Once you have decided a swim spa is the right call, the next question is which series. Endless Pools builds three: the E-Series, the X-Series, and the R-Series. They are not simply good, better, and best. They are built around different priorities. The E-Series is engineered for serious swimming, the X-Series for fitness and family use, and the R-Series for recreation and value. The right one depends on what you plan to do in the water and how much backyard you have to give it.
Here is how the three differ in practice.
| Series | Current system | Best for | Underwater treadmill |
|---|---|---|---|
| E-Series | Hydrodrive (smooth, adjustable) | Serious lap swimmers and triathletes | Yes |
| X-Series | Swimcross airless jets, variable resistance | Fitness and family use | No |
| R-Series | Balanced recreation current | Recreation, relaxation, and value | No |
The current is the real difference
Every swim spa creates a current you swim against, but how it does that changes the experience more than any other feature.
The E-Series uses Endless Pools’ Hydrodrive technology, a smooth and adjustable current designed to feel closer to open water swimming. If you are training with real stroke mechanics rather than splashing around, this is the one built for you.
The X-Series uses the Swimcross current system, an airless four jet setup with variable resistance. It is well suited to recreational swimming, resistance work, and general fitness rather than dedicated lap training.
The R-Series is built around a balance of recreation, relaxation, and resistance, aimed at families who want the swim option without needing the top tier current system.
If you have never swum against a current before, this is the single best reason to visit in person. Two systems can look similar on paper and feel completely different once you are in the water.
Size and footprint
Swim spa footprints matter in Bakersfield yards, where the pad, the access route, and the setback all have to work.
Both the E-Series and X-Series include 20 foot dual temperature models, which let you keep the swim zone cool and a separate hydromassage zone warm at the same time. That dual temperature setup is the closest thing to owning both a pool and a hot tub in one shell, and it is also the largest footprint in the lineup.
There are shorter options in both series as well, including a 15 foot variable speed model in the X-Series and a 17 foot model in the E-Series, plus an extra wide E-Series option that trades length for swim width. If space is your binding constraint, start by measuring the pad area and the gate or side yard the unit has to travel through, then work backwards to the models that fit.
We can confirm current dimensions and delivery access requirements for any model before you commit.
Fitness accessories change the calculation
If you are buying primarily for exercise, check accessory compatibility before you choose a series. The Endless Pools underwater treadmill is available on E-Series swim spas only, which is a genuine decision point for anyone who wants low impact walking or running as part of their routine.
Other accessories are more widely available, including the Aquabike and resistance band exercise kits. The X-Series includes built in anchors for resistance band work, and there is room for the Aquabike in several models.
How to narrow it down
A rough rule of thumb:
- If lap swimming or triathlon training is the point, look at the E-Series first, especially if the underwater treadmill matters to you.
- If you want a mix of fitness, family use, and hydromassage without needing the top tier current, the X-Series is usually the sweet spot.
- If the swim spa is mostly for family recreation and relaxation with resistance as a bonus, start with the R-Series.
Whichever direction you lean, you can browse the full Endless Pools swim spa lineup or go straight to the E-Series, X-Series, and R-Series pages to see the models in each.
Common questions
What is the difference between the E-Series and the X-Series?
Primarily the current system and the fitness accessory options. The E-Series uses the Hydrodrive current and supports the underwater treadmill. The X-Series uses the Swimcross airless jet current with variable resistance and built in anchors for resistance band work. Both offer 20 foot dual temperature models.
Which Endless Pools swim spa is best for serious swimmers?
The E-Series is the line engineered around swim performance, with the smoothest and most adjustable current in the lineup. If you swim with real stroke mechanics rather than for recreation, start there.
What is a dual temperature swim spa?
It is a swim spa with two separate water zones, so you can keep the swim area at a cool exercise temperature and a separate seating area at hot tub temperature at the same time. Both the E-Series and X-Series include 20 foot dual temperature models.
Can I try a swim spa before buying?
Yes. We offer test swims so you can feel the current before you decide, which is the most reliable way to compare series. Call ahead so we can have the water ready for you.
Come test swim before you decide
Reading about current systems only gets you so far. The fastest way to know which series is right is to get in the water and swim against each one. Stop by the showroom, or request pricing and we will walk you through the options that fit your space. Our swim spa FAQ covers the practical questions on install and upkeep, and if you are still weighing the bigger decision, our post on swim spas versus in-ground pools is a good place to start.
4301 Yeager Way, Bakersfield, CA 93313
(661) 396-8827
Mon to Fri 10am to 6pm, Sat 10am to 5pm, closed Sunday
