On July 21st of 1894, Johann Vaillant is granted a patent for the "closed system" gas water heater. For the first time, water is heated hygienically in a closed pipe system without coming into contact with the exhaust gases.

With the "Perfectus" safety fitting, the gas bath oven can only be opened when cold water runs into the appliance and the pull-out burner is pulled out of the oven.

With the Geyser, the wall-mounted version of the gas water heater, hygienic hot water preparation can be accommodated even in the smallest of spaces. Vaillant conquers the market with an innovation that endures to this day.

Vaillant's new "Auto-Brodler" heat and store between 5 and 200 litres of boiling or hot water, depending on the model. Factories, restaurants, cafés or large kitchens use the larger devices to make coffee or prepare food. The smaller auto-boilers and instant water heaters are used as wall-mounted units in medical practices or hairdressing salons, for example.

With the new ZHK central heating boiler, which Vaillant launches in 1924, all the rooms in a house can be heated from a central point using radiators. It is the beginning of central heating as we still know it today.

The appropriate product for the world economic crisis is the resource-saving "coal geyser": four lignite briquettes are enough for a full bath. It is also suitable for rooms without a gas connection and, at just under 90 Reichsmarks, is affordable even for the less affluent.

Vaillant manufactures its instantaneous water heaters, previously known under the name Geyser, as so-called trough units. Craftsmen appreciate the "Mulden-Auto-Geyser" MAG because they are easy to open and repair. The unit sheaths are no longer made of copper, but of enamelled sheet steel.

Vaillant presents the Sine Geyser. This gas water heater no longer needs a chimney connection, but can be installed in any room with an outside wall.

In addition to the gas-powered appliances, Vaillant is launching the MAG-E electric instantaneous water heater.

With the Circo Geyser, Vaillant launches Germany's first wall-hung gas heating system for flats and detached houses in 1961.

The Combi Geyser, launched by Vaillant in 1967, combines central heating and hot water supply.

Vaillant is launching an electronically controlled gas wall-mounted heater. The Combi-Geyser VCW T3W automatically adjusts its output to the heat demand.

In the mid-1980s, Vaillant launches the VKS E Calormatic, a low-temperature boiler that not only meets but exceeds the increased demands on heating systems.

The wall-hung thermoblock ecoTEC is the first condensing boiler from Vaillant. Compared to conventional appliances, condensing technology enables much better energy utilisation and reduces emissions.

The solar thermal systems that Vaillant added to its product portfolio in 1997 use solar energy to heat water.

With the first geothermal heat pump developed in-house, Vaillant shows how well climate-friendliness and comfort can be combined. The geoTHERM provides a warm house and hot water in winter and can cool rooms in summer. In the Stiftung Warentest test, the geoTHERM wins the test right away.

With ambiSENSE, Vaillant presents a system that allows the heating to be controlled automatically via an app. ambiSENSE consists of a compatible controller, the internet module, and matching thermostatic valves.

The aroTHERM plus is the first heat pump from Vaillant to use the refrigerant R290. This natural refrigerant enables significantly higher flow temperatures and is particularly environmentally friendly.