We have a combo boiler with a timer control thing and a very old dial thermostat in the hall, which I'm not entirely sure is working properly. Thinking about whether we should replace it with a smart thermostat. I definitely don't want a Hive or a Nest. Have looked at Honeywell which seems well reviewed. What are the benefits exactly? The heating, when on, is timed. How exactly does a smart thermostat help to save us money?
Also, who do I get to install it? An electrician or a gas engineer?