The swim spa industry is populated by several brands, each of which offers a unique blend of features and functionality across several product lines. If you have been shopping in 2026, three names keep coming up: Catalina Luxury Spas, Master Spas, and Endless Pools. All three sit in the premium end of the category, and all three build units you can swim, exercise, and soak in year-round. But they were built around different priorities, and choosing between them has less to do with which is objectively better and more to do with what you actually want the water to do for you.

This guide breaks down the key differences so you can decide which brand best fits your backyard, your budget, and how you plan to use the spa once it is installed. If you are weighing hot tubs rather than swim spas, the same three-way comparison applies to the luxury hot tub category as well. 

Quick Comparison: Catalina vs. Master Spas vs. Endless Pools

Inside Catalina Luxury Spas

Catalina is the better fit for shoppers who want a hydrotherapy-focused swim spa backed by American manufacturing and a nationwide service network, including:

• Homeowners who want hydrotherapy and pain relief as much as swim capability
• Buyers who value factory-direct pricing without giving up premium features
• Shoppers who want to see the unit in person before buying
• Owners who care about who answers the phone in year eight

Catalina Luxury Spas has built swim spas since 1980 and owns the original swim spa line, refining the category ever since. As a subsidiary brand of LPI, the largest hot tub and swim spa manufacturer in the United States, Catalina backs its spas with manufacturing scale and in-house quality control rather than outsourced assembly.

Systems and Capabilities: Catalina swim spas are built around both swim capability and hydrotherapy support for muscle recovery, with patented Catalina jets, therapy seating, and standing body massage on select models. Touchscreen controls and integrated circulation technology are standard across the range.

Size Range and Features: The lineup covers a small patio through a full backyard installation, from the compact 12.6 ft Newporter and 14 ft to 16 ft Catalina Monterey up through the 16 ft to 18 ft Catalina and the 21 ft Marathon Dual Temp, and length drives most of the decision for buyers choosing between footprints. Standard and optional features include LED-lit jets, UV sanitation, Wi-Fi, Bluetooth audio with subwoofer, water fountains, LED backlit magnetic pillows, and LED floating crystal balls. All Catalina swim spas are 220v.

Build Quality and Materials: The acrylic shell is paired with the Eternitree forever frame and SynthaWood skirting. Plumbing uses anti-fungicide tubing throughout to reduce bacteria buildup in the lines. Structural coverage runs 10 years.

Year-Round Usability: Catalina swim spas are usable year-round with strong cold-weather support, and dual-temperature models hold the swim side and spa side at separate temperatures. The optional AnyTemp Chiller heats or chills on demand, which extends usability into summer as well as winter.

Pricing and After-Sale Support: The factory-direct model means no dealer markup between the manufacturer and the customer, and prices are posted online rather than quoted in a showroom. In-house financing is available with a 100% approval rate regardless of credit history. White glove backyard delivery and a nationwide service network handle the spa after the sale. 

Verified customer reviews found on aqualivingreviews.com and whisperoutdoorreviews.com offer perspective on how owners rate construction, durability, and post-purchase service.

Inside Master Spas

Master Spas is the better fit for shoppers who want a fiberglass shell and prefer buying through a local dealer, including:

• Buyers who prefer working with a dealer in their area or travelling show team
• Shoppers who specifically want fiberglass rather than acrylic
• Buyers drawn to the Michael Phelps brand association
• Families who want a dual-zone unit that separates swimming from soaking

Master Spas has built swim spas since 1996. The lineup splits into two brands: the Michael Phelps Signature Swim Spas line and the H2X Fitness Swim Spas line, both combining pool, hot tub, exercise space, and hydrotherapy into a single unit.

Systems and Capabilities: The Michael Phelps line uses a propeller-driven current, while H2X uses jetted propulsion at a lower price point. Most H2X models include rowing bars and resistance tubing.

Size Range and Features: The combined lineup runs roughly 12 ft to 21 ft. Michael Phelps offers the MP Signature Pro and MP Momentum D, while H2X splits into three series: Challenger, led by the 21D; Trainer, including the 15; and Therapool for smaller spaces. Features include Bluetooth audio with up to four speakers and a subwoofer, waterline LED lighting, and a therapy cove aimed at back, hips, thighs, and calves.

Build Quality and Materials: Shells are hand-rolled fiberglass with fully clamped plumbing.

Year-Round Usability: Year-round use depends on the dual-temperature-zone option, which holds the swim area at one temperature and a separate hot tub section at another. Single-zone models run at one temperature only.

Pricing and After-Sale Support: Sales and service run through an independent dealer network rather than factory-owned stores, so the ownership experience depends on which dealer you buy from. Pricing is quoted by that dealer rather than published.

Inside Endless Pools

Endless Pools is the better fit for shoppers planning a custom or recessed installation, including:

• Buyers planning an indoor or partially recessed install
• Shoppers who want an underwater treadmill or aquabike
• Buyers with the budget for the higher end of the category
• Owners fitting a unit into a tight or unusual footprint

Endless Pools has operated since 1988. The units use hydraulically powered swim machines with over 100 speed settings, and the all-season cabinets can integrate with outdoor decking or garage construction.

Systems and Capabilities: Three current technologies span the lineup: Hydrodrive on the E-Series, SwimCross on the X-Series, and RecSport on the R-Series. The underwater treadmill is available on the E-Series only.

Size Range and Features: Models run 15 ft to 20 ft, from the R200 through the X2000 and E2000, with the E500 for tighter yards. Hydromassage seating, LED lighting, and Bluetooth speakers are available across the range, and accessories include an aquabike and a resistance exercise kit.

Build Quality and Materials: Spas arrive assembled and pre-plumbed, with acrylic interior components over a steel frame.

Year-Round Usability: The all-season cabinet comes in two finishes or can be customized with your own materials. The E2000 and X2000 are dual-temperature models, holding a swim zone and a separate hot tub zone at independent temperatures.

Pricing and After-Sale Support: This is the most expensive of the three, starting around $26,000 and running past $75,000 at the top of the range. Sales run through an independent dealer network, with demonstration models available at showrooms across North America.

For Swim Spas Specifically: Side-by-Side

Here is how they compare on the factors that tend to decide the purchase, including the ones that only surface years into ownership.

Which Brand Is Right for Your Backyard?

This is not a one-size-fits-all decision. Each brand occupies a different lane within the premium swim spa category.

Choose Catalina if you care most about:

• Hydrotherapy and pain relief alongside swim capability
• Factory-direct pricing with no dealer markup and prices posted online
• American manufacturing backed by the largest US spa manufacturer
• Nearly 100 showrooms where you can see the unit before you buy
• Nationwide backyard delivery, in-house financing, and long-term service support

Choose Master Spas if you care most about:

• Buying through a dealer in your area
• A fiberglass shell rather than acrylic
• Rowing bars and resistance tubing included with the unit
• Choosing from four separate model series

Choose Endless Pools if you care most about:

• An indoor, decked, or partially recessed installation
• Adding an underwater treadmill or aquabike
• A unit that arrives assembled and pre-plumbed
• Fitting a swim spa into a tight or unusual footprint

The Bottom Line

Catalina is a hydrotherapy-first swim spa brand sold factory-direct and made in the USA. Master Spas reaches buyers through independent dealers and travelling show teams, with fiberglass shells and a propeller-driven current, and Endless Pools builds swim-focused systems at the highest price point of the three.

For shoppers who want hydrotherapy and swim capability in the same unit, care about what happens after the delivery truck leaves, and want to know the price before they walk into a showroom, Catalina is the strongest pick. Factory-direct manufacturing, nearly 100 nationwide locations, and in-house financing available to any credit history make it the most accountable option in the category.

Explore the full Catalina swim spa lineup at hottub.com.

Read verified customer reviews at aqualivingreviews.com and whisperoutdoorreviews.com.