smart heating

I’m looking to change a Honeywell T45 to a Honeywell T6R HW. Y plan system boiler with existing thermostat in the hallway and control box next to the boiler. Can anyone tell me which wires go where and which ones will become obsolete when I take out the old rotating thermostat from the hallway...

Part 1 I have been looking for some time at various smart heating set-ups and weighing up the different options. I have a 8 Rad + towel rail system on a 32 CDI and I specifically wanted controlled valves on each radiator to allow multiple room temperatures to be configured I was an early...