A swim spa looks like a hot tub from the brochure photograph. Get to the showroom and stand next to one, and it looks considerably less like a hot tub. Most are between four and six metres long, weigh between 2,500 and 4,000 kilograms when full, and cost two to four times as much as a well-specified hot tub. The seating jets are real, the warm water is real, but so is the rest of it. This guide is for anyone who has started wondering whether they should be looking at swim spas instead of hot tubs, and wants an honest answer.
What a swim spa actually is
A swim spa combines a jet-current swimming area with a seating section at one end. You swim against the current rather than doing laps. On dual-zone models, the two sections run at different temperatures: you can keep the swim area cooler for training and the seating end at hot-tub temperature for relaxing. On single-zone models, the whole unit runs at one temperature, which means compromising in one direction or the other.
The swim current is generated by one or more propeller or jet systems. On cheaper units, the current can be turbulent and hard to swim in. On a well-built unit, it is smooth enough for consistent training. The difference in current quality is significant, and it is one of the things worth checking carefully before you buy.
The seating section works like a hot tub. Hydrotherapy jets, heated water, room for two to four people depending on the model. If you only ever used that end, you would have a reasonable hot tub experience. But you would have paid swim spa money for it.
Size and weight
A typical 4-person hot tub holds around 1,000 to 1,400 litres of water and weighs roughly 1,200 to 1,600 kilograms when full. It fits on a standard reinforced patio.
A swim spa holds 2,500 to 4,000 litres or more. Fully loaded, you are looking at three to four tonnes sitting on whatever surface you have prepared. That is a different structural calculation. Many gardens require groundworks that a hot tub installation would never need. Crane access is sometimes the only practical delivery method, particularly for side returns and enclosed rear gardens. If your access is tight, this matters early in the decision process, not after you have ordered.
The footprint is also fixed and large. A six-metre swim spa in a small garden is not a feature. It is the garden. If you have a modest outdoor space, the decision may make itself.
Who swim spas are actually for
They suit a specific buyer, and that buyer is not the majority of hot tub customers.
- Serious swimmers. If you swim regularly now and want to maintain or build on that at home, a swim spa with a good current system gives you a genuine training tool. Former club swimmers. Triathletes. People recovering from injury who have been advised to swim. This is where swim spas earn their place.
- Families with children learning to swim. A swim spa at a stable current level is useful for teaching children who are not yet confident in open water. You control the conditions. It works year-round.
- People who want both functions and have the space and budget for both. If you genuinely want daily swimming and evening relaxation, and your garden can accommodate one, a dual-zone swim spa does both jobs adequately. Not perfectly in either direction, but adequately.
Who swim spas are not for
Most people asking about swim spas end up in a hot tub. That is not a failing on their part. It usually reflects an honest assessment of how they actually live.
- People who mainly want to relax. A hot tub does this better and costs significantly less. The seating section on a swim spa is good. The seating section on a dedicated hot tub, at equivalent spend, is better: more jets, better placement, more thought put into the thing you are actually there for.
- People with small gardens. If the swim spa takes up half your usable garden, you will stop enjoying the garden. The trade-off is real.
- People on a tighter budget. Swim spas start at around £15,000 and rise quickly. Running costs are higher too: more water to heat, larger pumps, higher electricity draw. A well-insulated hot tub from £5,995 is a better financial decision for someone who does not need the swim function.
- People who think they might swim occasionally. Occasional is not the same as regular. See the honest test below.
The honest test
If you would not join a gym specifically to use their pool, you probably will not use a swim spa’s current enough to justify the cost. Ask yourself: do you swim now? Not “I used to” or “I keep meaning to.” Do you swim today, as part of your life? If the answer is no, a hot tub is almost certainly the better buy.
This is not a dig at swim spa buyers who later discover they do not swim. It is the question a decent salesperson should ask before letting someone spend £20,000 on something they will not fully use. We would rather you bought the right thing and came back when you wanted to upgrade or recommend us to someone. We would not rather you felt oversold in six months’ time.
Cost: the full picture
Hot tubs from our range start at £5,995 for a VitaSpa 100 Series. A well-specified family tub sits between £8,000 and £14,000 installed. Running costs for a well-insulated hot tub are typically £30 to £50 per month.
Swim spas start at around £15,000 and the better dual-zone models are £20,000 to £30,000 and above. Running costs are higher because you are heating a much larger body of water. Expect to pay noticeably more per month than a hot tub of equivalent build quality. The base installation cost is also higher: bigger concrete base, higher electrical supply (often three-phase or a significant single-phase upgrade), and potentially crane hire on top.
Finance is available for both if it suits your situation. We do not encourage people to size up with finance. The question is which product fits how you actually live, not which one you can stretch to.
The dual-zone vs single-zone question
If you are committed to a swim spa, this decision matters. A dual-zone swim spa has a physical barrier between the swim section and the seating section, with separate heating for each. You can train in cooler water (around 26 to 28 degrees is typical for swimming) and soak in hotter water (37 to 40 degrees) at the same time or separately. This is the most practical design for a household where one person wants to swim and another wants to relax.
A single-zone swim spa runs everything at one temperature. If you set it at 38 degrees, you will get hot quickly when swimming. If you set it at 28 degrees, the seating end is cooler than most people want for relaxing. Single-zone swim spas are cheaper. For most buyers who want both functions, the dual-zone design is worth the difference.
Hybrid alternatives worth considering
Some larger hot tubs include resistance bands, rowing bars, or exercise jets that allow some in-water fitness work without being a full swim spa. These are not a substitute for genuine swim training, but they are worth knowing about if you want light exercise built into your tub without the footprint or the cost of a swim spa. Ask us in the showroom and we can show you what is available at a given budget.
What we sell
Our swim spa range includes the Reef Spas Cayman, a dual-zone model with a genuine training current and a full four-person seating section. The Cayman is built on Reef Spas’ standard engineering platform, which shares design thinking with the VitaSpa range. It is the swim spa we would buy ourselves if we needed one.
On the hot tub side, the VitaSpa range covers six series from the 100 Series at £5,995 through to the 700 Series at £19,995, with spec that scales sensibly at each step. If you are not sure where in that range your budget and needs meet, that is exactly what a showroom visit is for.
The straightforward summary
Buy a swim spa if you swim regularly now and want to keep doing so at home, you have the garden space, and you have accounted for the full installation and running cost. Buy a hot tub if you mainly want to relax, your garden is modest, or you are not certain the swim function will get regular use. If you are somewhere in between, come and see both in person. Standing next to a swim spa answers most questions that a brochure does not.
We are in the showroom most days. There is no obligation and no script. If you tell us how you live, we will tell you which way to go.