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Depends on your usage. We are just in a small flat, ten year old bosch boiler (doesn't modulate afaik) but was good at the time.
Had a regular old clock on it and did normal heating things. Put tado on it 3 years ago, and then smart trv on relavent rooms. Made a fair difference to heating cost, and keeos the rooms you actually use the warmest. Also nice piece of mind you can be on another continent and just check that you haven't left the heating on, keep an eye on dew points etc.From a pro gas installer pov, yeah as Kona says, they prefer Drayton wiser as a system. From a diy smart home geek pov, hive or tado is the favorite.
Super quick one - Getting a new boiler installed next week.
Best Smart Thermostat for a combi?