The test began in winter 2024 with a decade-old boiler, basic scheduling, and manual valve tweaks, which used 14,316.7 kilowatt hours of gas across 213 days to cut previous baseline use by 10 to 15 percent. The household subsequently transitioned to a comprehensive Tado X setup consisting of 13 smart radiator thermostats, two wireless room sensors, and a central wired programmer. While the older boiler could not support OpenTherm flow-temperature adjustments, smartphone app scheduling and automated background controls still directed heat solely to occupied spaces. Full software automation relies on aggregated data from more than a million homes alongside paid features like window-open detec…
Key points
Smart heating controls can minimize fuel waste by restricting boiler demands to individua…: Smart heating controls can minimize fuel waste by restricting boiler demands to individually occupied rooms rather than the entire house.
Full automation requires ongoing subscription overheads alongside considerable initial ou…: Full automation requires ongoing subscription overheads alongside considerable initial outlays for smart radiator valves and expert installation.
Older heating infrastructure without OpenTherm support limits the ability of modern smart…: Older heating infrastructure without OpenTherm support limits the ability of modern smart thermostats to modulate boiler flow temperatures directly.
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Can smart thermostats and AI reduce your heating bills? Every manufacturer claims the answer is yes, quoting average savings in the 25%, or £180 a year range. But all of these promises are heavily caveated and, with energy costs changing regularly, it can be very difficult to tell what is having an impact.
To find out if technology can really help, I spent the last two years comparing my miserly manual control and basic heating schedule to an AI-governed system. The results surprised me.
I used my 1930s solid-brick house with a recent, insulated loft conversion as the test bed.
Warming up
In the winter of 2024 my heating system consisted of a 10-year-old Worcester Bosch combination gas boiler set to a medium heat, a Hive thermostat in a central hallway with its smart features disabled and 13 radiators equipped with standard thermostatic radiator valves (TRVs).
To maximise energy savings, I set a basic schedule to turn the heating on for a couple of hours in the morning and evening, turned off the TRVs in rooms we did not use…
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