Please explain the difference in S and Y systems

Irish Wolf

I don't want to cross post on the HA/IoT forum - I'm looking for advice, firstly on what the difference is between an S and Y type system. I'm fairly sure I've got neither, but I probably do have one ?

I've got a Ferolli Tempra 18 boiler, in my opinion, it is the most vanilla setup that could be had. The boiler, controlled by a mains switch, heats the room radiators and hot water cylinder (fed by the attic tank) when it is on, and does nothing when it is off. There are no controllers, programmers or thermostats connected to the system.

I wanted to hook up a tado extension kit to it, but their CS are telling me I've got a "very rare configuration"...? Also, CS are asking if it is an S or Y type system

Help?

K.Flyer

You have neither.
S and Y plans are a reference to different types of heating / hot water control zone valve systems and their respective programmers.

antoinolachtnai

It's all here:

https://www.plumberparts.co.uk/advice/heating-systems/s-plan-heating-system

You do indeed have the simplest possible setup.

John.G

antoinolachtnai wrote: »

It's all here:

https://www.plumberparts.co.uk/advice/heating-systems/s-plan-heating-system

You do indeed have the simplest possible setup.

Here's the Y plan. I suppose it can/could be used where only two zones are required, say Rads or Hot Water Cylinder or both together and only one motorized valve is required. Multiple zoning is possible with the S plan.
Is the Y plan still used?.

https://www.plumberparts.co.uk/advice/heating-systems/y-plan-heating-system

John.G

John.G wrote: »

Here's the Y plan. I suppose it can/could be used where only two zones are required, say Rads or Hot Water Cylinder or both together and only one motorized valve is required. Multiple zoning is possible with the S plan.
Is the Y plan still used?.

https://www.plumberparts.co.uk/advice/heating-systems/y-plan-heating-system

Three port valves were never really used in Ireland due to the simplicity of two ports which suits the fact two trades are required usually to wire and fit controls also hot water priority is very common in other countries making a Y plan the design of choice in the past( slightly less so know due to the plethora of heating controls out there now)