When it comes to keeping your UK home warm without overspending on energy bills, the question of what temperature should the thermostat be set at is one of the most searched topics for homeowners and landlords alike. Getting this right delivers year-round comfort, protects your boiler, and can cut heating costs significantly.
If your current boiler struggles to hold steady temperatures or runs constantly to hit your preferred setting, it could be time for an upgrade. Request a free boiler quote from Boilers 2 Go today and discover modern, efficient systems that maintain the perfect temperature with less effort.
What Is the Ideal Thermostat Temperature for UK Homes?
The ideal thermostat temperature for UK homes sits between 18°C and 21°C, according to the Energy Saving Trust. This range strikes the perfect balance between comfort and energy efficiency for most households.
Lowering your setting by just one degree from 22°C to 21°C can save around £90 a year on bills in Great Britain. Every extra degree above 21°C adds roughly 10% to your heating costs, so sticking to the lowest comfortable level pays dividends.
What Temperature Should the Thermostat Be Set at During Winter?
The thermostat should be set at 18–21°C during winter for the main living areas, with many experts recommending 20°C as a sweet spot for daily use. The key is consistency rather than blasting the heating when it gets cold outside.
A steady temperature prevents the boiler from working harder to recover from big drops, and it also reduces the risk of condensation and mould.
What Temperature Should the Thermostat Be Set at for Bedrooms and Other Rooms?
Bedrooms benefit from 16–18°C for adults (slightly warmer at 18–20°C for babies or elderly household members), while living rooms work well at 20–22°C and bathrooms at 22–23°C. Kitchens and hallways can sit lower at 18–20°C and 15–18°C respectively.
Use thermostatic radiator valves (TRVs) on every radiator to fine-tune each room individually. Set the main room thermostat to your living-area target, then turn down TRVs in bedrooms and unused spaces to the lowest number that still feels comfortable (typically 2–3 on the 0–6 scale).
What Temperature Should the Thermostat Be Set at Overnight?
Overnight, drop the thermostat by 2–3°C to around 15–18°C or use a programmable or smart thermostat to create a night-time setback. This cooler bedroom temperature supports better sleep, reduces energy use while you’re tucked under the duvet, and still prevents pipes from freezing.
Many households programme the heating to come back on 30–60 minutes before wake-up time so rooms feel cosy without running all night.
How Do Landlords Need to Consider Thermostat Temperatures for Rental Properties?
Landlords must ensure the heating system is in good working order and capable of maintaining adequate temperatures—guidance points to at least 18°C in bedrooms and 21°C in living rooms when the outside temperature is around -1°C.
There is no strict legal minimum temperature, but properties must be fit for habitation under the Homes (Fitness for Habitation) Act. Providing a reliable boiler and clear instructions on controls helps tenants stay comfortable and avoids disputes.
What Are the Advantages of Smart Thermostats for Precise Temperature Control?
Smart thermostats learn your routine, let you adjust settings from your phone, and can create room-by-room zones when paired with smart TRVs.
They prevent the heating from running when the house is empty, optimise boiler run times, and often deliver extra savings of 10–20% compared with manual controls. Popular UK options include Hive, Tado, Google Nest, and Honeywell models that work seamlessly with most modern boilers.
Ready to Upgrade Your Boiler for Reliable Thermostat Performance?
If your existing boiler is more than 8–10 years old, struggles to reach the set temperature, or runs inefficiently, a new A-rated or heat-pump-ready model can transform how easily you hit and hold your ideal settings. Boilers 2 Go specialises in supplying and installing high-efficiency boilers across the UK with free quotes, expert advice, and full aftercare.
Request your free, no-obligation boiler quote from Boilers 2 Go today and enjoy a warmer, cheaper-to-run home this winter and beyond.
FAQs
What temperature should my hot water cylinder thermostat be set to?
Set it between 60°C and 65°C. This kills legionella bacteria while still being safe to use and avoiding scalding risks.
Do I need a thermostat in every room?
No. One main room thermostat plus TRVs on radiators gives excellent control. Full multi-room smart zoning is optional for larger or multi-occupancy homes.
How often should I have my boiler serviced in relation to temperature settings?
Annual servicing by a Gas Safe engineer is recommended. A well-maintained boiler reaches and holds your chosen thermostat temperature far more efficiently.
Can poor insulation mean I need a higher thermostat setting?
Yes. Draughts, missing loft insulation, or uninsulated walls force the heating to work harder. Improving insulation lets you lower the thermostat while staying just as warm.
Will a new boiler automatically give me better temperature control?
Modern boilers with modulating burners and low-temperature operation pair brilliantly with smart controls and maintain steady temperatures with less energy.
I’m Penny North, a home energy heating expert. My mission is to demystify new boilers and complex heating systems to help you achieve a warm, cosy home with lower energy bills and a smaller environmental footprint.