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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.
Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.
All of the Nazi extermination camps operated on the territory that is now Poland, although Nazi concentration camps were built in Germany and other countries.. The terms "Polish death camp" and "Polish concentration camp" have been controversial as applied to the concentration camps and extermination camps established by Nazi Germany in German-occupied Poland.
1972-4: Vaillant takes over the College and Core City samples. 1983: Vaillant publishes The Natural History of Alcoholism: causes, patterns and paths to recovery. 1995: Vaillant publishes a new edition entitled The Natural History of Alcoholism Revisited, which includes the entire text of the 1983 edition plus new material marked "Revisited."