Don’t let a cold night be the first sign something’s wrong.
Every year, thousands of households discover their boiler has a problem only when they switch the heating back on for winter - usually on the coldest night, when engineers are in highest demand. National Test Your Boiler Day is a simple idea: test your boiler and heating now, while the weather's still mild, so any issues can be sorted before you actually need the heating. It takes a few minutes and could save you a cold, uncomfortable start to winter.
Set the thermostat as you would in winter and let it run for 15–30 minutes.
Make sure they're heating up evenly, top and bottom. Cold patches can mean trapped air or sludge build-up.
Most boilers show this on a gauge or display. Check your manual for the correct range.
Any unusual noises, leaks, or error codes on the display are worth noting.
If you notice any unusual noises, leaks, or error codes on the display, click below to reach out to our team.
Want more ways to keep your home warm and your energy bills down this winter? Our free Energy Advice pack covers heating efficiency, insulation tips, and simple changes that make a real difference.
Short videos to help you sort out common heating problems yourself.
Need help with your boiler or heating check?
Visit our resident hub for support.