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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.
The vortex tube, also known as the Ranque-Hilsch vortex tube, is a mechanical device that separates a compressed gas into hot and cold streams. The gas emerging from the hot end can reach temperatures of 200 °C (390 °F), and the gas emerging from the cold end can reach −50 °C (−60 °F). [1]
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]
IAPMO develops and publishes the Uniform Plumbing Code (UPC); [2] Uniform Mechanical Code (UMC); Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC); and the Uniform Solar Energy and Hydronics Code (USEHC), which as of 2018 is known as the Uniform Solar, Hydronics and Geothermal Code (USHGC).
The Japanese non-vented "fan" heater burns kerosene gas and is known as a gasification type heater. The liquid kerosene fuel is pre-heated via an electric heating element to vaporize the fuel. The resulting gas is collected and forced into the burn chamber where it is ignited and burns with a blue flame, similar to propane.
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