I have Open vent central heating system with mid-position valve for heating and hot water.
The cold feed comes from the expansion tank in a 22 mm pipe but there is no VENT pipe for any expansion of water.
I wonder whether I do have to have this pipe?
I asked the plumber who installed our boiler the question. He said that
as we have 22 mm cold feed pipe then we do not need it, but recently
I looked into the service manual and this shows a diagram that indicate that I should have it.
I am bit confused whether I should have this pipe or not?
I would appreciate a prompt reply on this issue.
The cold feed comes from the expansion tank in a 22 mm pipe but there is no VENT pipe for any expansion of water.
I wonder whether I do have to have this pipe?
I asked the plumber who installed our boiler the question. He said that
as we have 22 mm cold feed pipe then we do not need it, but recently
I looked into the service manual and this shows a diagram that indicate that I should have it.
I am bit confused whether I should have this pipe or not?
I would appreciate a prompt reply on this issue.