Endless Pools vs Master Spas swim spas

Both brands sell more than one kind. Endless Pools uses a propeller in 4 models (E-Series) and jets in 5 (R-Series and X-Series). Master Spas uses a propeller in 2 models (Michael Phelps Signature Swim Spas) and jets in 13 (H2X Challenger Series, H2X Therapool Series and H2X Trainer Series).

A propeller turns behind a grate and pushes one wide column of water. Jets fire water through a few nozzles, often with air mixed in, so the current is narrower and more broken up. What you feel is the width and steadiness of the water, not the horsepower on the spec sheet. The guide to swim spa jets vs propeller explains the trade-offs.

Endless Pools publishes the open swim area for 6 of its 9 models; the longest is 137.5 by 81 in, on the E550. Master Spas publishes outside dimensions only, so ask the dealer how long the open water is.

Outside lengths run 12 ft to 20 ft for Endless Pools and 11 ft to 21 ft 5 in for Master Spas. By length class, Endless Pools has 2 in the 12-foot class, 4 in the 14-foot class and 3 in the 16-foot class; Master Spas has 4 in the 12-foot class, 4 in the 14-foot class and 7 in the 16-foot class. At the dealer, lie out in an empty display of the model you would buy, arms overhead: your feet shouldn't reach the seats. See swim spa sizes, 12-foot swim spas, 14-foot swim spas and 16-foot swim spas, and best swim spas for lap swimming.

Water held runs 1,080 to 2,395 gallons for Endless Pools and 925 to 2,445 for Master Spas. More water means more to heat, treat and carry: have a builder or engineer check the pad or deck for the filled weight.

Endless Pools' models call for 30 to 60 A in total on 1 circuit; Master Spas' call for 50 to 130 A on 1 to 3 circuits. The top of each range is the X2000 and the MP Momentum D. A licensed electrician sizes the circuits for the model you buy. See swim spa electrical requirements.

Master Spas, on the filings we matched: a median 462 W for Endless Pools' 7 filed models against 306 W for Master Spas' 7. That is about 337 and 223 kWh a month just holding temperature. Length and cover change the figure, so compare the model you would buy. The swim spa running cost guide explains the test.

Endless Pools' structure warranty runs 10 years, equipment 3 to 5 years; coverage does not transfer. Master Spas' structure warranty runs 7 to 10 years, equipment 3 to 5 years; coverage does not transfer. Read the warranty card for labor and the swim system itself, which some makers cover for less time than the shell.

Master Spas reported prices run from $25,499 to $54,499 (September 2026). Endless Pools posts list prices from $26,499 to $74,999 (checked Oct 2026). Swim spa cost covers delivery, the pad and the electrician.

Endless Pools belongs to Masco Corporation, the same owner as Hot Spring and Caldera. Master Spas is privately held. Where each builds its swim spas, and who services them:

• Endless Pools. Sold and serviced through about 250 dealers; Endless doesn't say where its swim spas are built.
• Master Spas. Built in Fort Wayne, Indiana with U.S. and imported parts and sold through dealers; warranty service starts with the dealer who sold it, and whether that dealer has its own technicians and parts on hand isn't published.

Every swim spa we track is listed by brand: Endless Pools swim spas and Master Spas swim spas. Weighing one against a hot tub? Read swim spa vs hot tub, and for picks across brands, best swim spas.