How much does a hot tub cost to run?
The cost to run a hot tub depends on several factors, including its size, energy efficiency, frequency of use, local electricity rates, and ambient environmental conditions. Here’s a breakdown of these factors:
1. Size and Model of Hot Tub:
Larger hot tubs have more water volume, requiring more energy to heat.
Modern energy-efficient models typically have better insulation and more efficient components, reducing costs.
Some models have smart settings within the built-in control panel which allows the hot tub to switch off the heater when the hot tub is not in use, and to circulate and filter the water specifically to suit your usage.
2. Frequency and Duration of Use:
Frequent use can increase costs since maintaining the water temperature requires more energy. Conversely, consistent moderate use can be more economical due to the reduced need for reheating.
When in the hot tub water is around 38°C (100–102°F), with the cover removed, and if the ambient air temperature is below 12°C (53°F), the temperature of the hot tub water will reduce while in use, and therfore require energy to reheat.
3. Temperature Settings:
Higher temperatures will increase heating costs. Keeping the hot tub at a slightly lower temperature - for example: 38°C (100°F) instead of 40°C (100°F) can save energy.
Advanced control panels, and customised fitration, circulation and heating setting will also help reduce energy costs. Some hot tub controls can be controlled via a smart phone.
4. Insulation and Covers:
Well-insulated hot tubs and effective covers can dramatically reduce heat loss when not in use. Minimising heat loss translates directly into energy cost savings.
Effective hot tub insualtion can reduce your running costs to around £10 per week through the winter months - this test was carried out for 28 days through temperatures ranging from 10C to 15C (50F-59F) on a hot tub with Triple Insulation (which is a combination of Partial Foam Insulation on the shell, Reflective Insulation on the inside of the cabinet and Thermal Wrap) and with a 5 inch vinyl cover.
Note: weekly hot tub running costs can be as low as £5 per week, when ambient outdoor temperatures are in excess of 23C (77F).
5. Ambient Temperature and Location:
Outdoor hot tubs in colder climates require more energy to maintain temperature compared to indoor hot tubs or those in warmer areas.
Always make sure that you check the type of insualtion inside the hot tub.
Where possible, you should get a written guarantee from the seller of the estimated energy costs.
This way you have a credible point of reference and peace of mind that you, and not your hot tub, have control of your energy bill!
On average, a hot tub could cost anywhere from £20 to £150 per month to run, depending on the temperature at the time of the year, the type and integrity of the hot tub insulation - if any), and assuming regular use and typical electricity rates. Extremely energy-efficient models and very infrequent use may lower costs, while high electricity rates or insufficient insulation could increase cost.
For a more precise estimate, consult the manufacturer’s specifications or use a kilowatt-hour (kWh) meter to measure the actual energy consumption of your specific hot tub. Adding these consumption metrics to your local electric rate will give you a more accurate monthly expenditure.
