Advantages of a S plan over a Y plan

[Paul Cockhill]

Hi

A very basic question for all you experienced plumbers, but I am curious, how beneficial would it be to change a system from a Y plan system to a S plan system?

Thanks

Paul

 

[tamz]

If you already have a Y plan fitted leave it as it is. The advantages are mainly on fitting.

 

[Paul Cockhill]

Thanks for the reply tamz, would there be any reason to change,I have heard that it is easier to diagnose faults in a S plan but surely there must be some more benefits?

Are S plans better for larger houses?

paul

 

[SimonG]

As Tamz said easier for install and easier for multi zoning, as you say larger houses. I always prefer S to Y, but thats just me.

 

[tamz]

It can be slightly more difficult to diagnose Y plan problems for those not familiar with them. In reality you learn and they are no more difficult than anything else.
Most problems with Y plans come from not understanding how they should be wired.
Y plans are only suitable for small to medium sized systems of up to around 20kw for a 22mm and 28kw for an 1" valve. Above that you really need an S plan.
When fitting an unvented cylinder to a system an S plan is better as you will still need a 2 port even if you fit a divertor valve.
Generally the installation is not as neat looking on a Y plan because of the way the valve connects and the spacing.

One advantage of a Y plan is you don't ned a bypass as one side of the valve will always be open.

 

[kimbo]

Agree with you tamz except that under building regs a Auto by pass is required whichever valve is fitted. Most gas boilers have them fitted internally but oil ones need them fitted externally to comply.

 

[tamz]

under building regs a Auto by pass is required whichever valve is fitted

Only on a Y plan if it is required by the manus

 

[fuzzy]

s plan loads better, more water can get through, lots of restriction on a Y.

 

[stevetheplumber]

im a s plan man but i wouldnt go to the bother of changing