Children hot tub safety: ages, heat and the cover

The cover is on the patio chair because you stepped inside for towels, and a four-year-old is already at the rim. Children hot tub safety starts with that minute, and with three UK sources that print three different cuts. RLSS UK, the BISHTA owners' handbook, and a Devon and Somerset Trading Standards note for accommodation providers are the pages in front of you. You keep the cuts separate, you set the heat for the youngest person allowed in, and you put a solid cover back on the moment the soak ends. A garden spa you might buy sits on the inflatable hot tub comparison, and that table is a soak.

In short

RLSS UK says under-fives should stay out, and that a solid lockable cover goes straight back on. BISHTA's handbook excludes under-fours, prefers about 36°C for under-12s, and says never above 40°C. The Devon and Somerset note recommends against under-eights for accommodation providers, so a holiday let and a private garden are different duties.

What the UK bodies actually say

Three published cuts are in circulation, and they answer different questions. RLSS UK's splash-safely advice says under-fives should not use a hot tub. BISHTA's hot tub owners' handbook draws its hot tub age limit at under four. Devon and Somerset Trading Standards, writing for accommodation providers, say children under eight are not recommended. A child who has turned four is still under five, so the RLSS line keeps that child out of the water. The same birthday has passed BISHTA's under-four cut. The accommodation note still groups that child with the under-eights. Averaging them into one age throws the sources away.

A household that wants one garden rule inside both home sources keeps under-fives out. That choice is stricter than the BISHTA handbook on its own, and it is your rule for your patio. Name the source when you explain it to another parent, because "fine from four" and "fine from five" come from different pages.

A holiday let sits with the business note. The under-eight recommendation was written for people who provide accommodation, beside a temperature line that guests should stay at or below body temperature. Your own children on a Saturday are the RLSS and BISHTA pair. Guests in a cottage you let are the audience in our hot tub holiday let guide. Say which page you are following before a parent treats a handbook cut as permission you never gave.

Temperature, not just age

Age gets the argument. Hot tub temperature for children is what the handbook actually numbers. BISHTA says never above 40°C, and it prefers about 36°C for children under 12. Forty is a ceiling. A panel left at 40 because that is the top of the dial has used the adult maximum as a child setting. The Devon and Somerset note for accommodation providers says children should stay at or below body temperature. That sentence belongs to lets.

The Lay-Z-Spa Aruba AirJet, our top pick on the inflatable comparison, lists a maximum of 40°C on amazon.co.uk, at £394.74 with 4.4 from 30 ratings. That maximum is the listing's top figure for the heater. It is a poor set point for an under-12 who has cleared the age line you follow. Move toward the BISHTA figure of about 36°C, then check the water. A display and a floating thermometer can disagree after a lid has been on in the sun. Believe the reading in the water.

These three sources set age and temperature. They leave you without a minute chart to borrow. A short soak at about 36°C is the shape of the handbook advice for under-12s. If the only comfortable setting for the adults is the ceiling, the child waits with the cover closed.

The cover after every use

RLSS UK, in the 2024 update of its splash-safely advice, states that three children drowned in uncovered hot tubs in 2022-2023. That figure is their wording for those years. The same advice asks for a solid lockable cover, put back immediately, and it asks that under-fives stay out. Two minutes indoors for towels is long enough for a child to reach the rim.

Hot tub cover child safety on an inflatable is a harder job than the phrase "cover included" suggests. A light lid on a soft shell can be lifted, knelt on, or left half clipped. RLSS asks for a solid lockable cover. A parts list that says a cover is in the box has not promised a lock. The Aruba listing includes a pool cover, a type VI filter cartridge, and a ChemConnect dispenser. It does not describe a lock. If a child can raise that lid, the water is open.

Put the cover on before you go inside, before you answer the door, and before you wander off to talk. Clips count once they are fastened. A lockable hot tub cover still needs the lock used. Where the lid cannot be locked and younger children use the garden, an adult stays whenever the lid is off, and the closed lid has to be one a small child cannot shift.

Supervision when the cover is on

Several adults in the garden feel like supervision. They are often a conversation. Before anyone changes, agree which one person will supervise children at the hot tub for this hour. That person is in the water with a child who is old enough to be there, or they are at the rim with nothing else in their hands. The other adults can cook.

Under-fives stay out even when that watcher is excellent. RLSS draws the line at use. Older children who clear the line you have chosen still get a watcher, a cooler set point, and a session that ends with the cover on. A cover is a barrier, and it is also a surface children climb. The closed position is for keeping people out, with the fastenings done.

Bubbles have no separate ban in these three sources. The Aruba file claims 110 AirJets for a two-to-three adult soak. Jets are a soak feature. They do not make the tub a play pool, and they do not move a four-year-old across the RLSS line. If you want splashing, length, and swimming, you are shopping for a pool. Keep the jets for people who have cleared the age and temperature rules, with one adult whose job is the water.

When a pool is the product they meant

Children who want to swim are asking for a different product. A hot tub holds hot water for a short soak. A rectangular pool holds cooler water for play, and it needs a way in and out that you have planned. Start with the rectangular above-ground pool comparison and a pool ladder when the afternoon is swimming. The inflatable spa comparison stays relevant when the adults want heat and the children are following the age line, or staying out of the water entirely.

A pool does not cancel the drowning risk the RLSS note describes for open water. An uncovered pool is the same class of problem as an uncovered tub, because a child can reach it while you are inside. The ladder comes off, or the access shuts, when swimming is over, in the same spirit as the cover going straight back on a spa.

The Aruba is listed for up to three adults, with air jets and a cover in the box, at £394.74. Choose it when two or three adults want a bubbling soak, you will run nearer 36°C if an under-12 who clears your age rule joins them, and the cover goes on before the group breaks up. We compared the amazon.co.uk listing with the published UK age and temperature lines, and we did not run a lab soak. A qualifying purchase through our links can earn us a commission at no extra cost to you.