The problem
A homeowner in Guildford reported that their booster pump was leaking. The system uses a Lowara SMB10/B/3HME07S07/M2/UK pump to maintain water pressure.
What we found
Our engineer attended the property and tested the pump. The unit was able to achieve and hold pressure correctly. However, when the safety valve was depressed, water escaped rather than air. Further investigation revealed that the booster tank had failed and was full of water. We also noted that the pressure vessel was mounted horizontally.
What we did
The engineer replaced the failed pressure vessel to stop the leak. The new tank was installed and connected to the Lowara pump. We also modified the mounting so that the pressure vessel is now positioned vertically, which is the correct orientation for this type of system.
The result
The booster pump was restored to full working order. The leak was resolved and the pressure vessel is now mounted correctly.
Why it matters
A booster pump increases water flow rate, which is essential when water needs to be raised above ground level or when mains pressure is insufficient. The pressure vessel (or expansion tank) stores pressurised water and protects the pump from frequent cycling. If the internal bladder fails, the tank fills with water and can no longer maintain pressure, leading to leaks and pump damage. Pressure vessels must be mounted vertically to function correctly; a horizontal mount prevents the air cushion from working properly. Regular inspection of the vessel and pump settings helps prevent unexpected breakdowns.
Pump repair and fault diagnosis. Lowara booster pump replacement in London.
This case study is written from the completed job record. Photographs are from the job. Customer names and addresses are not published.