Friends, my central heating system (Propane) produces large amounts of air that gathers in an upstairs bedroom radiator. I must release almost half the radiator of air every couple of weeks!
I have been up in the loft space and increased the depth of header water to 6 inches in case my draining actions are introducing air. Nevertheless sitting using my PC I can hear air bubbling into the radiator most evenings!
Any ideas, Regards, Peter.