Do I need the Extension kit?
I have a gas system boiler with a Megaflow for hot water storage.
I have two wired thermostats, one for upstairs and the other downstairs.
This is all currently controller via a Hortsmann Channel Plus H47XL. This has there of the for channels in use. Upsairs, downstairs and got water. All three zones can have different timing schedules.
I'm looking to install Tado but I'm really confused around if I need the extension kit? Would this replace the Hortsmann unit? Or do I leave this in place?