Winter Boiler Preparation Checklist
Essential steps to prepare your boiler and heating system for winter
When to Use This Checklist:
Complete this checklist in September or October, before the cold weather arrives.
Don't wait until the first cold snap to discover your heating system isn't working properly. This comprehensive checklist will help you prepare your boiler and central heating system for winter, potentially saving you from emergency callouts and ensuring your home stays warm all season.
1. Boiler Checks
Check boiler pressureImportant
Pressure should be between 1 and 1.5 bar when cold. Top up via the filling loop if below 1 bar.
Test the boiler fires upImportant
Turn on your heating and hot water to ensure the boiler ignites properly without error codes.
Listen for unusual sounds
Kettling (rumbling), banging, or gurgling can indicate problems that need professional attention.
Check the flue terminal
Ensure the external flue is clear of debris, bird nests, or obstructions.
Review last service dateImportant
Book a service if it's been more than 12 months. Annual servicing maintains warranty and efficiency.
2. Radiator Checks
Bleed all radiators
Start downstairs and work up. You'll need a radiator key and a cloth to catch drips.
Check for cold spots
Run heating for 30 minutes then check each radiator. Cold spots indicate trapped air or sludge.
Test thermostatic valves
Turn TRVs to maximum and check they're controlling heat. Replace any that are stuck.
Check for leaks
Inspect all radiator valves and connections for signs of moisture or corrosion.
Consider a system flushImportant
If multiple radiators have cold spots, a powerflush can restore efficiency.
3. Controls & Thermostat
Test the thermostat
Turn up the temperature and ensure heating responds. Replace batteries in wireless stats.
Program heating schedule
Set timers for when you actually need heat - typically 30 mins before waking and coming home.
Check frost protection
Ensure your frost stat is set to 5°C to protect pipes when you're away.
Consider a smart thermostat
Upgrades like Nest or Hive can reduce bills by 10-15% through intelligent control.
4. Safety Checks
Test carbon monoxide alarmImportant
Press test button and replace batteries. CO alarms should be replaced every 5-7 years.
Check smoke alarms
Test all smoke alarms and replace batteries. Ensure one on each floor.
Clear area around boiler
Remove any items stored near the boiler that could be fire hazards.
Know how to turn off gas
Locate your gas meter and emergency control valve. Teach household members.
💡 Helpful Tips
- ✓Book boiler services early - engineers get very busy once cold weather hits
- ✓Keep your Gas Safe certificate accessible for insurance and rental purposes
- ✓Consider a boiler cover plan for peace of mind during winter
- ✓A magnetic filter on your system reduces sludge build-up and extends boiler life
⚠️ Important Warnings
- !Never attempt to repair a gas boiler yourself - always use a Gas Safe registered engineer
- !If you smell gas, turn off supply at the meter, open windows, and call the gas emergency line
- !Black marks around a boiler or yellow/orange flames can indicate dangerous CO issues
Need Professional Help?
If any of these tasks seem complex or you'd prefer professional assistance, we offer the following services:
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