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  2. Vaillant Group - Wikipedia

    en.wikipedia.org/wiki/Vaillant_Group

    The history of the Vaillant Group dates back to 1874, when Johann Vaillant set up a master fitter's business. In 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. [3] This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases.

  3. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Tankless water heaters can be further divided into two categories according to their heating capability: "full on/full off" versus "modulated". Full on/full off units do not have a variable power output level; the unit is either fully on or completely off. This can cause an annoying and possibly hazardous variation of hot water temperature as ...

  4. Back boiler - Wikipedia

    en.wikipedia.org/wiki/Back_boiler

    Back boilers are strictly regulated in Ireland and the UK following explosions relating to incorrectly serviced or installed back boilers. [1] A gravity circuit is commonly employed to connect the back boiler to an indirect hot water cylinder and sometimes one or more radiators. This hot water cylinder needs to be placed at a higher level than ...

  5. Boiler - Wikipedia

    en.wikipedia.org/wiki/Boiler

    A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, [1] [page needed] [2] [page needed] including water heating, central heating, boiler-based power generation, cooking, and sanitation.

  6. Hydrostatic test - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_test

    A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks. The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection , and pressurization of the vessel to the specified ...

  7. Baxi - Wikipedia

    en.wikipedia.org/wiki/Baxi

    Baxi operates three sites in the UK: Warwick, Preston and Wokingham. There are also numerous training centers nationwide, including Dartford and Godmanchester . Its investment is based on boiler products and renewable technologies , including solar thermal hot water systems, ground source heat pumps , air source heat pumps, biomass boilers and ...

  8. Water-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Water-tube_boiler

    The only railway use of water-tube boilers in any numbers was the Brotan boiler, invented by Johann Brotan in Austria in 1902, and found in rare examples throughout Europe, although Hungary was a keen user and had around 1,000 of them. Like the Baldwin, it combined a water-tube firebox with a fire-tube barrel.

  9. The Natural History of Alcoholism Revisited - Wikipedia

    en.wikipedia.org/wiki/The_Natural_History_of...

    In fact Vaillant reports the dismal fact that fully 95% of the Clinic sample had relapsed at some time during the 8-year study period. [53] [54] Vaillant noted that clinical treatment helped only in the short term, as crisis intervention and detox. There was one indicator, a financial one, of short-term success: clinical intervention had ...

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