Winter has a habit of exposing problems that have been quietly building up all year. A boiler that’s been “mostly fine” through summer can struggle as soon as the temperature drops and the heating is working harder every day.
Getting your heating system winter-ready doesn’t need to be complicated or expensive. A few simple checks and small jobs done early can help avoid breakdowns, cold mornings and emergency call-outs when engineers are busiest.
This guide walks you through what to do, step by step, in plain language.
Why preparing early matters
In winter:
- Boilers run for longer
- Radiators are used daily
- Small issues turn into big problems quickly
Most winter breakdowns could have been spotted or prevented earlier in the year. Preparation is about reducing risk, not just comfort.
Step 1: Book your boiler service before winter starts
If you do one thing, do this.
What to do
- Book an annual boiler service in late summer or early autumn
- Avoid waiting until the first cold snap
Why it matters
- Engineers are less busy outside peak winter
- Problems can be fixed before you rely on heating every day
- Your boiler will run more efficiently when demand increases
If your boiler hasn’t been serviced in over a year, winter is the worst time to find out something’s wrong.
Step 2: Turn the heating on early and test it properly
Don’t wait for the first freezing morning.
What to do
- Turn your heating on for 20–30 minutes.
- Walk around the house and check every radiator.
- Make a note of:
- Cold spots
- Radiators not heating at all
- Strange noises
- Slow warm-up times
Why it matters
This gives you time to fix issues while the weather is still mild, rather than discovering problems when you need heat urgently.
Step 3: Bleed radiators that aren’t heating evenly
Air trapped in radiators is very common after months of inactivity.
Signs a radiator needs bleeding
- Cold at the top, warm at the bottom
- Gurgling or bubbling noises
What to do
- Turn heating off and let radiators cool.
- Use a radiator key to open the bleed valve slightly.
- Let air escape until water flows steadily.
- Close the valve and wipe clean.
- Check boiler pressure afterwards and top up if needed.
Why it matters
Radiators full of air don’t heat properly, which makes your boiler work harder and increases running costs.
Step 4: Check boiler pressure
Low or high pressure can stop heating working properly.
What to do
- Look at the pressure gauge on your boiler.
- Many systems run best at around 1.0–1.5 bar when cold.
- If pressure is too low, topping up is usually done via the filling loop (follow your boiler guide).
- If pressure keeps dropping, it’s a sign of an underlying issue.
Why it matters
Correct pressure helps hot water circulate properly around your heating system.
Step 5: Test your thermostat and controls
Controls that worked last winter might not behave the same after months of non-use.
What to do
- Increase the thermostat temperature and check the boiler fires up
- Lower it again and make sure the heating switches off
- Test timers and programmes
- Replace thermostat batteries if needed
Why it matters
Faulty controls can lead to heating running when it shouldn’t, or not coming on at all.
Step 6: Set your heating schedule for winter
Heating left on constantly is expensive and unnecessary.
What to do
- Review your daily routine.
- Set heating to come on only when you’re usually home.
- Start with two time blocks:
- Morning
- Evening
- Adjust gradually rather than overthinking it.
Why it matters
A sensible schedule keeps your home comfortable without wasting energy.
Step 7: Check radiator valves and room temperatures
If you have thermostatic radiator valves (TRVs), winter is the time to use them properly.
What to do
- Keep living areas comfortable
- Turn down radiators slightly in spare rooms and hallways
- Avoid turning rooms completely off
Why it matters
Heating rooms differently reduces energy use while keeping the home evenly warm.
Step 8: Look for draughts and heat loss
Before winter hits, stop heat escaping.
What to check
- Gaps around doors and windows
- Loft hatch seals
- Chimneys (if not in use)
- Cold air coming through letterboxes
Simple fixes
- Draught excluders
- Door brushes
- Thermal curtains
Why it matters
Your boiler shouldn’t have to work harder because warm air is leaking outside.
Step 9: Insulate exposed pipes
Frozen pipes are a common winter issue, especially during cold snaps.
What to do
- Identify pipes in lofts, garages or outside walls
- Add foam pipe insulation (cheap and easy to fit)
- Check insulation hasn’t slipped or degraded
Why it matters
Frozen pipes can burst, causing leaks and boiler shutdowns when you need heating most.
Step 10: Know the warning signs to act on quickly
Don’t ignore early signs of trouble.
Watch out for
- Boiler cutting out
- Unusual noises
- Radiators needing frequent bleeding
- Pressure dropping repeatedly
- Heating taking longer to warm up
Why it matters
Small issues tend to worsen in cold weather. Early attention often prevents a breakdown.
Key takeaways
- Test your heating before winter, not when it’s already cold.
- Book a boiler service early to catch issues before peak demand.
- Bleed radiators and check pressure for even heat distribution.
- Set sensible heating schedules to stay warm without wasting money.
- Tackle draughts and insulate pipes to protect your system.
- Act on warning signs early to avoid winter emergencies.
