Hi. I have a microbore CH system in my flat with an 'old-style' non-condensing boiler which seems to have no drain valve. I've looked at the radiators and at all the pipework I can find above the floorboards around the boiler/pump/cylinder etc and there isn't one. I want to add a flusher for a chemical flush then add inhibitor cos I get lots of air in the system. Is there something else I should be looking for or another way of draining that I'm not aware of? Thanks for any help.
Confused!
Confused!