The MSpa Comfort Bergen is our premium inflatable hot tub: a rigid-frame six-person tub that feels closer to a fixed spa, with a built-in UVC steriliser that cuts your chemical use and the largest 930 L body on test. It costs the most here, but for buyers who want the most solid, spacious tub it earns it. Here is what it does well, and where its limits lie.
Tested April 2026 · last updated June 2026 · by Lewis Carter, outdoor leisure tester
MSpa is a brand that aims a notch upmarket of the basic round tubs, and the Comfort Bergen is its showcase for what an inflatable hot tub can be at the top of the affordable range. At around £600 it combines a rigid Quick-Up frame, which is far less wobbly than a pure drop-stitch wall, with a built-in UVC water steriliser and the largest 930 L volume of any tub here. It is the dearest tub on test and not the fastest to heat, but it feels and behaves like a more serious piece of kit, which is why it is our premium pick.
| Model | Price | Capacity | Heat-up time (15 to 40°C) | Running cost | Rating | Link | |
|---|---|---|---|---|---|---|---|
 | ★ Top pick MSpa Comfort Bergen 6-Person Inflatable Hot Tub | £1,895.00 | 6 people / 930 L | ~20 hours | ~£48 / month | ★ 4.3 | View → |
£1,895.00
6 people / 930 L · ~20 hours · ~£48 / month
The verdict from Lewis Carter, outdoor leisure tester
A polished premium inflatable hot tub. The MSpa Comfort Bergen pairs a rigid Quick-Up frame, which is noticeably less wobbly than a pure drop-stitch wall, with a built-in UVC steriliser that genuinely reduces how much chlorine you get through. At 930 L it is the most spacious tub here and the best suited to six adults rather than six in name only. The 1,800 W heater is mid-pack on reheat speed, and it is the priciest tub on test, but if you want the closest feel to a rigid spa, the Bergen earns it.
Sits firm and reassuring underfoot; the water stays clearer for longer thanks to the UVC.
The Bergen is the right tub if you want the most solid, spacious inflatable hot tub and you genuinely seat six adults, with the bonus of using fewer chemicals. At 204 cm across and 930 L it is the largest tub here, so six adults can sit without elbows clashing and four can really spread out. The rigid Quick-Up frame is the headline feel difference: where a standard inflatable wall flexes when you lean on it, the Bergen sits firm and reassuring, much closer to a fixed spa. If you want the closest experience to a hard tub without the hard-tub price, the Bergen is it.
It is less suited to two groups. At around £600 and 930 L it is both the priciest tub here and the most expensive to run, because there is the most water to heat, so a couple or a small household is paying for capacity they will rarely fill; the Bestway Lay-Z-Spa Bali or Wave Spa Atlantic would suit them better. And if outright heat retention and the lowest seasonal running cost are your priorities, the Lay-Z-Spa Paris holds heat better. For the buyer who wants the biggest, most solid tub, though, the Bergen is the standout.
The Bergen has the most water to heat, so its 1,800 W heater takes its time: from a cold 15°C fill it reached the maximum 40°C in about 20 hours, mid-pack despite the large 930 L volume, helped by the rigid frame's better-insulated walls. Heat retention was good for the size: with the lid on and the heater off it lost around 1.7°C in the first hour, behind only the Lay-Z-Spa Paris and impressive given how much water it holds. The rigid frame and thicker walls clearly help here, and they make the Bergen more forgiving in cold weather than its size would suggest.
Over a mild month of a few evening soaks a week, with the lid on, an insulating mat underneath and the heater on a timer, the Bergen cost us about £48 a month to run, the highest of any tub on test. That is the price of the largest volume here: more water means more energy to heat and to keep warm, even with good heat retention. If you fill all six seats regularly the cost per person is reasonable, but if the tub mostly sits half-empty you are paying to heat water you are not using. As always, the figure assumes a unit rate broadly in line with the Ofgem price cap.
The Bergen's two party tricks are its frame and its steriliser. The Quick-Up rigid frame inflates around the tub to brace the walls, so the structure is noticeably firmer underfoot and at the rim than a standard inflatable, and it makes climbing in and out feel more secure. The built-in UVC steriliser passes the circulating water past an ultraviolet-C lamp, which deactivates bacteria and algae; it does not replace chlorine, but in our use it clearly cut how often we needed to dose, in line with how UV-C disinfection is recognised for water treatment under standards such as those overseen by the World Health Organization's drinking-water guidance. The app is clear, the 138-jet bubble system is even, and the pump measured around 64 dB at one metre.
Two. First, it is the most expensive tub here to buy at around £600 and the most expensive to run at about £48 a month, purely because it holds the most water; unless you regularly fill six seats, you are paying a premium you will not use. Second, it is the heaviest and bulkiest tub to move and store, a consequence of the rigid frame and the larger body, so it is less of a pack-away-for-winter tub than the smaller models. Neither undermines what the Bergen is, which is the most solid and spacious inflatable here, but both are worth weighing before you buy. Observe the 40°C maximum and the soaking-time guidance in domestic spa standards such as BS EN 17125.
Best for: the buyer who genuinely seats six, wants the most solid, spacious tub and likes the lower chemical use of UVC. Not the pick if you mostly soak as a couple (try the Bestway Lay-Z-Spa Bali) or want the lowest seasonal running cost (try the Lay-Z-Spa Paris).
Two things set it apart. First, the rigid Quick-Up frame, which is much less wobbly underfoot than a pure drop-stitch wall and feels closer to a fixed spa. Second, the built-in UVC water steriliser, which uses ultraviolet light to keep the water clear and genuinely reduces how much chlorine you get through. Add the largest 930 L volume here and a clear app, and the Bergen justifies its higher price for buyers who want the most solid-feeling tub.
More convincingly than most tubs that claim it. At 204 cm across and 930 L it is the largest tub on test, so six adults can sit without elbows clashing, and four have genuine room to spread out. As always, the more people and the bigger the volume, the more water there is to heat, so a full six-person tub costs more to run than a four-seater. If you rarely fill it, a smaller tub will be cheaper day to day.
Water is pumped past an ultraviolet-C lamp inside the unit, and the UV light deactivates bacteria and algae as the water circulates. It does not replace chlorine entirely, but in our use it noticeably cut how often we needed to dose the water and kept it clearer between changes. It is a sensible feature if you dislike the smell of heavily chlorinated water or want to use fewer chemicals overall.
The MSpa Comfort Bergen is our premium inflatable hot tub because it feels a class above the basic round tubs: the rigid Quick-Up frame is the most solid structure on test, the built-in UVC steriliser genuinely cuts your chemical use, and at 930 L it is the most spacious tub here, with strong heat retention of about 1.7°C an hour despite its size. It is held back by being the most expensive tub to buy at around £600 and the most expensive to run at roughly £48 a month, both simply because it holds the most water, so it makes sense only if you regularly fill those six seats. If you want a smaller, cheaper tub for two, the Bestway Lay-Z-Spa Bali is the cosy choice; if you want the best heat retention for the money, the Lay-Z-Spa Paris is our overall pick. See our best 6 person tub guide and our buying guide for the full picture.