I have a 120,000 BTU cast iron boiler in a bungalow. I have loud intermittent water hammer in the CH pipes. All bar one radiator have thermostatic valves. The hammer can be eliminated by opening or closing a radiator valve but usually returns. The pump is at its lowest setting and I have bled the radiators. This is an open system (i.e. with expansion tank)
Any help please? and thank you in anticipation.
Any help please? and thank you in anticipation.