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How much a bath costs in energy consumption differs depending on how much and how long you bathe. There is also a large variation in electricity consumption depending on the season.
We have developed our insulation packages with a focus on as low electricity consumption as possible. This means, for example, that it takes over a month (we gave up the measurement after a month and then the water temperature was 14 degrees) for a Pacific (2500 liters) to go from 38 degrees to 10 degrees in the middle of winter. This means that our insulation packages trap the heat in the water effectively.
In our tests with a Pacific spa with a 3 kW heater and full insulation, set to 39 degrees in an outdoor temperature of -10 degrees, the spa had lost one degree after an hour of use. After two hours of use, the spa had lost another half a degree and was down to 37.5 degrees. In this case, a 6 kW heater would have worked better to maintain the temperature while using the spa. Alternatively, if one is willing to accept a slight temperature drop, a 3 kW heater could work well.
During these measurements, the spas were set to Ready mode, which means that the spa constantly maintained the set temperature of 39 degrees. Since most people do not use the spa multiple times a day, it is possible to set the spa to Rest mode and allow it to drop a degree occasionally, thereby reducing energy consumption further.
We have started a measurement where we measure exactly what our hot tubs consume during all months of the year. We started measuring consumption in January 2022, and therefore data will be added as we go along. During the month of January, we performed some temperature increases and decreases and other measurements of the water temperature, so the exact consumption measurement started in March. The measurement was carried out outdoors in Gävle, Sweden.
Grand, approx. 1800 liters
Pacific, approx. 2500 liters
If you keep the hot tub at the same temperature all the time, we have measured that it doesn’t matter in terms of consumption cost whether you have a 3 or 6 kW heater. However, if you only use the hot tub on Fridays, for example, and turn off the heater during the days in between, a 6 kW heater is preferred as it heats the water faster and consumes a few kW less if the measurement is spread out over a week.
Measurement performed on a Pacific, 2500 liters, in sub-zero temperatures:
Swedish Hot Tubs designs and manufactures hot tubs and terrace pools for the Nordic climate. We supply high-quality products to all of Europe.
Org nr. 556986-2740
