Hot tubs are becoming increasingly popular in UK gardens, but one of the first questions most homeowners ask is: how much does a hot tub cost to run each month? The answer depends on several factors, including insulation quality, usage, electricity prices, and the time of year. However, you can estimate realistic running costs with a few practical guidelines.

Average Hot Tub Electricity Use in the UK

Most standard hot tubs use between 3 and 6 kWh of electricity per day under normal use. With UK electricity prices typically ranging between 25p and 35p per kWh (depending on tariff and region), this works out at approximately:

• £25 to £60 per month in electricity for an efficiently insulated hot tub
• £60 to £90 per month for larger or less efficient models

These figures assume regular use (3–4 times per week) and that the tub remains heated continuously, which is the most energy-efficient way to operate it.

Real Running Cost Example

Let’s take a typical example:

• 4–5 person hot tub
• Daily electricity use: 4 kWh
• Electricity price: 30p per kWh

Calculation:
4 kWh × £0.30 = £1.20 per day
£1.20 × 30 days = £36 per month

In winter, running costs can increase by 20–40% because the heater works harder to maintain temperature, especially in colder parts of the UK.

Factors That Affect Running Costs

Several factors have a big impact on how much electricity your hot tub uses.

1. Insulation Quality
Well-insulated hot tubs retain heat far better. Premium models often have full-foam insulation or thermal layers that significantly reduce heating time and energy use.

2. Outdoor Temperature
Hot tubs placed in exposed or windy areas lose heat faster. Positioning your tub in a sheltered corner or near fencing can reduce heat loss.

3. Usage Habits
Keeping the lid on when not in use is essential. A good thermal cover can cut heat loss by more than half.

4. Water Temperature
Running your hot tub at 38–40°C all the time will cost more than maintaining it at 36–37°C and raising it slightly before use.

5. Electricity Tariffs
Some households reduce costs by using off-peak electricity tariffs or smart meters, especially if heating cycles can run overnight.

Winter vs Summer Running Costs

In summer, many UK hot tub owners report electricity costs as low as £20–£35 per month, because ambient temperatures help maintain heat.

In winter, the same hot tub might cost £50–£80 per month, particularly during cold spells when night temperatures drop close to freezing.

Tips to Reduce Hot Tub Electricity Costs

If you want to keep running costs down, consider these simple steps:

• Use a high-quality, well-fitting thermal cover
• Check and maintain water chemistry to keep pumps efficient
• Lower the temperature slightly when not in regular use
• Clean filters regularly to reduce strain on the pump
• Install windbreaks or fencing to reduce heat loss

Is a Hot Tub Expensive to Run?

For most UK households, hot tub electricity costs are comparable to running a second fridge or small electric heater. While costs do increase in winter, good insulation and sensible usage habits can keep monthly electricity bills manageable.

If you’re planning to buy a hot tub, it’s worth comparing models not just on purchase price, but on insulation quality and energy efficiency, as these factors often save hundreds of pounds over the lifetime of the tub.