Pressurising vented heating system

[Matt887]

If pressurising a vented heating system. Will the coil for the primary flow and return of a copper cylinder take the pressure of a sealed system. Or is this a no? Thanks.

 

[cross thread]

Design to take the pressure ,but nobody knows for certain

 

[terryplumb]

The copper cylinder can not be converted to a pressurised cylinder / unvented ,if that's your intention ??

 

[Matt887]

No sorry, the hot water will still be vented. Its the central heating that am looking at pressurising. So just the primary coil that am concerned about.

 

[terryplumb]

Thats ok ,the cylinder itself isn't pressurised. If it is a very old system / cylinder it may be an issue , I think it's a limited possibility

 

[Matt887]

A limited possibility that it maybe a problem?

 

[terryplumb]

Yes, it may be a problem if it is a very old cylinder 25 years +. Even then it's only a possibility . The worst thing that could happen is the coil could develop a pin hole leak ,and you will need a new cylinder. The fact is no one can tell for sure one way or the other.

 

[rbranco]

Unless you can be sure of all the piping joints under the floors etc is good, ide leave it as unpressurised as you do not want a weak joint popping.

 

[Matt887]

It's an old floor standing boiler for a wall hung one. And can't get 3meters from the top of the boiler to water level in header tank. And can't raise the header. So a strong likely hood it may pump over.

 

[ianmcd]

the indirect coil is simply a coil of copper pipe with no joints it will be fine on a pressurised system