Have you ever.

[onlyfitidealboilers]

Have you guys ever fitted or come across an unvented hot water cylinder, but kept the f&e tank to feed circs and ch system. Got a customer who has pipes in concrete floors !!

This customer requires 20lts per min u see.

 

[petit_pablo]

Yea not uncommon on retrofitted unvented.

Theres no reason you you cant do that as far as im aware.

 

[transam]

do u mean you want to seal the c.h system but retain the feed & exp tank
????

 

[muggles]

Haven't ever done it but see no reason why you shouldn't

Wrong way round Transam, he wants to leave the C/H system open vented

 

[45yearsagasman]

All you're doing is replacing a direct gravity cylinder with an unvented cylinder keeping the coil in the UV open vented ............No problem.

 

[dcawkwell]

No need ever to keep open vented central heating.
You have a cold main feeding the hot water tank and flow and return
to the unvented tank. So why do you have to stay vented?

 

[Whitespirit66]

So why do you have to stay vented?

Poss. because of old boiler?

No, not the missus!

 

[transam]

Old systems , pipes buries in the screed , old servo warm systems ect ect

One might need to take this into consideration prior to sealing it up ??

 

[45yearsagasman]

Old systems , pipes buries in the screed , old servo warm systems ect ect

One might need to take this into consideration prior to sealing it up ??

Exactly. A good reason to leave a suspect older system open.

 

[onlyfitidealboilers]

Thanks guys, correct chaps. Pipes in concrete floors, I don't want to pressurise this system.

Might do it like this then.

Thanks

 

[transam]

Thanks guys, correct chaps. Pipes in concrete floors, I don't want to pressurise this system.

Might do it like this then.

Thanks

you could always use a plate exchanger ie seal up boiler or use a systems boiler on 1 side of the plate , keep the other side open vented !