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Okay, this is the end result. Can you double check if it's safe to turn on to check if it works?

I bought a brand new Secure/Horstmann HRT4 ASR-ZW thermostat with boiler switch. Manual: https://www.robbshop.nl/media/45/da/33/1670501179/SEC_SRT322_download_1.pdf Reason that I bought it was I wanted to control the heating through Home Assistant, and this was the only Z-Wave one I could find...