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An update The hot water tank is 180 litres on an unvented system. There are 4 pipes going into the top of the cylinder. There doesn’t seem to be any pipes coming into from the side or bottom of the tank. Last night was able to identify the HW (2 way) motorised valve and the CH (2 way)...

Guys thanks for the quick response. Agile - no I haven't bled the pump, I didn't know you could do that. I'll take a good look around the FAQ. Kevplumb - vent. Sorry I know what vent means, just not sure how to do it. Will there be a vent on the cylinder somewhere (just like bleeding a...

Hi All, We have an unvented central heating system (house built in 1996) Changed a bathroom upstairs radiator on Sunday afternoon. As I had to cut the pipes (to replace 8mm micro bore with 15mm) I partially drained the central heating system by turning the off the stop valve on the small...

Hi All, this is my first post. My house built in late 1996 has 15 mm copper pipes going to all upstairs radiators but as the 15 mm flow and return pipes approach each radiator it reduces down to 8 mm microbore. Is there any technical reason for this i.e. flow rate / pressure, balancing the...