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  2. Hot tub - Wikipedia

    en.wikipedia.org/wiki/Hot_tub

    A hot tub is a large tub full of water used for hydrotherapy, relaxation or pleasure. Some have powerful jets for massage purposes. ... (low pH). The hardness level ...

  3. Hot tub or cold plunge? Experts say there are benefits — and ...

    www.aol.com/lifestyle/hot-tub-cold-plunge...

    “Hot water, like cold water, can be uncomfortable and promote burns,” Malin says. “Temperature in many studies tends to be near 104 degrees Fahrenheit, but going well above that should be ...

  4. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

  5. Uniform Swimming Pool, Spa and Hot Tub Code - Wikipedia

    en.wikipedia.org/wiki/Uniform_Swimming_Pool,_Spa...

    Designated as an American National Standard, the Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems associated with swimming pools, spas and hot tubs as a means of promoting the public's health, safety and welfare.

  6. Matthew Perry's death puts spotlight on hot tub dangers ... - AOL

    www.aol.com/news/matthew-perrys-death-puts...

    Hot tub water temperatures should never exceed 104 degrees Fahrenheit, the CPSC noted, adding that soaking in water above that threshold can raise human body temperature to the point of heat stroke.

  7. Thermostatic mixing valve - Wikipedia

    en.wikipedia.org/wiki/Thermostatic_mixing_valve

    WW-Zulauf = Warmwasser-Zulauf = Hot water input KW-Zulauf = Kaltwasser-Zulauf = Cold water input Temperaturregler =Temperature regulator Abgang = Outlet Mengeneinstellung = Volume control. A thermostatic mixing valve (TMV) is a valve that blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures to prevent ...