(January 2022 update)
The information regarding running costs is now outdated due to the increase in energy costs. We cannot currently provide general estimates on running costs. We hope the situation will ease soon. This post remains for historical reference. Please also consider looking into our webpage about air source heat pumps for hot tubs, a far more cost-effective way to heat your hot tub: https://www.ukhottubs.co.uk/air-source-heat-pumps.
There are a number of factors that will affect the likely running costs of hot tubs and swim spas, including heat loss and usage:
Firstly, the water volume that needs heating will have an impact. The greater the volume that needs heating, the higher the running costs. Some hot tubs may hold around 1,000 litres, while swim spas can often hold more than 10,000 litres.
Water temperature is typically set between 36°C to 40°C, but in the summer, especially during very hot weather, this might be reduced to make the temperature more comfortable. The higher the water temperature, the more energy is required to maintain it, and therefore the higher the running costs.
The ambient temperature also plays a role when the cover is off. The greater the difference between the water temperature and the ambient air temperature, the more rapidly heat is lost. Heating a hot tub in the winter generally incurs greater costs, though it’s a fun experience to enjoy a hot tub on a cold day with clear blue skies!
The frequency of usage also matters. Obviously, the more the hot tub is used—when the cover is off and pumps or blowers are running—the more it will cost to run. Agitated, aerated water surfaces lose heat faster than still water.
Is your hot tub installed indoors or outdoors? This too will affect running costs. Indoor hot tubs, due to a more stable ambient temperature year-round, generally incur lower running costs. However, an indoor hot tub will need additional equipment to control humidity and air temperature.
When not in use, always ensure the cover is properly replaced on the hot tub to prevent heat loss. Ensure that it fits snugly without gaps. If your cover becomes heavy with water, replace it to maintain its heat retention properties.
So, what are my likely running costs?
Electricity costs vary widely, depending on your provider. The tariff you’re on will have an impact, so it’s always a good idea to keep checking comparison sites to ensure you’re getting the best utility deal. According to BISHTA members, typical running costs range from £1.00 to £2.00 per day for a quality hot tub from a reputable manufacturer, based on half an hour of daily use.
Some hot tubs are more energy-efficient than others, and cheaper models may lack proper insulation, increasing running costs. Always ask your retailer about energy efficiency and request any available data.
Finally, you’ll need to account for the cost of water treatment chemicals. These are essential for keeping the water clean and hygienic. Fortunately, hot tubs use relatively small amounts of water, so the required chemicals are minimal. An annual budget of around £300 should cover water treatment costs, though heavily used hot tubs or swim spas may require a larger budget.
Data courtesy of BISHTA. For more information, please contact a member of our team at 02392 471 073.
