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  2. Harvia - Wikipedia

    en.wikipedia.org/wiki/Harvia

    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]

  3. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    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. Most potable ...

  4. Hot tub - Wikipedia

    en.wikipedia.org/wiki/Hot_tub

    The earliest hot tubs were calderas in which hot stones were placed to heat the water. [citation needed] Therma in Ikaria has been a very popular place particularly for hydrotherapy ever since the 4th century B.C. [2] The remains of wrecked marble bathtubs along with a prehistoric aqueduct that have been unearthed from this area bear ample testimony of the place's popularity in the ancient times.

  5. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Power outage: In case of a power outage, tankless heaters cannot supply hot water, unlike tank based heaters which can supply the hot water stored in the tank. LED Light Strobe effect: Most residential demand water heaters act by modulating the heating elements to match the flow rate. This is required to prevent overheating in the heating chamber.

  6. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    Air-to-air heat pumps provide hot or cold air directly to rooms, but do not usually provide hot water. Air-to-water heat pumps use radiators or underfloor heating to heat a whole house and are often also used to provide domestic hot water. An ASHP can typically gain 4 kWh thermal energy from 1 kWh electric energy.

  7. Hydronics - Wikipedia

    en.wikipedia.org/wiki/Hydronics

    The air exits the system through the air-venting valves on the radiators and on the steam pipes themselves. The thermostatic valves close when they become hot; in the most common kind, the vapor pressure of a small amount of alcohol in the valve exerts the force to actuate the valve and prevent steam from leaving the radiator.

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