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.
Tørrvika hot tub, 4 seats
436 € per year
that is €36 per month, for 2,164 kWh used. Water at 37 °C, air at an average of 14 °C, covered hot tub.
Maintaining temperature
1,1 W/°C/m² × 5,3 m² × 23 °C difference × 8,760 h
1,172 kWh
€23654 %
Circulation and filtration
49 W × 8,760 h (low-energy pump, continuous)
429 kWh
€8720 %
Massage
4 kW × 20 min × 7 baths per week
485 kWh
€9822 %
Two reheats
1,320 L from 12 °C to 37 °C, twice a year
77 kWh
€154 %
What the calculation assumes
- Air at an annual average of 14 °C (South-West, Météo-France normals 1991-2020).
- Water maintained at 37 °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, 1,657 kWh€334€28
- Tønsberg3 seats, 1,713 kWh€345€29
- Rødberg3 seats, 1,774 kWh€358€30
- Sørrana5 seats, 1,853 kWh€374€31
- Bjørgan4 seats, 1,961 kWh€395€33
- Øppland5 seats, 1,961 kWh€395€33
- Drøbak4 seats, 1,978 kWh€399€33
- Tørrvika4 seats, 2,164 kWh€436€36
- Søvik6 seats, 2,164 kWh€436€36
- Sølveijg5 seats, 2,167 kWh€437€36
- Røgaland4 seats, 2,251 kWh€454€38
- Hølen5 seats, 2,289 kWh€461€38
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, 3,818 kWh€770€64
- Førde 4106 seats and up, 4,040 kWh€815€68
- Hørten 4506 seats and up, 4,264 kWh€860€72
- Øxførd 4806 seats and up, 4,414 kWh€890€74
- Nørdland 5506 seats and up, 4,806 kWh€969€81
- Vardø 5806 seats and up, 4,965 kWh€1,001€83
- Risør 6006 seats and up, 5,108 kWh€1,030€86
- Øslø 6006 seats and up, 5,113 kWh€1,031€86
- Sløvika 6006 seats and up, 5,125 kWh€1,033€86
Frequently asked questions
- How much does a North Wave hot tub use per year?
- Under the conditions selected above, from €334 to €461 per year for hot tubs, or €28 to €38 per month, and €770 to €1,033 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.