How Much Does It Cost to Run a Hot Tub?

Why wait for your next holiday to enjoy relaxing in a hot tub or swim spa? You can enjoy such a pleasure any time you want in the comfort of your own home. But before committing to such an investment - how much does it cost to run a hot tub?


In this post, we tell you how much. Armed with all more information on hot tub running costs, you will be able to identify energy-efficient hot tubs/spas before making a buying decision.


Are Hot Tubs Expensive to Run?


Hot tubs and all the costs associated with them vary massively, making buying one a little confusing. If you've never experienced owning a hot tub, you might be unsure about running costs.


Of course, the hot tub will make a difference to your monthly energy bill, but it won't increase it significantly. Plus, there are ways you can save money on your electric bill.


Many factors affect hot tub running costs, so let's dive in and get the ball rolling.

How Much Does It Cost to Run a Hot Tub?

Energy usage is the most obvious cost, and we'll look at that later, but what about other ongoing costs?

For example, we recommend your hot tub be serviced at least once a year by a qualified hot tub service engineer.


You must cover the cost of servicing and maintenance as and when needed. Alternatively, you could purchase a service plan from a reputable dealership that includes an annual service of the hot tub. Also, consider add-ons such as drain downs, refilling, and hot tub valeting services.


In addition to servicing and maintenance, you need to buy care products and other consumables to keep your hot tub in tiptop condition.


For example, you'll need to pay for ongoing quality maintenance equipment and replacement parts such as filters and chemical treatments.


What Affects a Hot Tub's Energy Consumption?

Calculating the exact amount of energy a hot tub uses is difficult because of the many variables. A better way to look at the subject of consumption is to think about what affects how much electricity a hot tub uses.

The factors that affect hot tub energy consumption include:

  • The hot tub heater: Most hot tubs/spas use electricity to heat the tub, and they come with different kW ratings. Some heaters are also more efficient than others, and bigger-sized hot tubs/spas have a larger kW rating.

  • Electrical components: Components such as the air blowers and pumps affect how much energy your hot tub uses.

  • How much water the hot tub holds: A large volume hot tub will cost more to run. A typical hot tub contains around 1500 litres, so you will likely use approximately 6,500 litres per year, allowing regular topping up after usage.

  • The hot tub insulation: A hot tub has insulation material inside the cabinet, around the underside of the shell and surrounding the plumbing system. Different insulation materials are more efficient at maintaining a constant temperature. The most efficient heat-retaining system is multiple layers of high density, closed-cell polyurethane full-foam insulation, which is also waterproof.

  • The hot tub cover insulation - value and quality: Hot tubs or spas usually come with a cover or lid. The ideal hot tub cover is a minimum of four inches thick in the middle and two inches at the front and back. It should also fit the hot tub snuggly and create an airtight seal.

  • Usage: The more you use your hot tub, the more energy it requires to maintain the temperature.

  • Stop/start heating: You'll have to pay more for energy if you turn the hot tub on every time you want to use it. On the other hand, energy consumption will be lower if you maintain the water warm. More heating equals higher costs!

  • Refilling: Periodically, you need to refill the tub.

  • Filters and chemicals: If you use good quality filters and chemicals, you won't need to change the water and reheat it so often.

  • Local climate: If you live in a colder part of the UK, more energy is required to maintain optimal hot tub heat levels. If the tub's location is indoors, it will consume less energy than if outdoors.

How Much Electricity Does a Hot Tub Use in the UK Per Day?


Many factors can affect the amount of energy a hot tub uses.

A benchmark figure is around 75p to £1 per day.

This figure is based on current energy tariffs in England of about 12p to 13p per kWh (kilowatt-hour). The average price may vary.


What is the Average Cost to Run a Hot Tub Per Month?


This total cost is based on using the tub three or four times every week.

A good quality hot tub should cost you no more than around £30 to £40 per month in terms of running costs.

More use or greater frequency of use will mean more heating - and more energy consumption!


When you first switch on your hot tub, there will be a massive drain on energy, but when it reaches the desired temperature, your costs will even out.


How Much Does a Hot Tub Cost to Run for a Year?


Calculating the annual running costs of a hot tub is not that easy. Several factors come into play, not just the unit cost of electricity on your electric bill but also servicing and maintenance, water care products and other consumables.


However, we can estimate average hot tub running costs. The following cost breakdown is based on a good quality tub that you might use three or four times each week and enjoy a soak in the tub for between 30 and 45 minutes.

We estimate hot tub running costs to be between £675 and £965 annually.

Running costs can be broken down as follows:

  • Energy costs: £275 - £365

  • Water care and consumables: £350 - £300

  • Service costs: £150 - £300

How Can You Keep Your Hot Tub Energy Costs as Low as Possible?


Pinning down hot tub running costs is not an exact science. But, here are our top tips that will help you keep your hot tub costs to a minimum and improve energy efficiency.

  • Use an off-peak electricity tariff for heating your hot tub.

  • Use a well-insulated cover.

  • Use a thermal blanket.

  • Use a windbreak.

  • Set the temperature.

  • Keep your hot tub clean.

  • When not using your hot tub, close the air jets.

  • Conserve water

  • Decide if it is time for an upgrade.

Let's go into detail about each one.


1. Use off-peak energy for heating your hot tub


Operate your hot tub economically. Energy providers tend to charge less early in the morning and late at night. Install a hot tub thermostat with a timer, and set it so that the hot tub is heating the water during those off-peak hours.


2. Use a well-insulated hot tub cover