You would need to get out of a warm bed to turn up the TRV to heat the roomwould you not just get the same saving running round the house twice a day manually changing the setting on your existing TRV's but saving £400 initial cost and ongoing battery cost? the running around would also warm you up so win win.
Battery cost? Penny wise pound foolish comes to mind- not saying you are foolish or what ever. Just saying battery cost is minimal
Everyone has their own idea on how a system should be run. As a heating engineer have customer who turn the boiler on manually and same to put it off. Yet there are others who set the system to maintain desired temperature that would be just right and no more no less and controls are left on throughout the year with controls only firing the boiler if temperature drops below the set point
Taking this debate further, chap who has TR6 above, does not say what boiler he has. That thermostat has facilities that would enhance the fuel saved
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