The District Heating Transition Needs Components That Will Last for the Next 50 Years
In Germany, all major cities are required to have completed their municipal heating plans by June 30, 2026. After that, the structured expansion of district heating networks will begin – under considerable cost and time pressure. Municipal utilities and local governments face the task of specifying components that will function reliably for decades. Critical to this are connection sleeves that join pipe segments in district heating networks. If these components fail, moisture penetrates the system, resulting in heat loss, corrosion, and costly maintenance during ongoing operations.
Radiation-Crosslinked Shrink Sleeves for Long-Lasting District Heating Networks
The choice of material significantly influences the service life and operational reliability of district heating networks and determines potential follow-up costs. Radiation-crosslinked sleeves achieve a service life of over 50 years and are considered the technical standard for permanently tight connections. BGS has been irradiating plastic components with electron beams for over 45 years and collaborates with leading manufacturers of district heating shrink sleeves from Germany and Europe.
Billions in Investments Despite Tight Budgets – Subsidies Provide Momentum
The existing district heating network in Germany is set to be expanded from its current length of approximately 22,000 kilometers to 73,000 kilometers by 2045, requiring investments of over 43 billion euros by 2030 alone (Gutachten “Perspektive der Fernwärme” – www.vku.de). Each new kilometer of pipeline requires dozens of sleeves. For municipalities, which often have to operate on tight budgets, this poses a significant challenge. Federal funding for efficient heating networks, a subsidy program known as BEW, was increased by 400 million euros in March 2026 to a total of 2.7 billion euros (Klimaschutzprogramm 2026 – www.bundesumweltministerium.de), after the previous funding round had already been nearly exhausted by the end of 2024 (Fernwärme in Deutschland 2026 – www.handelsblatt.com). Meanwhile, just 530 municipalities have completed their heating plans, with nearly half of all municipalities still working on theirs (Statusbericht Kommunale Wärmeplanung in Deutschland – www.deea.de).
Durable Components Reduce Operating Costs over Decades
“Without radiation-crosslinked sleeves, modern district heating networks are not future-proof,” says Dr. Andreas Ostrowicki, Managing Director of BGS.
Radiation-crosslinked sleeves remain permanently leakproof even under temperature fluctuations and mechanical stress. A service life of over 50 years makes investments predictable. Ensuring that connections fit precisely without welding also reduces time and labor costs on the construction site. Radiation-crosslinked components pay for themselves through lower installation costs, longer maintenance intervals, and greater supply reliability – a relevant factor for municipalities with tight budgets.
Which specifications and dimensions are suitable for a given district heating network depends on the individual conditions, the planned operating temperatures, and local network characteristics. BGS supports manufacturers in the production of radiation-crosslinked components. To this end, the company operates electron accelerator facilities at three German locations for the crosslinking of all standard sleeve sizes, including the corresponding quality assurance.
How Radiation Crosslinking Works
Radiation crosslinking using electron beams permanently alters the molecular structure of the plastic without the use of chemicals. Through this irradiation, the plastics extruded into hoses or sleeve bodies acquire what’s called a “memory effect”: When an installed sleeve is later heated, it shrinks in a controlled manner back to its pre-crosslinking dimensions, connecting pipe systems with a precise fit and a watertight seal.
“Our systems can crosslink sleeves with diameters of more than 500 millimeters, covering the entire range used in modern district heating networks,” says Dr. Ostrowicki. “Shrink sleeves crosslinked by electron beam are not a niche product, but a fundamental building block for implementing municipal heating planning.”