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How to set up an inflatable hot tub

Updated: October 2026

The box is on the patio, the hose is in the kitchen, and nobody should get in until the base, the socket, and the water are sorted. This is how to set up an inflatable hot tub on a first weekend in the UK, using the checks that apply before a soak, not a ranking of the eight listings. The product table is the [inflatable hot tub comparison](/hub/swimming-pools/inflatable-hot-tub). Products Compared did not install a tub. The steps below follow maker guidance where a brand has published it, and they stop where an electrician has to start. A qualifying purchase can earn a commission at no extra cost to you.

The box is on the patio, the hose is in the kitchen, and nobody should get in until the base, the socket, and the water are sorted.

Our top picks

Lay-Z-Spa Lay-Z-Spa Aruba AirJet

Best overall

Lay-Z-Spa Lay-Z-Spa Aruba AirJet
8.6/10about £394.74
View offer
EASE.ZONE EASE.ZONE 4–6 person spa

Alternative

EASE.ZONE EASE.ZONE 4–6 person spa
6.1/10about £667.92
View offer
MSpa MSpa Tekapo 6P

Preis-Tipp

MSpa MSpa Tekapo 6P
6.4/10about £399
View offer
On this page
  1. 1.Ground, clearance, and the hose
  2. 2.The socket, in one decision
  3. 3.Water before the first soak
  4. 4.Cover on, then wait for heat

Ground, clearance, and the hose

Put the tub on ground that is flat, firm, and free of stones. A hollow becomes a lean once the water is in, and a lean creases the wall. A swept patio slab is a better start than a lawn you hope will settle. A ground cloth goes down before the liner. Leave a path to the filter and the RCD test button. Lay-Z-Spa's notes talk about a drain nearby. Treated water should go to a foul drain, not the grass: their pack-away guidance says it can kill plants. Plan that hose run while the tub is empty. Seat counts and missing covers are on the inflatable hot tub buying guide. If the listing never included a cover, do not start the heater until you have one.

The socket, in one decision

Lay-Z-Spa's UK FAQ states a 13 A supply at 240 V, a cable of about 7 m, and a built-in PRCD on the pump. The socket should be at least 4 m from the tub and about 1.2 m high. Do not use an extension lead, and do not share the socket with another heavy appliance. The In: 16 A mark on a PRCD is the device rating. The plug fuse is still 13 A. Do not swap in a larger fuse to stop a trip. If the cable stops short of an RCD-protected outdoor socket, stop and call a competent electrician. Do not add a reel or a lead under the cover. If the RCD trips when the heater starts and a reset does not hold, stop again. A bathroom install is the same stop. The Aruba attribute says battery. The bullets and the brand FAQ describe mains heat, so set it up as a mains appliance. What the socket has to provide is on outdoor socket for a hot tub.
Lay-Z-Spa Lay-Z-Spa Aruba AirJet

Testsieger

Lay-Z-Spa Lay-Z-Spa Aruba AirJet
8.6/10about £394.74
View offer

Water before the first soak

Once the tub is full to the line, circulate before anyone sits down. Clearwater's guide describes a shock, then free chlorine around 3–5 ppm, and it says not to bathe above 5 ppm. If the strip is high, wait and dilute. BISHTA's handbook says not to exceed 40°C. Check with a thermometer if you do not trust the pump display. Children are a separate decision: RLSS UK advises that under-fives do not use a tub, and BISHTA advises against under-fours, with a lower temperature for older children.

Cover on, then wait for heat

The cover goes on as soon as the water is dosed and the pump is running. It is insulation, and it stops a child or a pet finding open hot water. RLSS UK tells owners to put a solid cover straight back on. An inflatable is still deep enough to drown in if the cover is off and nobody is watching. Heat from cold is not the same on every brand. Lay-Z-Spa says about 1.5–2°C per hour, and 6–12 hours for a 660 litre tub in an English summer, or 24–48 hours or longer in the cold. The EASE.ZONE bullets claim 0.5–1°C per hour from a 1,200 W heater. Do not blend those rates. The kilowatt-hours stay on the running costs page.

Common questions

What do I put the tub on?
Flat, swept, solid ground, with a ground cloth if the manual or the box includes one. Stones and a sloping lawn are how the wall creases. Check the tub is not tilting once the water is in, and leave access to the pump and the drain route.
Can I use an extension lead?
Not on a Lay-Z-Spa. The UK FAQ forbids an extension lead and a shared socket. Their fault page links trips to leads and to kettles or freezers on the same socket. If the cable is short, an electrician fits a socket. A reel under the cover is not a workaround.
How far should the socket be?
Lay-Z-Spa asks for the socket at least 4 m from the tub and about 1.2 m high, with a cable of about 7 m. That is their instruction for their pump. Another brand's manual wins if it states a different distance. The HSE point that stays is a 30 mA RCD you test before use.
When do I add chlorine?
After the tub is filled to the line and circulating, and before anyone gets in. Aim for the band your chemical guide prints, commonly about 3–5 ppm free chlorine, and do not bathe above 5 ppm. A 20 g per 1,000 litres line is Lay-Z-Spa's example, not a dose for every listing.
How long will the first heat take?
It depends on the brand, the volume, and the weather. Lay-Z-Spa quotes about 1.5–2°C per hour and 6–12 hours for a 660 litre tub in an English summer, longer in the cold. EASE.ZONE claims 0.5–1°C per hour. Use the figure for your pump, with the cover on, and read the running-cost page before you treat that first day as a normal bill.
When should an electrician do the socket?
When there is no outdoor 13 A socket on a 30 mA RCD within the pump cable, when the RCD keeps tripping, or when the tub would sit in a bathroom. Do not add a spur yourself from a blog. The product manual does not make you a designer under BS 7671.

Related pages

Children and hot tubs

Inflatable hot tub

AirJet or HydroJet hot tub: bubbles or water massage

Best inflatable hot tub UK for two or three adults

Inflatable hot tub buying guide: seats, jets, cover

Inflatable hot tub running costs: what a week uses

Sources

Public UK sources for electrical safety, temperature, planning and the Lay-Z-Spa mains and cost figures. Listings are the amazon.co.uk captures for these eight ASINs, not a live reload on 17 October 2026. Prices on amazon.co.uk move.

  1. GOV.UK product recall: Go Plus inflatable spa, 20 August 2021 (retrieved 17 October 2026)
  2. HSE: electrically powered equipment (retrieved 17 October 2026)
  3. IET Wiring Matters: hot tubs, July 2021 (retrieved 17 October 2026)
  4. Planning Portal: hot tub in a garden (retrieved 17 October 2026)
  5. BISHTA hot tub owner's handbook (retrieved 17 October 2026)
  6. RLSS UK: splash safely around hot tubs (retrieved 17 October 2026)
  7. Lay-Z-Spa UK FAQ (retrieved 17 October 2026)
  8. Lay-Z-Spa running costs (retrieved 17 October 2026)
  9. Clearwater: hot tub chemicals guide (retrieved 17 October 2026)