28 Jan 2026
Annual Boiler Servicing: The Pre Winter Heating Checklist Every Homeowner Should Follow
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If you want the calmest winter possible, do these three things first:
Book a yearly boiler service with a Gas Safe registered engineer
Check your pressure, radiators and thermostat now, not on the first cold day
Take carbon monoxide safety seriously, especially if you notice headaches, nausea, dizziness, or sooty marks near an appliance
That is the simple version. Here is the full checklist that keeps most households out of trouble.
Why people end up with boiler problems at the worst time
Most breakdowns are not random. They usually follow a pattern:
The boiler has been limping along, but you only notice when temperatures drop
Radiators are half warm and everyone turns the thermostat up, which puts more strain on the system
A small pressure issue or air in the system gets worse
A safety issue shows itself as a smell or a strange flame colour, and nobody is sure what to do next
A bit of preparation now makes the winter months far less stressful.
The homeowner friendly pre winter checklist
This is written so you can work down it in about 30 to 45 minutes. Anything that involves opening the boiler or touching gas components should be done by a Gas Safe registered engineer.
Step 1: Do a quick safety scan first
Before you do anything else, take 2 minutes and check for these red flags:
You can smell gas
You see dark, sooty staining on or around the boiler casing or near a flue terminal
You feel unwell in the home and symptoms improve when you leave the building
The pilot light looks yellow or orange rather than crisp blue (on appliances where you can see the flame)
If any of these apply, stop and follow official guidance. Do not try to “power through winter”.
Step 2: Book the right type of visit
A boiler service is different from a repair call out.
A yearly boiler service is a planned check that helps confirm the appliance is operating safely and reduces the risk of faults getting missed. Energy Saving Trust recommends getting a boiler serviced every year by a Gas Safe registered engineer.
If you have a current issue like repeated lockouts, banging noises, or no hot water, that is a repair and fault finding job.
Boiler Servicing and Installation
Step 3: Check your boiler pressure
Many modern boilers have a pressure gauge. If pressure is too low, your heating can struggle. If it is too high, you can get errors and leaks.
What to do:
Check the gauge and note where it sits
If it is repeatedly dropping, that is a sign something needs attention
If you are not sure what “normal” is for your specific boiler, do not guess. Make a note for the engineer
This step helps you catch issues early without touching anything unsafe.
Step 4: Bleed radiators that have cold spots
If radiators are cold at the top but warm at the bottom, trapped air is a common cause.
Energy Saving Trust provides a simple guide for bleeding radiators. It also recommends not blocking radiators with furniture so heat can circulate properly.
Simple reminders:
Turn heating off and let radiators cool
Use a key, go slowly, catch drips
If you need to bleed lots of radiators often, that can be a sign the system needs a proper check
Step 5: Make sure your thermostat and controls actually make sense
This sounds basic, but it is one of the most common reasons homes feel cold.
Quick checks:
Does the thermostat respond when you change settings
Are timers set for the way you actually live
Do rooms heat unevenly because some radiators are turned down too far
If you have thermostatic radiator valves, it can help to set them deliberately rather than leaving them random. It is the difference between “warm house” and “warm hallway, freezing bedrooms”.
Step 6: Look for these “quiet” warning signs
These are the issues that often show up before a winter breakdown:
Boiler making new noises: gurgling, banging, kettling
Radiators taking far longer to warm than usual
Hot water temperature fluctuating
Boiler cycling on and off frequently
A small leak or staining under pipework
These do not always mean something catastrophic, but they do mean it is time to get things checked before winter demand hits.
Step 7: Do not ignore ventilation around the boiler
This one gets overlooked, especially when people box things in for looks.
Boilers need proper airflow and safe dispersal of combustion products. Flue and ventilation guidance exists for a reason, and safe flue placement matters to prevent fumes re entering the home.
If you have recently renovated, built cabinetry or changed windows and vents, mention it during your service visit.
Carbon monoxide safety, explained without scare tactics
Carbon monoxide symptoms can look like flu, tiredness or a hangover. HSE lists symptoms such as headaches, dizziness, breathlessness and nausea.
If you suspect carbon monoxide poisoning:
Stop using appliances you think might be producing carbon monoxide if you can
Get outside for fresh air
Get medical advice promptly
NHS guidance sets out what to do if you think you have carbon monoxide poisoning.
If you suspect an appliance is unsafe, HSE guidance says turn it off and do not touch it until it has been checked by a Gas Safe registered engineer.
The “share this with a friend” winter heating checklist
If you want one simple message to send someone, use this:
Book a yearly boiler service with a Gas Safe engineer
Check boiler pressure now, not when it is freezing
Bleed radiators with cold tops and do not block them with furniture
Test heating controls and timers so the house warms when you need it
Watch for leaks, weird noises and repeated boiler resets
Take carbon monoxide symptoms seriously, especially headaches and nausea indoors
How Barry Turner and Son can help
If you want the heating sorted properly, we can help with planned boiler servicing, fault diagnosis, and central heating system checks, all handled by a professional team that keeps things tidy and straightforward.