Now it's happening in the day time too! Do I need a valve to control pressure to the cistern? (So that's how you spell it!) Please help me someone! I have no experience whatsoever with this stuff.
It's 5am and I am awake now because what appears to be the hot water pipe coming from the solar driven hot water systern suddenly started vibrating violently at about 1 minute intervals sending shock waves throughout the house! I found a tap that turns off the cold water supply to the systern...