We have a Ruud Direct Vent Pace maker DV gas hotwater cylinder.It was installed three years ago.I have noticed that after four of us each have a shower in the evening a rumbling noise eminates briefly from the cylinder .Something I have not noticed before.I have assumed it is caused by water...
After we flush the toilet and the cistern is filling a whining noise comes and eventually goes.At first I thought it might be a loose water pipe fitting under the house .I corrected that but the noise still occours after each flush.Am now sure that the noise comes the base of the valve-plunger...