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FYI Toolstation currently/still has the hot-water-controlling-model for 10 quid cheaper https://www.toolstation.com/tado0-wireless-smart-thermostat-starter-kit-v3-with-hot-water-control/p73699 (which is what I recently puchased along with 2x 4-pack TRV valves... 1 of the 4-pack didn't arrive so had to buy a 3-pack instead... so will have 7 smart valves. Still waiting on the plumber for the upstairs TRV "upgrades")
Here's my part of the IoT thread for it: https://www.lfgss.com/comments/16775467/
Ask Tado, Just did this and ordered from their webshop on amazon.
you mail them details of your boiler/pics and they advise you what you need.
they did give me a link to the installer shop for the ‘starter kit wireless smart thermostat V3 inc hot water control’ which was more expensive than elsewhere and out of stock. but i had done my own research and the hot water control model which is for S/Y plan systems with a hot water tank also works with combi boilers.
seems the UK is unique in using this kind of system so they had to offer a product that works for those kind of installs.