how do i stop my water storage combi tank from making a loud whining noise?

Wendy, you could try closing the incoming stopcock slightly, or replace the ballvalve on the water storage tank. It may be that some additional pipe clips are required on the pipework in the property, or that some pipes could be secured too tightly to floor joists etc causing them to rub on opposing surfaces when water is drawn from taps etc

Fido
May 2009