The Great Big Boiler Test: Get Winter-Ready with Sanju's Heating
Look at you, getting ready for winter early.
Testing your boiler before the cold weather hits is a great idea — it can help you avoid an emergency call-out in a cold snap, save money on repairs, and give you peace of mind that your home will stay warm when it matters most.
So this weekend, join the nation in putting on the heating for 15 minutes to check everything's working. Or get ahead by doing your test today.
At Sanju's Heating, we believe a little preparation now beats a freezing January morning with no heating. Here's our simple five-step guide to testing your boiler — no tools required.
Why Test Your Boiler Early?
Most boiler problems don't happen overnight. They build up quietly through the summer months when your heating sits unused. By the time you switch it on in October or November, a small issue may have become a costly breakdown.
Testing your boiler early gives you time to:
- Spot faults before they become emergencies
- Book a service at a time that suits you — not in the middle of a cold snap when everyone else is calling too
- Avoid call-out fees and weekend emergency rates
- Keep your warranty valid with regular checks and servicing
Five Steps to Test Your Boiler
Follow these simple steps to check your boiler is ready for winter.
1. Check Your Boiler's Pressure
Your boiler's pressure gauge should read between 1 and 1.5 bar when the system is cold.
If it's too low (below 1 bar), your heating won't run efficiently. If it's too high (above 2 bar), you may need to bleed a radiator to release pressure.
Tip: Most modern boilers have a built-in pressure gauge on the front panel. If you can't see it, check your boiler's manual or the digital display.
2. Turn the Heating On
Turn your thermostat up and let the heating run for 15 minutes.
This gives the system time to warm up fully and circulate hot water through all your radiators. A quick two-minute check isn't enough — some faults only show once the system has been running for a while.
3. Listen Out for Unusual Noises
Your boiler should hum quietly. Any of these sounds could mean something's wrong:
- Banging or kettling — could indicate limescale build-up or a blocked heat exchanger
- Gurgling — often a sign of air in the system or low pressure
- Whistling — may suggest a pump issue or restricted water flow
If you hear anything unusual, don't ignore it. Switch off and contact a Gas Safe registered engineer.
4. Check Your Radiators
Feel each radiator in your home. They should be hot to the top.
If the top is cold but the bottom is warm, there's air trapped inside. You'll need to bleed the radiator using a radiator key.
If some radiators are cold entirely, you may have a balancing issue or a bigger system problem — worth getting a professional in to take a look.
5. Test Your Thermostat
Turn your thermostat up and down and make sure the heating responds.
If the heating doesn't switch on or off when you adjust the dial, your thermostat may need new batteries, repositioning, or replacing. A faulty thermostat can waste energy and leave you with uneven heating.
What to Do After Your Test
Leave your heating on for a little while longer to make sure everything stays working properly. If it's too warm today, give it a try on a cooler evening.
Once you're happy your boiler is running well, here's what we recommend:
- Book an annual service — even if everything seems fine, a yearly service keeps your boiler efficient, safe, and under warranty
- Bleed your radiators — if any were cold at the top
- Check your carbon monoxide alarm — replace the batteries and test it
How Did Your Boiler Test Go?
Based on what you found, here's what to do next:
Everything Is Working — Great News!
Your boiler passed the test. Book your annual service with Sanju's Heating to keep it running smoothly all winter. Regular servicing can extend your boiler's lifespan and keep energy bills down.
Something Went Wrong — Don't Panic
Unusual noises, cold radiators, or a pressure gauge that won't settle? These are early warning signs. The sooner you get them looked at, the cheaper and easier they are to fix.
My Boiler Isn't Working at All
If your boiler won't fire up, has lost pressure completely, or is showing a fault code, give us a call. Our Gas Safe registered engineers can get to you fast across Newbury and the surrounding area.
Join the Nation. Get Winter Ready.
A 15-minute test today could save you a freezing night in January. Make it part of your autumn routine — just like checking your smoke alarms and clearing your gutters.
At Sanju's Heating, we're here to help you stay warm, safe, and in control of your heating all year round. Whether you need a service, a repair, or honest advice, our Gas Safe registered team is just a call away.
Get your fixed price and book online today.
