Swim Spa Types Explained: Jet vs. Propeller, Dual-Temp, and Therapy Pools

Swim spa is one phrase covering several quite different machines. This post is about the mechanical differences, because they explain both the price spread and whether a given unit will suit you.

How the current is made

This is the main divide.

Jet-driven current uses pumps pushing water through nozzles. It is the cheaper, more common approach and it is perfectly effective for resistance walking, aqua exercise and casual swimming. At higher settings it can become turbulent, and some swimmers find the chop distracting over a long session.

Propeller-driven current moves a far larger volume of water at lower pressure, which produces a smooth, wide, consistent flow much closer to open water. It is what a competitive or serious swimmer wants. It is also substantially more expensive to build, which is a large part of why our Endless Pools X2000 carried a $64,999 MSRP.

If you are training rather than exercising, this is the specification to care about above all others.

Single temperature versus dual temperature

A single-temp swim spa is one body of water at one temperature. You compromise between swim temperature, which most people want cooler, and soak temperature, which most people want around 100 to 102 degrees.

A dual-temp unit holds a swim section and a separate spa section at different temperatures simultaneously. Two heaters, two circulation systems, effectively two machines sharing a cabinet. Genuinely useful if one person exercises while another soaks. Money wasted if nobody in your house wants that.

Swim spas versus therapy pools

Not all long shells are built for swimming.

A therapy pool such as the Master Spas Therapool is designed for warm water movement rather than lap work: room to walk, stretch and do resistance exercise, held at therapy temperature, with a floor you can stand on throughout. It is aimed at joint pain, rehabilitation and getting older comfortably rather than at swim training.

A trainer style unit such as the Trainer 15 D leans the other way, toward swimming and fitness. Same category on paper, different machine in practice.

Length, depth and what you can do in there

Shells run from around twelve feet to nineteen or more. Because you swim against a current rather than covering distance, length matters less for swimming than people assume. It matters a lot for everything else: walking, stretching, two people in the water at once, and whether it feels like a lane or a room.

Depth determines whether you can do proper resistance work standing up, and whether a taller person can swim without scraping the floor.

The practical specifications people skip

Insulation quality, because more water means more to heat and a poorly insulated swim spa is expensive to own in winter. Cover design, because a large cover you cannot manage alone is a cover you will resent. Step and rail placement, which matters enormously if part of the reason you are buying is mobility. And equipment access, because everything eventually needs service.

Come and try the current

Descriptions of water movement are close to useless. Stand in one. It takes thirty seconds to know whether a jet-driven current suits you or whether you need a propeller.

3289 TX-101, Bridgeport. Call 936.333.0770 or email sales@txspaguy.com.

Related: Swim spas on the floor