Your boiler is one of the most important — and expensive — appliances in your home. Looking after it properly means lower energy bills, fewer breakdowns, and a longer lifespan. Here’s everything a first-time homeowner needs to know.
How Does a Boiler Work?
In simple terms, your boiler heats water which is then pumped around your home through radiators and to your hot water taps. Most modern homes have a combi boiler, which heats water on demand without a separate hot water tank.
Get an Annual Service
The single most important thing you can do is have your boiler serviced every year by a qualified Gas Safe engineer. A service typically costs £60-£100 and includes:
- Checking all components are working safely
- Cleaning key parts
- Checking for gas leaks or carbon monoxide issues
- Ensuring it’s running efficiently
Many energy suppliers and boiler companies offer annual service plans that include cover for repairs.
Check the Pressure Regularly
Your boiler has a pressure gauge on the front — it should sit between 1 and 1.5 bar when the heating is off. If it drops below 1, your boiler may struggle to heat your home.
How to repressurise your boiler:
- Turn the boiler off and let it cool
- Find the filling loop (usually a silver braided hose under the boiler)
- Open the valves slowly until the pressure reaches 1.5 bar
- Close the valves and turn the boiler back on
If the pressure keeps dropping, there may be a leak — call a Gas Safe engineer.
Bleed Your Radiators
If your radiators are cold at the top but warm at the bottom, they have trapped air inside that needs releasing.
- Turn the heating on and let it warm up fully
- Turn the heating off and let the system cool slightly
- Use a radiator key to slowly open the bleed valve at the top corner of the radiator
- Hold a cloth underneath — air will hiss out, followed by water
- Close the valve as soon as water appears
- Check your boiler pressure afterwards and top up if needed
Keep the Area Around Your Boiler Clear
Your boiler needs adequate ventilation to work safely. Don’t store items directly around or on top of it, and make sure the flue (the pipe that goes through the wall or roof) is unobstructed.
Know the Warning Signs
Call a Gas Safe engineer if you notice:
- Yellow or orange flame instead of blue
- A smell of gas
- Black marks or soot around the boiler
- Your carbon monoxide alarm going off
- Unusual noises like banging or whistling
Never ignore a gas smell. Open windows, leave the house, and call the National Gas Emergency line immediately.
Set Your Thermostat Efficiently
Setting your thermostat to 18-21°C is comfortable for most people. Every degree you turn it down saves around 10% on your heating bill. Use your timer to heat the house only when you need it.
A well-maintained boiler keeps you warm, keeps your bills down, and keeps your family safe. Don’t neglect it.