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Clanging rads

john_58 Member Posts: 37
Hi, I have a new (to me) old house (1890's) with large cast iron rads and a modern boiler. When the temperature changes (up and down) in the rads, they all clang very loud. The holes the pipes go through are plenty large. I have installed some auto vents on the top floor rads. I don't believe it is air causing this anymore. I have given up on the modern thermostat's program and am now holding the temp at 20C. Still some clanging when the heat is called. Can i install an aquastat (i think) to constantly hold the recirc water at say 35C and run it parallel to the thermostat upstairs?


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