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Ah, well that's solved that issue. Thanks again. I don't really know how the modulation works in OT - haven't looked into it yet. Just saw it in the manual for both boiler and smart kit so thought I'd ask. Makes sense. Thanks again.

You've been a star, thanks. I'll hook it all up tonight. Is it worth using the OpenTherm module? My boiler supports it but I'd have to get a GS engineer to do that as it looks like it would require opening the case which I think I'm not permitted under the regs from doing. Just want to weigh...

Thanks for the detailed post. Yeah, if I repurposed the grey, I'd planned to sleeve it. One of the greys at the top of the wiring centre pic is currently linked to the stat, so I'd disconnect from there and hook into where the neutral for the valve is connected down at the bottom. I guess...

Hi - new here! Bought a Drayton Wiser multizone Kit 1 for my system in an Amazon sale. Want to try out smart heating. Without further ado: Current setup Boiler:Ideal logic ESP1 30 Altech programmable thermostat / Salus RT500 Honeywell V4043 zone valve Each room stat is battery powered and has...