Y plan or S plan for unvented cylinder and boiler

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I have an old combi boiler at the moment so as far as I understand it I don't have a Y or S plan system.

I'm looking to have a Vaillant unvented cylinder and system boiler installed and wondered which was best Y or S plan? What are the pros and cons? Are there alternatives?

What does the Vaillant VR 65 control centre contribute? Is this just a box containing all the wiring?
 
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I have an old combi boiler at the moment so as far as I understand it I don't have a Y or S plan system.

I'm looking to have a Vaillant unvented cylinder and system boiler installed and wondered which was best Y or S plan? What are the pros and cons? Are there alternatives?

What does the Vaillant VR 65 control centre contribute? Is this just a box containing all the wiring?

How many hot water outlets do you have?
Do you really need this system or do you just want it?
If you need/want it go with the Y as less to go wrong in the long term!
Where in Yorks are you?
 
It's a system that has been recommended to me and I'm just trying to understand a little more about it. The equipment does look very good.

From reading articles I got the impression that with the Y plan only hot water OR heating is available at any time, not both, which seems to be a restriction to me or am I misunderstanding.
 
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It's a system that has been recommended to me and I'm just trying to understand a little more about it. The equipment does look very good.

From reading articles I got the impression that with the Y plan only hot water OR heating is available at any time, not both, which seems to be a restriction to me or am I misunderstanding.

You are misunderstood
Y plan can do both at the same time just as an S Plan can however you only ever have one valve to go wrong instead of two.
 
Personally i wire most things now days as S plan,so you can add as many zones as you like,for instance up stairs down stairs the conservatory and hot water,add as many as you like to it as well

Y Plan obviously is not as versatile,but the choice is yours
 
You need a two port valve for the hot water side on an indirect unvented cylinder so you might as well go for the S plan.
 
Y plan is suitable up to 26kw only.

We always fit S plan's now regardless, easier to wire, simpler in design.

As said though, the unvented cylinder needs to have its own zone valve, so you would be better off using an S plan.

Also, you could use your existing combi to run an S plan, no need for a replacement boiler if the existing is sound.

Sam
 
Y plan is suitable up to 26kw only.

We always fit S plan's now regardless, easier to wire, simpler in design.

As said though, the unvented cylinder needs to have its own zone valve, so you would be better off using an S plan.

Also, you could use your existing combi to run an S plan, no need for a replacement boiler if the existing is sound.

Sam

Exact system i have at home.
I have a Baxi Duo Tec running a cylinder.
 
even if you do decide to fit a y plan valve you still need to fit a two port valve on the flow to the cylinder as a fail safe G3 regulations this helps to prevent the cylinder taking the side of your house out when it explodes .....fit an s plan
 
The boiler will be 30kW or 37kW, so that and the fact that the cylinder needs its own zone valve would suggest the Y plan is out, so I wonder why the installer mentioned the Y plan!
 

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