Inflatable hot tub running costs

Updated: October 2026

The heater is 2,000 W, so it is tempting to multiply by 24 hours and call that about £12 a day. That sum is wrong.

The heater is 2,000 W, so it is tempting to multiply by 24 hours and call that about £12 a day. That sum is wrong. Inflatable hot tub running costs depend on how long the heater actually fires, how well the cover holds heat, the tariff on your bill, and the season. Shelf prices sit on the inflatable hot tub comparison. Products Compared did not meter a tub. Figures below are quoted from the brand that published them, or marked as a rule of thumb. A qualifying purchase can earn a commission at no extra cost to you.

Our top picks

Badge	Product	Mains stated	Shut-off or freeze	Cover	Note	Price	Offer
Best overall	Lay-Z-Spa Lay-Z-Spa Aruba AirJet	Not stated (attribute says battery; bullets describe a heater)	Freeze Shield claimed	Yes	8.6	about £394.74	View offer
Alternative	EASE.ZONE EASE.ZONE 4–6 person spa	220–240 V	Not stated	Yes	6.1	about £667.92	View offer
Preis-Tipp	MSpa MSpa Tekapo 6P	230 V AC	Not stated	Not stated	6.4	about £399	View offer

Best overall

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

8.6/10about £394.74

View offer

Alternative

EASE.ZONE EASE.ZONE 4–6 person spa

6.1/10about £667.92

View offer

Preis-Tipp

MSpa MSpa Tekapo 6P

6.4/10about £399

View offer

On this page

1.Why wattage times 24 is wrong
2.What Lay-Z-Spa publishes
3.What you cannot say about the other listings
4.Cover, season, and Freeze Shield

Why wattage times 24 is wrong

A heater rated at 2,000 W uses about 2 kWh in an hour only while it is heating. Lay-Z-Spa's FAQ states that heater load, a massage function around 800 W, and a filter around 50 W. The filter can run for long stretches. The heater is a thermostat: hard from cold, then cycling to replace heat the cover failed to keep. The first week looks frightening because you are raising a few hundred litres from tap temperature, not topping up water already at 38°C. Lay-Z-Spa's advanced-heating page 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 when it is cold. Those hours are theirs. Put the cover on before that climb. The steps are on how to set up an inflatable hot tub.

What Lay-Z-Spa publishes

Lay-Z-Spa's running-cost page puts a regular inflatable at about £9–£12 a week, or about £6–£8 with a thermal cover and a floor mat. EnergySense is about £5–£7 and ThermaCore about £4.50–£6. The method is a Miami AirJet of 669 litres, a tariff of 24.67 p/kWh, water held around 38–40°C, about 1.5 hours of jets, in spring or autumn. Quote the band with those conditions. The Aruba is not the Miami. It is a different model at £394.74, so the Miami week is not a metered bill for B095PK7W5D. A separate energy page cites an SGS comparison: 20°C to 39°C in 8.5 hours, 17.25 kWh, and a cool-down of 0.28°C per hour from 39°C to 30°C. At 24.67 p, 17.25 kWh is about £4.25 for that climb. A retailer calculator has cited an Ofgem cap of 26.11 p/kWh. That figure is not your tariff.

Testsieger

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

8.6/10about £394.74

View offer

What you cannot say about the other listings

You cannot move those weekly bands onto the MSpa Tekapo or any generic. They have not published a kWh test we can cite. The Tekapo's 40% energy-saving motor, the SENODON up to 50% line and the generic up to 80% line are seller sentences, not measurements. Buying the £745.99 tub to save energy would be buying silence. The best inflatable hot tub page is there so the electricity question does not talk you into an unreviewed listing. The EASE.ZONE bullets claim a 1,200 W heater and 0.5–1°C per hour, slower than Lay-Z-Spa's 1.5–2°C claim, on a different volume. We do not have the test that would turn that into kilowatt-hours.

Cover, season, and Freeze Shield

Winter costs more because the air is colder, the first heat takes longer, and the heater cycles more often. Lay-Z-Spa's heating page allows 24–48 hours or longer from cold in cold weather. A tub you let fall back to tap temperature every week pays the heat-up again. Freeze Shield is not a 40°C soak. When the temperature is below 6°C and the pump is powered, the brand describes circulation and heat towards about 10°C. The pump has to stay plugged in. A thermal cover does not replace it, and generics here do not document Freeze Shield. Packing the tub away is the other winter choice, on storing an inflatable hot tub for winter.

Common questions

How much does an inflatable hot tub cost to run in the UK?

Lay-Z-Spa publishes about £9–£12 a week for a regular inflatable, or about £6–£8 with a thermal cover and floor mat, on a Miami AirJet example at 24.67 p/kWh in spring or autumn. That is not a universal bill, not the Aruba's metered cost, and not a figure for other brands in this set. Use your own unit rate.

Does the heater stay on all day?

No. A 2,000 W heater draws about 2 kWh only while it is heating. A thermostat cycles it. The filter, where Lay-Z-Spa states about 50 W, is the smaller load that can run for many hours. Multiplying 2 kW by 24 hours invents a bill the tub does not use.

How much is the first heat from cold?

Lay-Z-Spa cites an SGS heat-up of 17.25 kWh to go from 20°C to 39°C in 8.5 hours. At their 24.67 p example that is about £4.25 for the climb, and your tariff will differ. Their heating page also allows 6–12 hours for 660 litres in an English summer, and much longer in the cold. The EASE.ZONE claim of 0.5–1°C per hour is a different product.

Does a thermal cover change the bill?

On Lay-Z-Spa's Miami example, adding a thermal cover and a floor mat is the difference between about £9–£12 and about £6–£8 a week. That is their method, not a guarantee for a generic tub whose 50% or 80% line has no test behind it.

Is Freeze Shield the same as keeping it at 40°C?

No. Freeze Shield, when the pump is powered and conditions are below 6°C, is described as heating towards about 10°C. Holding a soak at 38–40°C is a larger, ongoing heater job. A cover helps that soak. It does not switch Freeze Shield on if the pump is unplugged.

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