Jobs & Education2 mins ago
noisy central heating
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For more on marking an answer as the "Best Answer", please visit our FAQ.You might have sludge in your system. This can be cured by draining it down, putting in an anti sludge treatment, running hot and then draining down again.
You might have a piece of pipe under the floor that vibrates on a joist. You would need to track this down and pad the offending pipe.
Our system had a knock in it for years which we thought was a pipe on joist problem that we couldn't find. A couple of years ago we had thermostatic rad valves fitted which means that we keep the boiler thermostat and the old wall thermostat set high and control the heat at individual radiators. Result is lower heating bills and a quiet system!!!