14/09/2026
# Pre-Winter Heating Check: A Simple Guide
With the colder autumn months coming we have put together a homeowner-friendly check to make sure your heating system is ready for winter.
# # 1. Firstly, check the boiler pressure gauge
Find the pressure gauge on the front of the boiler. It should read between 1 and 1.5 bar when the heating is cold (check your manual, as some boilers want slightly different figures). If the needle is in the red zone or the pressure is showing below 1 bar, the system may be under-pressurised.
# # 2. Top up the pressure if needed
Most boilers have a filling loop (a small flexible hose or valve, often silver or grey with two taps, near the bottom of the boiler). With the heating off and cool, slowly open the valve(s) until the gauge reaches around 1.2 bar, then close it firmly. Never leave it open.
# # 3. Turn the heating on and let it run
Set the thermostat above room temperature so the system fires up and runs for 15 - 20 minutes. This gives water time to circulate before you check them.
# # 4. Feel each radiator top to bottom
Run your hand (or the back of your hand) from the top of the radiator to the bottom, be careful as some larger radiators will get hot. It should feel evenly warm all the way down.
# # 5. Bleed any radiator that's cold at the top
Use a radiator bleed key on the small valve at the top corner. Turn slowly a quarter turn until you hear a hiss of escaping air, then a trickle of water, close it immediately at that point. Have a cloth ready to catch drips.
# # 6. Clean the radiator fins
Most radiators will have metal fins that allow the heat to radiate out. Make sure that these are as clean and free from dust and debris as possible.
# # 7. Recheck the boiler pressure after bleeding
Bleeding radiators releases a small amount of water, which drops system pressure. Check the gauge again once you're done and top up slightly if it's fallen below 1 bar.
# # 8. Note any radiators cold at the bottom
If bleeding doesn't fix it and the bottom stays cold, that's usually sludge build-up rather than air, and bleeding won't help. It may need a power flush from a professional.
# # 9. Check each TRV is set sensibly
Thermostatic Ra