Supporting district heating networks over four decades

Background

In the early 1980s, optimisation of energy resources became a key priority in Denmark. Many power plants operated with efficiencies below 40%, and excess heat from electricity production was discharged into the surrounding sea. This led to the first major district heating initiatives based on Combined Heat and Power (CHP), where surplus heat could be recovered and distributed through central networks.

The challenge

The establishment of large scale district heating networks placed high demands on pump solutions. Continuous operation, high pressures, and significant temperature variations required robust designs capable of long term performance. At the same time, the systems needed to support future expansion as networks grew and demand increased.

The solution and long term operation

IRON Pump was involved from the early stages of the district heating development. In the initial phase during the 1980s, a series of 32 pump units were installed, with capacities ranging from 24 m³/h to 2,421 m³/h. Over the following decades, IRON Pump supported the system through routine service, upgrades of existing units, and contributions to network expansions, ensuring stable operation as requirements evolved.

Outcome

Today, the district heating network in the Greater Copenhagen area extends over approximately 1,500 km of twin pipes and pump stations, supplying heating to more than 500,000 customers and covering around 20% of Denmark’s heating demand. On a national level, district heating accounts for approximately 64% of household heating. Decades of continuous operation highlight the importance of reliable pump solutions and sustained service support in large scale district heating systems.

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