Boiler Servicing in Stockton-on-Tees

“Had Hobday’s service our Worcester Bosch in Fairfield. Thorough job, explained everything, and sorted a minor pressure issue on the spot. Much better than the last lot we used.” — Stockton homeowner

We provide annual boiler servicing throughout Stockton-on-Tees, working on all makes and models from older properties in the town centre to newer estates in Norton and Bishopsgarth. A service takes around an hour and includes Gas Safe inspection (reg. 972035), efficiency testing, and necessary adjustments. We work with Stockton’s varied housing stock — Victorian terraces with aging conventional systems, 1990s-2000s combis approaching replacement age, and modern A-rated units still under warranty. Every service includes a written record for warranty purposes and landlord compliance.

What’s Included in a Boiler Service

Every annual service covers the same comprehensive checks. We start by inspecting all safety devices — gas valve, flame supervision device, and overheat thermostats. We test combustion efficiency using calibrated analyzers to verify the boiler is burning cleanly and not wasting gas. The heat exchanger gets examined for cracks, corrosion, or blockages that could leak carbon monoxide. We check all seals and gaskets for deterioration, test the ignition sequence, and verify controls and thermostats are responding correctly.

The flue gets inspected inside and out. We check it’s securely fixed, properly sealed, and hasn’t been obstructed by bird nests or debris. We test the flue for spillage to verify combustion gases are venting safely. System pressure gets checked and adjusted if needed. We clean the condensate trap on combi boilers — these block with sludge and cause lockouts. If the burner needs adjusting for optimal efficiency, we do that during the service.

At the end, we test the boiler under full load to verify everything works properly. If we find faults, we’ll explain what’s needed and provide a quote for repairs. Minor issues like low system pressure, control battery replacement, or thermostat adjustment can usually be sorted during the visit. Anything requiring parts gets quoted separately. You’ll receive a written service record detailing what was checked and any issues found.

Service	Price
Annual boiler service (gas)	From £70
Boiler service + CO alarm fitting	From £85
Boiler service + system inhibitor	From £85
Landlord gas safety certificate (CP12)	From £60
Power flush (if needed)	From £300

Why Annual Servicing Matters

Annual servicing catches small problems before they become expensive repairs. A worn seal that gets spotted during a service costs pennies to replace. Left unnoticed, it leads to water damage, failed components, and emergency callouts. We regularly find issues during routine services that would have caused breakdowns within months — faulty thermostats, blocked condensate traps, deteriorating seals, corroded connections.

Servicing maintains efficiency. Boilers lose efficiency over time as combustion drifts out of spec. A service adjusts the burner back to optimal performance, which saves on gas bills. Carbon monoxide safety is the most critical reason. Faulty boilers can leak CO — an odorless, invisible gas that kills. Annual servicing checks all the safety devices and combustion pathways that prevent CO leaks. Finally, most manufacturers require annual servicing to honor warranty claims. Skip servicing, and your warranty is void.

Brands We Service

We work with all major brands: Worcester Bosch, Vaillant, Ideal, Baxi, Potterton, Glow-worm, Viessmann, Ferroli, Ariston, Vokera, Main, Alpha, and others. Stockton has plenty of Worcester Bosch and Vaillant boilers from the 2000s — these are reaching the age where servicing is particularly important. Older properties often have Potterton or Baxi conventionals that need servicing to keep running reliably. We carry diagnostic equipment for all brands and have access to technical support when needed.

Landlord Gas Safety Certificates

Landlords are legally required to service gas appliances annually and provide tenants with a copy of the safety certificate (CP12). The inspection covers the boiler, gas meter, pipework, and any other gas appliances. We check for safe operation, correct ventilation, and secure flue installation. The certificate details what was inspected, any defects found, and confirms the appliances are safe to use. Certificates are valid for 12 months, and the next inspection must be completed before expiry. Landlords face fines and prosecution if properties don’t have valid certificates.

When to Service Your Boiler

Book servicing in late summer or early autumn before the heating season starts. This gives time to fix any issues before you need the heating daily. Servicing during summer is easier — engineers are less busy, and you won’t be without heating while repairs are done. If your boiler is under warranty, check the terms — most require servicing within 12 months of installation and then annually. Missing a service can void the warranty entirely.

Stockton’s Varied Housing Stock

Stockton’s housing runs from Victorian terraces in the town centre and Norton to post-war estates in Roseworth and Elm Tree, plus newer developments in Bishopsgarth and Eaglescliffe. Older properties often have conventional systems with separate hot water cylinders and header tanks. These need more thorough servicing as there are more components to check. Mid-age properties have combis from the 1990s-2000s — these are at the stage where annual servicing is critical to catch age-related wear. Newer estates have modern A-rated combis that are efficient but still need servicing to maintain warranty and catch any manufacturing defects.

Is boiler servicing a legal requirement?

For landlords, yes. Rental properties must have gas appliances serviced annually by a Gas Safe registered engineer, and tenants must receive a copy of the safety certificate (CP12). Failure to comply is illegal and can result in fines or prosecution. For homeowners, servicing isn’t legally required but is essential for safety, efficiency, and warranty. Most manufacturers require proof of annual servicing to honor warranty claims, so skipping services can void your cover.

Can you service my boiler if it’s not working?

If your boiler has broken down or is showing a fault code, you need a boiler repair rather than a service. We’ll diagnose the fault, fix it, and get your heating working again. Once the boiler is operating normally, we can service it to prevent future problems. Servicing is preventative maintenance for working boilers, not a diagnostic or repair service. If the boiler isn’t functioning properly, repairs come first.

What if I can’t remember when my boiler was last serviced?

Check the paperwork that came with the boiler or look inside the manual — there should be service records stamped or written in. Some engineers leave stickers on the boiler showing the last service date. If you can’t find any records, or the last service was over a year ago, book a service. It’s better to service slightly early than to let it lapse, particularly for warranty purposes.

Do I get a certificate after servicing?

Yes, we provide a written service record after every job. This details what was checked, test results (combustion efficiency, flue integrity), any faults found, and work carried out. For landlords, we issue a Gas Safety Certificate (CP12) that meets legal requirements. Keep service records with your boiler documentation — you’ll need them for warranty claims, and landlords must be able to produce them if requested by tenants or authorities.

How long does a boiler service take?

Around 45 minutes to an hour for a standard service on a working boiler. If we find faults that need immediate attention, or if the boiler has been neglected and needs extra cleaning, it can take longer. We’ll let you know if we find anything that needs addressing. Landlord safety certificates can take slightly longer as we inspect all gas appliances and pipework, not just the boiler.

Book your boiler servicing in Stockton-on-Tees via our booking page or visit our Stockton services page for other local services.