Roof tanks are fresh water tanks placed atop high-rise buildings. Roof water tank systems are used in water supply applications mainly due to unstable water mains and unstable power supply. Water is provided to the roof tank via a transfer pump or directly from mains water supply.
Water is supplied to the majority of the apartments through gravity. For the apartments on the three or four uppermost floors (directly below the tank), gravity is not strong enough to create the proper water pressure. A pump is installed to solve this problem.
Grundfos supplies pressure boosting systems for commercial buildings to ensure correct water pressure from the roof water tank system.