Electricity consumption
How much does a North Wave hot tub use?
The full calculation, model by model, with its assumptions shown. Change your region, your tariff and your habits: the result follows.
Sølveijg 5-seat hot tub
382 € per year
that is €32 per month, for 1,897 kWh used. Water at 35 °C, air at an average of 9 °C, covered hot tub.
Maintaining temperature
1,1 W/°C/m² × 5,3 m² × 26 °C difference × 8,760 h
1,325 kWh
€26770 %
Circulation and filtration
49 W × 8,760 h (low-energy pump, continuous)
429 kWh
€8723 %
Massage
4 kW × 20 min × 1 bath per week
69 kWh
€144 %
Two reheats
1,370 L from 12 °C to 35 °C, twice a year
73 kWh
€154 %
What the calculation assumes
- Air at an annual average of 9 °C (Mountain (Alps, Jura, Massif Central), Météo-France normals 1991-2020).
- Water maintained at 35 °C all year round.
- Electricity at €0,2016 incl. VAT per kWh.
- Hot tub covered between uses, cover in good condition.
- A hot tub left idle in winter, drained, uses nothing but deteriorates: the calculation assumes use all year round.
The heat loss used is 1.1 W per degree of difference and per square metre of water surface, which is that of a well-insulated shell under a cover in good condition. North Wave hot tubs get triple Scandinavian insulation, rated R18 by the brand, and a 12 cm cover: we do not credit them with more than that, for lack of a measurement that says how much more. We prefer to publish these figures and have them challenged, rather than announce an amount without the reasoning behind it. See the insulation in detail.
Hot tubs, from least to most energy-hungry
Under the conditions chosen. The difference comes down to the water surface, not the number of jets.
- ModelPer yearPer month
- Stølen2 seats, 1,330 kWh€268€22
- Tønsberg3 seats, 1,391 kWh€280€23
- Rødberg3 seats, 1,459 kWh€294€25
- Sørrana5 seats, 1,549 kWh€312€26
- Bjørgan4 seats, 1,669 kWh€336€28
- Øppland5 seats, 1,669 kWh€336€28
- Drøbak4 seats, 1,688 kWh€340€28
- Tørrvika4 seats, 1,895 kWh€382€32
- Sølveijg5 seats, 1,897 kWh€382€32
- Søvik6 seats, 1,895 kWh€382€32
- Røgaland4 seats, 1,986 kWh€400€33
- Hølen5 seats, 2,032 kWh€410€34
Swim spas
Under the conditions chosen. The difference comes down to the water surface, not the number of jets.
- ModelPer yearPer month
- Bødø 3806 seats and up, 3,616 kWh€729€61
- Førde 4106 seats and up, 3,853 kWh€777€65
- Hørten 4506 seats and up, 4,102 kWh€827€69
- Øxførd 4806 seats and up, 4,272 kWh€861€72
- Nørdland 5506 seats and up, 4,707 kWh€949€79
- Vardø 5806 seats and up, 4,886 kWh€985€82
- Risør 6006 seats and up, 5,038 kWh€1,016€85
- Øslø 6006 seats and up, 5,044 kWh€1,017€85
- Sløvika 6006 seats and up, 5,054 kWh€1,019€85
Frequently asked questions
- How much does a North Wave hot tub use per year?
- Under the conditions selected above, from €268 to €410 per year for hot tubs, or €22 to €34 per month, and €729 to €1,019 for swim spas. The difference comes from the water surface to keep warm, and very little from the number of jets.
- What costs the most in a hot tub?
- Keeping the water at temperature, by a long way. Massage barely registers, because it only runs during bathing. That is why insulation matters more than equipment: a well-equipped, well-insulated hot tub uses less energy than a bare, poorly insulated one.
- Does the cover really make a difference?
- Yes, it is the biggest saving. Most of the heat is lost through the water's surface. A sagging, waterlogged or badly fitted cover roughly doubles surface losses, which the calculation reproduces when you choose 'Absent or worn'.
- Should you lower the temperature in winter or switch the hot tub off?
- Lowering the setpoint by 2 °C cuts the bill by about 8%, as the calculation shows. Switching it off completely is a false economy: you must drain it to prevent freezing, and reheating a full pool costs a good part of a month's running.
Your bill, for your installation
A calculation is still a calculation: your shelter, your exposure to wind and your habits matter too. At the Richwiller showroom, we go through the figures with you, electricity contract in hand.