knocking pipes

My contractor installed these CPVC pipes shown in the photo for a double vanity. When you turn on the hot water on either sink (hot water is on the left on both sinks), there is knocking that starts once the water gets hot and it doesn't stop until about 15 seconds after turning off the water...

Hi Everyone, We are in a 2 year old house. Every time the water heater turns on we hear loud knockings sound in the attic. We were able to find the pipe causing it - It's the flue pipe coming out of the water heater on the 1st floor and going upto the attic and having the exhaust out. The pipe...

I’m hearing what sounds like a water hammer in the pipes near my hot water heater(tank). With no water running, it knocks about every few seconds to a few minutes. I turned off the water heater at the breaker, electric only. Waited a day and used up what hot water was left. The knocking...

About a month back had plumber / engineer replace flow switch on Worcester Bosch oil boiler as it was leaking. I had a SureStop switch fitted some time ago due to mobility issues. Always worked perfectly. When he went to switch water back on it it was only trickling from the kitchen tap and then...