A smart thermostat gives you precise, programmable control over your home heating - typically via an app - and learns your schedule to heat your home only when needed. The energy saving is real but modest compared to insulation or switching to a heat pump.
The Energy Saving Trust estimates smart thermostats save around £75-150 per year for a typical household, depending on your current heating habits and how well you use the smart features. The CO₂ saving is around 0.2-0.4 tonnes per year.
Hive - the most widely available in the UK, often discounted through British Gas and other energy suppliers. Works with most boiler types. Around £150-250 installed.
Tado - strong on geofencing (automatically adjusts when you leave home). Good integration with heat pumps. Around £150-200.
Nest (Google) - well-designed, strong learning features. Around £200-250 installed. Better suited to heat pump systems.
Honeywell Evohome - best for multi-zone control. Higher cost but more flexible.
For most households with gas central heating, a smart thermostat pays back in 2-3 years through energy savings. If you're planning to install a heat pump in the next few years, check compatibility first - Tado and Nest have better heat pump integration than Hive.
If you're considering a smart thermostat primarily for environmental reasons, insulation and supplier switching will have significantly larger impacts for comparable or lower cost.
Worth doing, but not a priority compared to insulation, supplier switching or heat pump planning. If you're getting a new boiler or heat pump anyway, add a smart thermostat at the same time - the marginal cost is low.
