How Much Does a Hot Tub Really Cost Per Year? Electricity, Heating, Supplies, Maintenance, and How to Lower the Bill

You’re thinking about getting a spa, but you don’t want any surprises on the bill. People often worry about electricity costs, but the annual cost also depends on water, supplies, filters, and a few common usage mistakes. At Atelier Nordic, we see the same thing time and again: a good hot tub can cost less than you might think… as long as the installation and settings are done right.

Heating and filtration are the two main drivers of electricity consumption. Heating compensates for heat loss (tank, piping, water surface, wind). Filtration, on the other hand, runs every day, even when you’re not swimming.

To calculate costs, you need to start with a realistic price per kWh. In Switzerland (basic service), ElCom has published a median overall rate of 27.7 ct./kWh for 2026. According to the same source, a separate metering fee is also listed at 74.40 CHF/year for a typical household (H4 profile). These figures do not specify a spa’s energy consumption, but they allow you to convert your kWh into Swiss francs using a solid institutional basis.

Two hot tubs at the same temperature can have very different operating costs. The difference comes down to the insulation of the tub, the insulation of the deck, the treatment of thermal bridges, and the quality of the cover. A spa installed outdoors and exposed to the wind will lose heat more quickly. A spa placed near a wall, under a shelter, and properly covered requires less frequent reheating.

What if you turned that logic on its head? On our outdoor spas, we always emphasize a simple principle: minimize heat loss before increasing power. You pay for the energy you let escape.

That’s why we partner with Viskan Spa, a brand developed for use in Scandinavian countries where outdoor temperatures often drop to -20°C. Insulation is therefore the key strength of Viskan hot tubs, which, as a result, consume less energy than other brands.

Filtration is often set at random: either too long or unevenly distributed throughout the day. However, this cycle should be based on your usage, the number of visitors, and your ability to maintain stable water conditions. Filtering more does not automatically mean filtering better. Well-balanced water, a clean filter, and a closed cover reduce the need for over-filtration.

Another point: filtration can sometimes cause indirect heating, depending on the plumbing system and the layout of the utility room. A well-designed system prevents the heating of unnecessary spaces (cold air in the filter housing, poorly insulated pipes, constant circulation).

Chlorine, bromine, active oxygen: none of them are free, and any discrepancies stem mainly from your water’s stability. Poorly balanced water consumes more disinfectant, clogs the filter cartridge faster, and requires adjustments (pH, alkalinity, anti-scale). Ultimately, you end up buying more… for a less comfortable experience.

So, what really makes the difference? We prefer to talk about methods rather than promises. If your hot tub is covered between uses, if the temperature is reasonable, and if the filtration is properly calibrated, you’ll reduce your chemical usage. Conversely, a spa left open, overheated, and used in “party mode” (lots of bathers, cosmetics, and towels) will drive up chemical consumption.

Stable water costs less.

The filter is not just a minor detail. A clogged filter cartridge increases pressure drop, impairs water flow, and forces the system to run longer. The result: higher electricity costs, more disinfectant, and water that becomes cloudy more quickly. Cleaning the filter properly and regularly makes all the difference.

And what about water in all of this? Filling, topping off, periodic draining… Again, there’s no reliable universal figure without knowing your tank volume, frequency of use, and the quality of your tap water. But the principle remains the same: water that’s well-maintained (cover, bathing hygiene, balance) needs to be replaced less often.

Finally, keep in mind the “small parts” that ultimately make a difference: seals, valves, nozzles, lighting, and accessories. A well-designed spa like Viskan that’s properly protected from the elements minimizes the need for these replacements, especially when installed outdoors.

You’re looking for an annual range. Since there isn’t any recent institutional data on typical home spa usage, we prefer to provide you with guidelines broken down by profile—in the form of expense categories—along with a calculation method. This is more reliable than a “magic number” that might not apply to your specific situation.

With two people, the water accumulates organic matter more slowly. You can often aim for shorter filtration cyclesand more stable water chemistry. The annual cost then depends mainly on your target temperature, exposure to cold, and the quality of the cover.

To calculate electricity costs, record the kWh used by the spa (via a submeter or by monitoring your electrical panel). Then multiply that by a realistic price per kWh. In Switzerland, ElCom provides a median benchmark of 27.7 ct./kWh for 2026, which is useful for converting your meter readings to CHF.

With children and guests, water quality changes more quickly. Peak usage often requires more frequent filtration and disinfection. The cost of chemicals and filters increases, especially if hygiene rules are lax (no showering, body lotions, or scented laundry detergent on towels).

With a rental, you have to deal with the wear and tear of regular use. Filtration cycles are often longer, inspections more frequent, and maintenance more frequent. The water may require more aggressive treatment, and filters clog more quickly.

What if the spa were part of a larger complex? If you’re managing a property, your planning goes beyond the spa alone. Integrating it into a complete wellness experience (spa, sauna, steam room) requires a cohesive design. Our design firm specializes in creation of professional wellness spaces, to minimize energy loss and simplify daily maintenance.

Want to save money? You’ll find savings in heat loss, proper cover maintenance, and water stability. Here are the factors that have the greatest impact, without resorting to extreme adjustments:

• Choose a high-quality, well-fitting cover, and make sure to close it every time between baths.
• Opt for premium insulation for the tub and surround, especially for an outdoor spa. There’s only one brand: VISKAN…
• Set a realistic target temperature, then stop constantly adjusting the setpoint.
• Adjust the filtration cycles to suit your needs, rather than using the “default” settings.
• Clean the filter cartridge properly to prevent over-filtration and unstable water quality.
• Place the spa in a sheltered spot, near a wall or under a cover, without blocking the ventilation openings.
• Add a windbreak if the location is exposed, especially at high altitudes or in open areas.
• Protect the hot tub in the winter (with a cover, shield, and easy access to the cover), rather than leaving it exposed to the elements.
• Optimize the fill process: use pre-filtered water if necessary, and ensure proper balance from the start to avoid costly adjustments.
• Adopt a simple hygiene routine: a quick shower, no cosmetics, and no fabrics treated with scented laundry detergent.

One thing many people forget: the type of hot tub matters, too. A model designed to stay outdoors, with a sturdy thermal shell, isn’t meant to be used the same way as a lightweight hot tub. Our rigid hot tubs are specifically designed with this focus on durability and energy efficiency in mind, when the goal is to keep operating costs under control.

Are you trying to decide between an indoor and an outdoor spa? An indoor spa reduces exposure to wind and cold, but requires strict management of humidity and ventilation. An outdoor spa simplifies the setup, but requires a strategy to prevent heat loss. The right choice depends on your building, not on a general rule.

Want to estimate your annual cost accurately? Tell us your setup (location, target temperature, frequency of use, and any restrictions on access to the system), and we’ll help you come up with a realistic estimate based on your actual kWh usage and habits—not on some vague average.