The water contains 6 grams of dissolved mineral salts per liter, primarily sodium chloride.
The high iron content is responsible for the deep orange-brown coloring on the basin walls.
The name 'Kochbrunnen' translates literally to 'boiling spring' due to the high temperature of the water.
The current structure replaced several earlier pavilions, including a rotunda destroyed by fire.
Thermal water from the Kochbrunnen has been used historically for treating respiratory and rheumatic conditions.
The spring feeds into the nearby spa district infrastructure.
The Kochbrunnen is the most famous of Wiesbaden's 26 thermal springs, recognized by its distinct high-mineral salt content and iron-rich reddish deposits. The spring delivers approximately 346 liters of thermal water per minute at a constant temperature of about 66 degrees Celsius. The current neo-classical temple structure was built in 1888 to shelter the source. The water originates from a depth of over 1,500 meters, rising due to natural pressure through fissures in the rock. The plaza, known as Kranzplatz, historically served as the center of Wiesbaden's elite spa culture. Visitors can observe the steaming water flowing into a basin where the mineral deposits accumulate on the stone surfaces. The spring is managed by Mattiaqua, the municipal spa and water utility, which monitors the water quality and output. The site remains a functional geological feature rather than a swimming facility.
From the edge of the pavilion looking across the basin toward the steaming water spout.
Bring a small cup if you wish to smell the water, but do not attempt to drink it without medical guidance.
Visit during cooler morning hours to see the steam rising against the architecture.
Look for the smaller, secondary stone fountain nearby which allows for a closer view of the mineral buildup.
Do not attempt to touch the water directly, as it can cause burns due to the high temperature.
