Lifter, VacuSeal™ Cover and Lifting SystemAxis® Cover System, Master Spas Covers


Choosing your ideal Fitness System/Swim Spa

Comparing specifications is a good start in your ideal Fitness System selection, but it can’t give you the complete picture. The best next step is to visit your nearest dealer showroom to take a test swim and schedule a free backyard consultation before making a decision. Your local dealer can guide you from purchase through installation, so that it all goes “swimmingly.”


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