Modern district heating production typically represents a huge capital investment,

which may lose unnecessary value, if the water treatment on the system is not working optimally:

  • Coating formation
    This is a well-known problem in district heating plants. Whether caused by corrosion products or raw water ingress, the deposits will result in increased energy consumption, risk of corrosion, problems with clogging of plant components and risk of microbiological growth.


  • Corrosion
    Corrosion in district heating systems can create significant costs for the district heating utility. In the short term, corrosion of vital parts of the plant or of consumers can cause operational problems and costs. Over the long time horizon during which the distribution network must be operational, even slightly elevated corrosion rates will eventually hit the plant hard financially.
  • Microbiological liquid
    The focus of district heating companies on energy efficiency means that temperatures in the systems are generally on a downward trend. Lower temperatures mean a risk of microbiological growth, leading to biological corrosion and flow problems.


  • Sludge formation
    Accumulation tanks are a particularly vulnerable part of the modern district heating plant. Sludge formation is a present risk and the low water velocities increase the risk of corrosion and microbiological growth.

It is therefore very important that the water in the district heating system is of the right quality.



Guldager AdditiveCare - District heating systems

Guldager AdditiveCare is a comprehensive solution for water treatment in district heating systems, so that the daily operation and production of the plants are secured against operational disturbances - which is also beneficial for the long-term investments.

The AdditiveCare range includes a range of water treatment additives specifically designed to meet the water treatment challenges of the district heating operator:

  • Oxygen binders for corrosion protection and promotion of passivation
  • Coating inhibitors to prevent coating formation and energy loss from raw water ingress
  • Sludge dispersers for protection against sludging of alternators and sludge in accumulation tanks
  • Products for removal of existing coatings during normal operation
  • Microbiocides to control bacterial growth

You will always have an initial, thorough review of your district heating system, so that all aspects and problems in operation are identified - both technical and financial.

The technologies in the AdditiveCare programme are combined with Guldager's wide range of water treatment plants, dosing and control equipment, analytical and laboratory services and our extensive service catalogue. This results in a total solution that provides optimal operation of your district heating system without disruptions and with optimal operating economy.

It's a total solution, where you get a single supplier of plant, equipment, additives, advice and service.
In short: One-point-of-contact.

The benefits for you are many:

  • Minimising water loss
  • Optimal energy consumption
  • Minimal maintenance
  • Protection of fixed investment
  • Optimal operation at consumers
  • Minimising leaks


Read more about the benefits of having Guldager as your One-point-of-contact supplier for-
connection with water treatment for district heating systems.

Get started


Learn more about how to get started with Guldager AdditiveCare - the efficient water treatment for district heating systems.

Use our chat function on this page or contact us at +45 48 13 44 00 if you have any questions or would like a visit from our consultants.

Our service centre is also in contact with our service vans if you need service for your installation or emergency assistance.