Thermal energy storage is used in the council offices in The Hague. Pleuger Water Solutions supplied 2 high-quality submersible pumps. The first pump is controlled by a frequency converter and operates at a capacity of 130 m3/h to 23 m3/h in conjunction with heads of between 33 and 8 metres. The second pump operates at a capacity of 130 m3/h in conjunction with a head of 10 metres. The pumps are made from zinc-free bronze and fitted with a non-return valve.