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Hot tubs are usually heated using an electric or natural gas heater, though there are also submersible wood fire hot tub heaters, as well as solar hot water systems. Hot tubs are also found at natural hot springs; in this case, the water may be dangerously hot and must be combined with cool water for a safe soaking temperature.
In May 2021, Harvia acquired Kirami, a manufacturer of hot tub heaters, [25] and in August, Sauna-Eurox, a sauna stone company. [26] Between March 2020 and August 2021, Harvia's share price increased by as much as 580 percentage. The company's turnover was 170 million euros. [27] The expansion of the heater factory in Muurame was completed. [28]
It is the largest hot tub manufacturer in Europe [1] with eight factories, the largest being in Italy. [3] The company was founded in 1915 by seven Italian immigrant brothers from the Jacuzzi family in Berkeley, California. [4] It developed a variety of products including pumps for agricultural use.
Such water heaters are often fitted with an auxiliary electrical immersion heater for use if the boiler is out of action for a time. Heat from the space-heating boiler is transferred to the water heater vessel/container by means of a heat exchanger, and the boiler operates at a higher temperature than the potable hot water supply.
In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.
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