The short answer
Running a hot tub in the UK is mostly an electricity cost, plus chemicals and filters. A well-insulated solid (hard-shell) tub typically uses around £40–£90 per month in electricity, assuming a UK unit rate of about 27p per kWh, while a poorly insulated or inflatable model can run £85–£150 per month because it loses heat faster. On top of that, chemicals and filters add roughly £10–£30 per month. Put together, a typical year usually lands somewhere around £760–£1,300. The biggest levers are how well the tub is insulated, the temperature you hold, how often you use it, and the time of year — winter costs more.
Running cost is driven mostly by heat loss and electricity price. 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. The figures below assume an electricity unit rate of about 27p per kWh.
Typical UK running costs
- Well-insulated solid~£40–£90 / month electricity
- Inflatable / poorly insulated~£85–£150 / month
- Chemicals & filters~£10–£30 / month
- Typical year, all in~£760–£1,300
- Assumed unit rate~27p per kWh
What makes up the running cost
- Electricity: the heater keeping the water hot is the main cost, and it rises in winter as the tub works harder against the cold.
- Insulation & cover: a well-insulated cabinet and a good-fitting cover cut heat loss sharply, which is why two tubs can differ a lot in running cost.
- Chemicals & filters: sanitiser, pH balancers and the odd filter replacement add roughly £10–£30 a month.
- How you use it: the temperature you hold and how often you heat from cold both move the figure.
| Item | Typical figure | Notes |
|---|---|---|
| Electricity, well-insulated solid | ~£40–£90 / month | at ~27p per kWh |
| Electricity, inflatable | ~£85–£150 / month | more heat loss |
| Chemicals & filters | ~£10–£30 / month | sanitiser, balancers, filters |
| Typical annual total | ~£760–£1,300 | all in, varies by use |
Indicative UK figures at an assumed ~27p per kWh unit rate. Sources: WhatSpa and Checkatrade running-cost guides.
How to keep the running cost lower
The single biggest factor is heat loss, so a well-insulated tub with a tight, undamaged cover is the foundation. Beyond that, holding a sensible temperature rather than the maximum, keeping the cover on between uses, and maintaining the water properly all help. A better-insulated tub costs more to buy but usually works out lower in cost to run over the years, which is worth weighing against a cheaper, less-insulated model.
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Frequently asked questions
How much does it cost to run a hot tub 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 model can run £85–£150 a month. Chemicals and filters add roughly £10–£30 a month, for a typical year around £760–£1,300 all in.
What makes a hot tub cheaper to run?
Good insulation and a tight-fitting cover make the biggest difference, because most of the cost is heat loss. Holding a sensible temperature, keeping the cover on, and maintaining the water also help. A better-insulated tub usually works out lower in cost over time.
Do running costs change in winter?
Yes. The heater works harder against the cold, so electricity costs sit at the top of the range in winter and the bottom in summer. The annual figure averages those out.
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.