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As requested attached is my sketch of the HW Priority using either a SP/DP Contactor. If you like you can add in a switch between the Cylinder Stat and the contactor so the HW Priority can be turned on and off as required. Using the contactor will allow your customer to still have independant control of the HW & CH; so the CH can be still be selected without HW. The only difference is that when both are on together that the HW will reheat first before the CH will heat.
SP or DP Contactors are fine. You will require DP (Or referred to as a 2 Pole contactor) if you have more than one heating Circuit - for instance upstairs and Downstairs.
I keep these in the van as they give you two options.- They have a NC and NO on the contactor so can be used for a variety of uses. - 20A 2 Pole Contactor 230V AC 1 Normally Open N/O and 1 Closed N/C Modular for DIN Rail Mounting 20 Amp: Amazon.co.uk: DIY & Tools - https://www.amazon.co.uk/gp/product/B07Q9QT9DH/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
You will need a DIN railed enclosure for them too - Wylex ESE2 IP40 2-Module Unpopulated DIN Enclosure - https://www.NoLinkingToThis/p/wylex-ese2-ip40-2-module-unpopulated-din-enclosure/32311
@fixitflav Coming back to your solution - The two issues here are one; You have to have HW & CH 'ON' together. Secondly; On your diagram you have the Cylinder Stat '2' port coming back to the clock and the clock switching this live feed. The issue here is that on most Two Channel Programmers the Live to the CH 'ON' on the back plate is supplied by the clock and not by a link. So the only way to turn the CH off would be turning the Roomstat down.
SP or DP Contactors are fine. You will require DP (Or referred to as a 2 Pole contactor) if you have more than one heating Circuit - for instance upstairs and Downstairs.
I keep these in the van as they give you two options.- They have a NC and NO on the contactor so can be used for a variety of uses. - 20A 2 Pole Contactor 230V AC 1 Normally Open N/O and 1 Closed N/C Modular for DIN Rail Mounting 20 Amp: Amazon.co.uk: DIY & Tools - https://www.amazon.co.uk/gp/product/B07Q9QT9DH/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
You will need a DIN railed enclosure for them too - Wylex ESE2 IP40 2-Module Unpopulated DIN Enclosure - https://www.NoLinkingToThis/p/wylex-ese2-ip40-2-module-unpopulated-din-enclosure/32311
@fixitflav Coming back to your solution - The two issues here are one; You have to have HW & CH 'ON' together. Secondly; On your diagram you have the Cylinder Stat '2' port coming back to the clock and the clock switching this live feed. The issue here is that on most Two Channel Programmers the Live to the CH 'ON' on the back plate is supplied by the clock and not by a link. So the only way to turn the CH off would be turning the Roomstat down.