Heating and filtration
Hot tub running cost calculator
Model the electricity used to maintain temperature. Weather, insulation, water temperature and use all make a substantial difference.
Your hot tub
Estimate daily operation
Use average active power and equivalent full-power hours per day. A smart meter can help you derive a better average.
This is an energy estimate, not a quote. Chemicals, water and servicing are not included.
Heat loss matters
Outdoor conditions change everything.
The heater does not normally draw full power continuously. It cycles to replace heat lost through the cover, cabinet and ground, while pumps and filtration add further consumption.
| Illustrative use | Daily energy | Cost at 24.5p |
|---|---|---|
| 2 kW × 4 h | 8 kWh | £1.96 |
| 2 kW × 6 h | 12 kWh | £2.94 |
| 2.5 kW × 8 h | 20 kWh | £4.90 |
A close-fitting insulated cover, sheltered location and sensible set temperature can reduce heat loss. Follow the manufacturer's filtration and water-care schedule rather than switching essential systems off.
Common questions
Hot-tub answers.
How much does a hot tub cost to run?
Costs vary widely. An average 8 kWh per day costs £1.96 at 24.5p per kWh, or roughly £60 in an average month.
Is it cheaper to leave a hot tub on?
That depends on insulation, frequency of use and outside temperature. Follow manufacturer guidance and compare actual smart-meter consumption over representative weeks.
What costs are excluded?
The calculator covers electricity only. Water, chemicals, filters, servicing and repairs are separate.