The short answer
Per month, a well-insulated solid hot tub typically costs around £40–£90 in electricity, while an inflatable or poorly insulated tub can run £85–£150, assuming a UK electricity unit rate of about 27p per kWh. Add roughly £10–£30 a month for chemicals and filters, and a typical all-in monthly figure lands somewhere around £50–£120 depending on the tub and how you use it. Winter sits at the top of the range and summer at the bottom, because the heater works harder against the cold. The honest answer is a range, because it depends on insulation, the temperature you hold and how often you use it.
The monthly figure is mostly electricity, plus a smaller chemical cost. Insulation and the season are the big levers. The figures below assume a unit rate of about 27p per kWh — scale them to your own tariff for a personal estimate.
Typical monthly cost
- Well-insulated solid~£40–£90 electricity
- Inflatable / poorly insulated~£85–£150
- Chemicals & filters~£10–£30
- Typical all-in monthly~£50–£120
- Assumed unit rate~27p per kWh
What the monthly figure includes
- Electricity: by far the largest part — keeping the water hot, which costs more in winter.
- Chemicals: sanitiser and pH balancers, roughly £10–£30 a month with filters factored in.
- Insulation & cover: the biggest variable — a well-insulated tub with a tight cover sits at the low end, a leaky inflatable at the high end.
- Use pattern: the temperature you hold and how often you heat from cold both move the monthly total.
| Type | Electricity / month | All-in / month |
|---|---|---|
| Well-insulated solid | ~£40–£90 | ~£50–£120 |
| Inflatable / poorly insulated | ~£85–£150 | ~£95–£180 |
| Chemicals & filters | — | ~£10–£30 |
Indicative UK figures at an assumed ~27p per kWh unit rate. Sources: WhatSpa and Checkatrade running-cost guides.
How to estimate your own monthly cost
To get a figure closer to your own home, take your electricity unit rate (the figures here assume about 27p per kWh) and scale up or down — a tariff at 22p will land lower, one at 32p higher. Then weigh in your tub's insulation, the temperature you hold and how often you use it. A well-insulated tub with a good cover, run sensibly, sits at the lower end; an inflatable held hot through winter sits at the higher end. Treat the table above as a starting range, not a fixed bill.
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Frequently asked questions
How much does it cost to run a hot tub per month in the UK?
A well-insulated solid tub typically costs around £40–£90 a month in electricity at about 27p per kWh, while an inflatable or poorly insulated tub can run £85–£150. Adding £10–£30 a month for chemicals, a typical all-in monthly figure is around £50–£120 depending on the tub and use.
Why does the monthly cost vary so much?
Because insulation, the temperature you hold, how often you use it and the season all move the figure. A well-insulated tub with a tight cover sits at the low end; a leaky inflatable held hot in winter sits at the high end.
How can I estimate my own monthly cost?
Take your own electricity unit rate (the figures here assume about 27p per kWh) and scale the electricity portion up or down, then factor in your tub's insulation and how often you use it. That gives a more accurate estimate than a single headline number.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on the tub, its insulation and your electricity tariff. They are guidance, not a quotation.