What does it cost to run a spa?

That all depends…

And to be fair, it does depend on quite a range of things.

There are a huge number of different spas and hot tubs on the market and they all have slightly different specifications and features.

Your spa might be indoor or outside. If it’s outside you might use it all year around or just when the weather is good or somewhere between the two.

And of course spas and hot tubs come in all shapes and sizes.

That all depends on these things.

  • The size of the spa. A bigger spa has a greater water volume and that water has to be heated and pumped around the spa.
  • Fit and quality of the cover. When the spa isn’t in use, a thermal insulation cover will slow the cooling of the water down. It actually takes very little energy to maintain the water temperature, its heating it up that costs the money and a good quality and well-fitted cover can make a big difference.
  • The surface area of the spa. This is where most heat is lost when the hot tub is being used so once again, the bigger the spa the higher the cost. When the spa isn’t being used, make sure that cover is on.
  • The temperature around the spa. Obviously an indoor spa will have a higher ambient air temperature around it and so loose less heat. By the same token an outside spa in the summer is going to use less energy to maintain the water temperature than the same spa in the winter.
  • The size of the heater. Different spas and hot tubs have different heaters, usually rated in Kw. A more powerful heater is going to use more electricity and therefore run at a higher cost but it will heat the spa to full temperature more quickly and so be running for a shorter time.
  • The size and efficiency of the pumps. The water in your spa needs to be circulated. The pump pulls water in from the bottom of the tub and the skimmer, filters it and passes it through the heater before sending it back into the tub via the nozzles and jets. The size of the pump is dictated by the size of the spa and the number and complexity of those jets. Some spas have several pumps doing different jobs.
  • The insulation. Modern spas are usually very well insulated but of course this will vary from model to model and between different manufacturers.
  • How much is the spa used. This makes a huge difference. A spa with it’s cover on, the thermostat set to simply maintain the temperature and the pumps not running uses very little energy indeed.

Other costs are going to include some chemicals to keep the water clean and sparkling but an average family spa only contains about 1000 litres so the cost is minimal in comparison to a swimming pool.

As you can see from the list above an exact figure is just about impossible to calculate. However for an average family spa a typical running cost over the course of a year would be about £1 a day.

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