Question 1

How much does a hot tub cost to run per month in the UK?

Accepted Answer

At the Ofgem price cap unit rate of 26.11p per kWh (1 July to 30 September 2026), a typical four to six person tub with a good cover works out at roughly £16 to £27 a month holding temperature in summer and roughly £47 to £78 a month in winter. Your own bill depends on tub size, set temperature, cover condition, air temperature and your tariff, so treat these as worked examples rather than promises.

Question 2

Is it cheaper to leave a hot tub on all the time?

Accepted Answer

Usually yes. Modern tubs are designed to stay on, and the thermostat only tops up the heat that escapes. Reheating 1,200 litres from cold takes about 39 kWh, around £10 at the current cap rate, which typically outweighs what you save by switching off between weekly soaks. Only very infrequent summer use makes turning down or off worthwhile.

Question 3

What uses the most electricity in a hot tub?

Accepted Answer

The heater, by a long way. Almost all of the running cost is replacing heat lost through the cover and shell, which is why cover condition and set temperature move the bill far more than jets or circulation pumps. A 2 kW jet pump only costs about 26p per half hour because it runs only while you use it.

Question 4

How can I cut my hot tub running costs?

Accepted Answer

Replace a heavy waterlogged cover, add a floating thermal blanket under the main cover, drop the set temperature by one degree, run long filtration cycles in off-peak hours if you are on a time-of-use tariff, and keep the water chemistry balanced so you are not paying to heat water you then have to drain early.

Question 5

Do chemicals add much to hot tub running costs?

Accepted Answer

Chemicals are a much smaller cost than electricity for most owners, typically a few pounds a month for sanitiser, shock and balancers. Accurate dosing keeps that cost down: overdosing wastes chemical and can force an early drain and reheat, which costs far more in electricity than the chemical saved.

How Much Does a Hot Tub Cost to Run in the UK?