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Honestly doesn't sound all that economical from experience, I really haven't bought into these smart TRV's and think there is better ways to spend your money imo.
konastab01-
Less economical than wanting one particular room heated so upping a central wall stat and running round turning off other rads? Also, convenience. I can turn the hot water on and off from my phone or the wall stat downstairs to heat up for mini_com's bath instead of either going upstairs to the back bedroom, reaching into the airing cupboard to turn it on or off. Or setting a schedule for the hot water only for mini_com to decide that bed/bath time is an hour later/earlier than it was the previous day.
stevo_com
Yes. Each radiator and the wall thermostat are their own "zone". So if one shows a temp lower than they are set, the boiler will fire. If the other rads show as being up to temp, they will close. I have three non TRV rads; hallway, kitchen and bathroom, so if anything calls for heat, they heat up too. But the hallway one is useful as it keeps the core of the house warm/dry and the other two are tiny rads. It's nice to have a toasty/dry bathroom and the kitchen one is in the laundry area so again handy to deal with any humidity caused by the washing machine/drier.