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We looked at every inflatable hot tub in our range that is in stock and priced under £400, then checked the makers' specs rather than relying on the listing titles. Four made the cut as the best inflatable hot tub options at this price. Three are from Lay-Z-Spa, the Bestway-owned brand that dominates the UK inflatable market, and one is from Aoxun, a newer name that gives you a bigger hot tub for the money.
These figures come from the product data we hold for each hot tub, checked against the manufacturers' published specs. Water volume is at the 80% fill line most makers quote.
| Model | Shape and size | Seats | Water | Jets | Extras |
|---|---|---|---|---|---|
| Lay-Z-Spa Cancun AirJet | Round, 180 x 66cm | 2-4 | 669 litres | 120 AirJets | Freeze Shield, ChemConnect, built-in RCD |
| Lay-Z-Spa Boracay Smart AirJet | Round, 180 x 66cm | Up to 4 | 669 litres | 120 AirJets, 2 levels | WiFi app, Freeze Shield, locking cover |
| Lay-Z-Spa Palm Springs AirJet | Round, 196 x 71cm | 4-6 | 916 litres | 140 AirJets | Digital panel, TriTech walls |
| Aoxun Inflatable Hot Tub | Round, 208 x 65cm | 4 | 1,000 litres | 130 air jets | 1,800W heater, 4 filters, ground sheet |
Just over budget, the Lay-Z-Spa Aruba (170cm, 3 adults, 800 litres, 110 AirJets) and the Arebos Tenerife (185cm square, 6 seats, 910 litres, 130 jets) are worth a look in our cheap hot tubs under £500.
At this price, every hot tub heats to 40°C and has bubble jets, so the differences are in the details that decide how much you enjoy it after the first month. We ranked each hot tub on:
The best hot tub for you depends mostly on how many people will use it. If it's two of you, a 180cm model is plenty and cheaper to heat. If it's a family, go bigger.
The Cancun is the safe choice and, for most buyers, the best hot tub in this price band. It holds 669 litres, seats two adults with plenty of legroom or four who don't mind getting cosy, and its 120 AirJets bubble up from the floor ring all the way round. Bestway rates it at 2,050W, it inflates in under five minutes and filling takes around two and a half hours from a garden hose.
You also get the extras that matter on a budget hot tub: Freeze Shield, a ChemConnect chemical dispenser, a ground detection system with a built-in RCD, an insulated lid and a repair patch. With a 4.5-star rating from more than 1,500 Amazon reviews, it has the longest track record of anything here.
The Boracay is the same 180cm round size, with the same 669 litres and 120 AirJets, but adds WiFi control through an app. The real benefit is timing: start the heater from your phone at lunchtime and the water is warm when you get home, instead of running it all day. It also has two massage intensity levels and a reinforced locking cover.
If four adults will regularly share the hot tub, size up. At 196cm wide and 71cm deep, the Palm Springs holds about 916 litres - roughly a third more than the 180cm models - and its 140 AirJets cover a bigger floor. The deeper wall means the water comes higher on your shoulders. The trade-off is a longer first heat and more chemicals per fill - it's the best hot tub here for a family, but not the cheapest to run.
The Aoxun is the largest hot tub in this price band: 208cm across with 1,000 litres, 130 air jets and an 1,800W heater. It comes with four filter cartridges, two mesh filter nets, a ground sheet and an insulated cover, plus a 2-year warranty. Be aware that it has no Amazon reviews yet and the maker recommends 250 x 250cm of floor space. If you want a known name, the Palm Springs is the safer large pick.
Makers quote the most people who can physically fit. In practice, a 180cm hot tub is comfortable for two adults and fine for four; a 196cm hot tub is comfortable for four and squeezes six. For a couple, our 2 person hot tubs are cheaper to heat. For bigger households, see our 6 person inflatable models.
Every pick here is round, which spreads bathers evenly and works best on small patios. A square hot tub will tuck into a corner and give more bench length per side. Browse round hot tubs to compare the full range.
AirJets blow bubbles through holes in the floor ring. They feel fizzy and relaxing rather than deep-tissue. HydroJets push water through directional nozzles in the wall for a firmer massage, but they add cost and usually push a hot tub well past £400. At this budget, AirJet is what you'll get.
Look for a three-layer wall. Lay-Z-Spa calls it TriTech or DuraPlus: laminated PVC with a polyester mesh core that resists punctures and stretching. Single-ply walls are cheaper but sag and leak sooner.
The lid is the biggest factor in how fast a hot tub loses heat. A thick, buckled-down cover keeps warmth in and leaves and rain out. A thermal ground mat underneath helps too, especially on cold paving.
Freeze Shield switches the heater on automatically when the water drops to about 6°C and holds it around 10°C, so the pipes and pump don't freeze. It only works while the spa is plugged in and switched on. If you plan to leave it up through winter, this is the feature to insist on - all three Lay-Z-Spa picks have it, and it's one reason they rank as our best inflatable hot tub choices.
The first heat costs the most because you're warming a full hot tub of cold mains water. Heating a litre of water by one degree takes 4.186 kilojoules. So taking 669 litres from 12°C to 38°C needs about 20kWh. At the October 2026 price cap rate of 26.32p per kWh (Ofgem), that's roughly £5.30 before any heat is lost through the walls.
| Hot tub | Water | First heat (12°C to 38°C) | Cost at 26.32p/kWh |
|---|---|---|---|
| Cancun / Boracay | 669 litres | about 20kWh | about £5.30 |
| Palm Springs | 916 litres | about 28kWh | about £7.30 |
| Aoxun 208cm | 1,000 litres | about 30kWh | about £8.00 |
After that, you're paying to replace lost heat. A heater rated around 2kW costs about 53p for every hour it runs. How many hours that is depends on the weather, the lid and how often you use it. A hot tub left at 38°C through a British winter will cost far more per week than one used in summer. Three easy savings: keep the lid on and buckled, drop the temperature a few degrees between sessions, and use the timer so the heater isn't running overnight.
Heating speed is slow on every budget hot tub - around 1.5-2°C per hour - so plan the first fill a day before you want to use it.
Water weighs a kilo a litre, so the Cancun weighs close to 700kg when full, before anyone gets in. The Palm Springs and Aoxun are nearer a tonne. You need:
Warm, still water breeds bacteria, including legionella. The Health and Safety Executive lists spa pools as a known risk, so treat water care as a must-do, not a chore.
An inflatable hot tub costs a fraction of a rigid acrylic hot tub, needs no electrician or groundworks, and goes back in its box when you move. The trade-offs: thinner walls lose heat faster, AirJets are gentler than hydrotherapy jets, and a PVC liner won't last as long as a moulded shell. As a first hot tub or for a rented home, an inflatable one makes the most sense. For a softer look on the patio, our wood effect inflatable hot tubs hide the PVC behind a timber-style print.
For most people, the best inflatable hot tub under £400 is the Lay-Z-Spa Cancun AirJet: well made, cheap to heat and backed by thousands of owners. Choose the Boracay if app control is worth the extra on your hot tub, and the Palm Springs if four adults will use it often. You can find full specs for each one on the Lay-Z-Spa UK site.
For most first-time buyers, yes. You get warm water, bubbles and a social space in the garden for a few hundred pounds, with no installation. If you'll use it every week, all year round, a rigid insulated tub may save money over several years.
Most budget models warm up by 1.5-2°C an hour, so a first heat from cold tap water takes 12-24 hours depending on size, the weather and whether the lid is on.
Yes, if it has Freeze Shield or similar protection and stays plugged in. Keep the lid buckled, and expect higher running costs in cold weather. Otherwise, drain it, dry it thoroughly and store it indoors.
Take one off the maximum for comfort: a 4-person 180cm hot tub suits two or three adults, and a 4-6 person 196cm hot tub suits four.
Only if the ground is level and clear of stones and roots, with a protective mat underneath. Paving or a concrete base is better. Grass under the hot tub will die.
With good care, the liner usually lasts several seasons. The pump unit is often the first part to fail, which is why a 2-year warranty, as on all three Lay-Z-Spa picks and the Aoxun, is worth having.
Pregnant women are usually advised to avoid hot tubs at 40°C because of the risk of overheating. Speak to your midwife or GP first.
