I am considering cleaning out my 8,5 year old heating system and refilling with corrosion inhibitor.
I've had a good look around the plumming and it appears to be a closed one, fired by a Potterton Suprima gas boiler. It is so closed that I'm unable to locate any drain or filling valves.
I also feel the circuit pressure may be low at 1bar.
So, I would greatly appreciate if anyone had advice on draining & filling of the system and the advised pumping pressure.
Many thanks, Brian