Fitting an Expansion Vessel

[Steelmasons]

I usually use these, comes with the washer installed you just tighten it up onto the male thread and then connect the other end on the return pipework near the boiler, they come in different lengths so just pick where you are installing the EV and see what length is best for you.

http://www.screwfix.com/p/flexible-tap-connector-15mm-x-3-4-x-500mm/96407

Not suitable for central heating.

Really ?? funny that the manufacturer states that it is and the seller sells it as such but who cares about that when you know different, what do the majority of manufacturers with internal expansion vessels use as communication hoses ?

I guess that's why we pay up to 10 times the price when fitting flexis to fan coil units..
Have a gander @ the internal bore size....these type flexis are prone to breaking down internally and blocking...just look @ the vaillant hoses...
So you're quite happy using 10mm bore hose for system expansion and contraction?

 

[ianmcd]

I usually use these, comes with the washer installed you just tighten it up onto the male thread and then connect the other end on the return pipework near the boiler, they come in different lengths so just pick where you are installing the EV and see what length is best for you.

http://www.screwfix.com/p/flexible-tap-connector-15mm-x-3-4-x-500mm/96407

Not suitable for central heating.

Really ?? funny that the manufacturer states that it is and the seller sells it as such but who cares about that when you know different, what do the majority of manufacturers with internal expansion vessels use as communication hoses ?

I guess that's why we pay up to 10 times the price when fitting flexis to fan coil units..
Have a gander @ the internal bore size....these type flexis are prone to breaking down internally and blocking...just look @ the vaillant hoses...
So you're quite happy using 10mm bore hose for system expansion and contraction?

And what size and bore hoses are used on nearly all domestic boiler communication hoses ???? we are talking a bout a domestic expansion vessel here and if the manufacturer of a domestic boiler doesnt use a flexi for their internal expansion vessel what diameter of pipe do they use ?????

 

[Steelmasons]

I'll leave it to you to work out the correct size expansion pipe for KW load.
The flexi you posted is NOT suitable for this application.