Search results

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...