Automatic bypass - s plan

[Old Account]

hello guys,

I need your brain for a second. Do i need to install an automatic bypass external of the Vaillant ecotec exclusive 627 IQ ?

It has an built in bypass and don’t see a reason to install another one below the boiler before the 2 zone valves.

Could anyone give me an idea or a help ?

Attached there are the Mis ... does anyone know whether of it’s written that I need one or not? https://www.vaillant.co.uk/download...e-green-iq-1/ecotec-exclusive-627-1060717.pdf

 

[ShaunCorbs]

No as there's no zone valves as it's a system boiler

 

[sammathias]

Are you fitting an external pump?

 

[Old Account]

Are you fitting an external pump?

No external pump. I just got a help from Shaun too. So all is sorted on my end at the moment. I was always under the impression to install an automatic bypass but some people say you fine without. I just wanted to double check what people do in here in England.

 

[Scott_D]

What is the answer Ron- Bypass or no bypass?

What is different about the IQ system to the standard System?

 

[Old Account]

What is the answer Ron- Bypass or no bypass?

What is different about the IQ system to the standard System?

Do t need the bypass as I already got a built in one. Furthermore the iq boiler doesn’t need any zone valves and comp,coated wiring no more. It’s similar designed like a combination boiler which has the flow for C.H. gas , return for C.H. , Flor to the cylinder and return to the cylinder ... it’s a Great boiler to be fair.

One thing I don’t understand why plumbing’s regs say you need an expansion vessel for the unvented cylinder ... makes no sense to me because of stagnant water. If the pressure is too high the prv will open ... but to install an exp. vessel for portable water I don’t think it should be done this way. Don’t see the point of it.

 

[sammathias]

If the cylinder your fitting doesn't have a internal bubble/expansion then yes you will need to fit an external one otherwise there would be know where for your expanded hot water to go and the prv would be discharging all the time?

 

[Sharp Point]

I don’t know if it’s true, I was told this many years ago.... in the good old US, they have unvented cylinder without expansion vessels, as the water is heated it’s allowed to weep out and down to the drains continuously as it’s heated.

 

[sammathias]

I don’t know if it’s true, I was told this many years ago.. in the good old US, they have unvented cylinder without expansion vessels, as the water is heated it’s allowed to weep out and down to the drains continuously as it’s heated.

Sounds efficient

 

[Sharp Point]

Sounds efficient

Lol, is anything in the US efficient?