cold feed pipe
 

Hi
Iam just replacing my centrel heating boiler but the system in my
house is on gravity hot water.
I have got to change it over to a fully pumped system. Does anyone
know if its ok to leave the cold feed and expansion pipes on the
cylinder coil pipes where they are and fit the pump and motorised
valves to the return line of the boiler. This would mean the vent pipe
was constantly open to the boiler but the cold fill will only have
access to the boiler through the cylinder coil and down the flow pipe
to the boiler unless the ho****er valve was open.
Thanks Roo