Founded in 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases. This was a great technical innovation at the time and Johann Vaillant had a lasting impact on the development of heating technology. Notable landmarks in the company’s more recent history include the launch of the first wall-hung circulation water heater, the Circo Geyser, in 1961, and the first wall-hung water heater with condensing boiler technology that was developed and produced in-house in 1995. Vaillant products are expertly designed and feature high energy efficiency ratings and low emissions, all with an enviable reputation for performance, quality and reliability.