Suggestion for 2x smart switches for heating and hot water scheme? (UK)

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Hi all, please bear with me for my first post. In the attached image is my first attempt at updating a conventional electric hot water/heating system in a flat to a SmartThings system. In the scheme I have shown 2x smart switches but I am completely confused regarding what to buy. The two switches will be controlled by the SmartThing hub and they simply switch existing relays open/closed as per the SmartThing hub. I understand I need a Z wave enabled switch but beyond that, I don’t know what will/will not be compatible with the SmartThing hub. The smart switches carry only a low current, they only switch relays, the relays carry the high current. For clarity, the Siemens programmer shown in the scheme could actually be entirely removed, but for now I am setting it to 24x7 ON to supply the smart switches. Anyone care to recommend smart switches please? Are any available that have a manual bypass switch too in case of network failure? Thank you.

SMART SCHEME

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There are many many things that will probably work for you but the easiest and most straightforward is probably a couple of these:

https://www.amazon.com/GoControl-Z-Wave-Isolated-Contact-Fixture/dp/B00ER6MH22

They have dry contacts. Another option if you want to be able a manly control them is to just go with a pair of standard GE and off switches and then replace your relays with some RIB relays rated for what you need to do.

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Are you in the US or the UK? The devices available vary somewhat.

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Ah, sorry. Sure, I’m in the UK. Thanks.

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I use Figaro switches for my bathroom fan.
You can get a Figaro switches with 2 outputs.
It should do the job for you.
If you go for it you will need to download a custom device handler which is very straight forward.
Let me know if you do and I can point you in the right direction.

http://www.vesternet.com/z-wave-fibaro-double-switch-2-gen5

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Thank you. I’ll look in to that.