Smart Thermostat Savings UK (2026)
Last updated 5 October 2026 · Prices based on the Ofgem price cap (October 2026 – December 2026)
Smart thermostats learn your routine, let you control heating from your phone and can switch off when everyone leaves. The savings come from heating fewer hours and fewer rooms — not from the device itself.
Smart thermostat payback calculator
At £220 net cost and £90 saved a year, it pays for itself in about 2.4 years.
- Net cost
- £220
- Payback
- 2.4 yrs
- 10-year saving
- £680
Simple payback = (cost − grant) ÷ annual saving, at today's price cap (26.32p electricity, 7.97p gas). Ignores future price changes.
Smart heating controls — typical costs
| Product | Typical price installed | Typical annual saving |
|---|---|---|
| Smart thermostat (single zone) | £150–£300 | £75–£110 |
| Smart radiator valves (per radiator) | £50–£80 | Adds 5–10% |
| Full multi-zone system (8 rooms) | £500–£900 | £110–£180 |
| Basic programmable thermostat | £40–£100 | £50–£80 |
What affects the cost
Current controls
Moving from no timer to smart saves most.
Household routine
Irregular schedules benefit from geofencing.
Zoning
Room-by-room control adds savings in larger homes.
Heating system
Some smart thermostats support OpenTherm for better boiler efficiency.
How to reduce the cost
- Turn the thermostat down by 1°C
- Use geofencing so heating switches off when you leave
- Add smart TRVs in rooms you use least
- Use weather compensation if your boiler supports it
Frequently asked questions
Do smart thermostats really save money?
Yes, typically 5–10% of heating costs, mainly by heating your home only when needed.
Can I install a smart thermostat myself?
Some are DIY-friendly, but wiring into a boiler should be done by a qualified engineer.
Do they work with heat pumps?
Many do, but heat pumps need different scheduling. Check compatibility first.
Will a smart thermostat improve my EPC?
Better heating controls can add a few EPC points.
Sources and methodology
Energy prices come from the Ofgem price cap for Direct Debit customers (GB average). Installation costs are typical UK ranges from installer quotes and industry guidance, rounded. Savings use today's rates and do not predict future prices.