I should have said I am replacing a leaking PRV valve .The boiler is sited in the porch and all pipework goes up,therefore when I drain down using radiator draincocks the boiler is still full,so if I were to fit adrain cock to the CH return would this work?
Where on my micro genus 27 mffi should the drain valve be fitted ?In the past I have released intto a bucket but this gets messy! I now have to fit a PSV ,so I thought this would be a good time to fit a drain valve.