How does a district heating transfer station work?
4. August 2025
Expansion joints, bending radii & linear expansion
4. February 2026
What is a buffer storage tank and when is it needed in the district heating network?
A buffer tank is, simply put, a large heat accumulator that can store thermal energy temporarily. In district heating networks, it plays a central role in better coordinating production and consumption. A buffer storage tank brings tangible benefits, particularly in the case of complex hydraulic requirements or fluctuating energy demand.
GOOD TO KNOW
Compensation for fluctuations in demand
A buffer cylinder absorbs surplus heat when more is being generated than is needed, for example at midday when solar output is high. Conversely, it releases heat when consumption is briefly higher than current generation. In this way, load peaks can be smoothed out, systems can be operated more efficiently and continuous grid operation can be ensured.
🏢 Locations in the district heating system
Buffer storage tanks are used at various levels:
Centrally in the central heating plant, to decouple heat generation from current consumption
Decentrally in larger buildings or districts to reduce the local grid load
At transfer stations, where they buffer the power peaks of individual connections
Buffer storage tanks are indispensable, especially for district heating networks with renewable energy sources such as solar thermal energy, heat pumps or biomass. They compensate for natural fluctuations and improve the integration of these sources into the overall system.
🛠️ Technical advantages
Hydraulic decoupling of different network sections
Protection of heat generators, e.g. through less cycling of heat pumps
Improved controllability and system stability
Reduced heat loss through demand-based feed-in
Buffer tanks are usually cylindrical, well insulated and, depending on the application, can hold between several hundred and several thousand liters of water.
🌱 A key to the heating transition
Buffer storage tanks are an essential component of modern, sustainable district heating systems. They make it possible to use renewable energies efficiently, operate the grid stably and ensure security of supply even at peak times. In this way, they directly support the goal of a climate-neutral heat supply in Switzerland.
