Central heating systems

The presence of oxygen in central heating water will lead to corrosion that may cause complete or partial destruction of the central heating system.

With the installation of an OxyFree protection plant the optimal binding of oxygen is secured. Thus, within a short period of time the oxygen concentration of the central heating water will be below the limit where corrosion may attack. Along with the oxygen binding, an increase of the pH value takes place, stabilising the corrosion preventing process. With OxyFree a protective layer is formed on all metal parts connected to the central heating system.

OxyFree is a process, where Electrolysis is integrated in a sub water flow in the return of the system. Thus, water with a high concentration of oxygen will be treated.


Guldager is a Danish family owned company. The company was founded in 1946 and is today a modern company, represented internationally through subsidiaries, agents and dealers. We apply decades of experience, up-to-date knowhow and cutting-edge technology to meet the many needs of our customers.


Guldager A/S is an international company committed to its customers. We are used to provide service and support to our customers all over the world. Please feel free to contact any member of the Guldager team, we are looking forward to hearing from you.

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GULDAGER A/S HEJREVANG 1-5 DK-3450 ALLERØD +45 48 13 44 00