Why annual servicing matters

An unvented cylinder stores water under pressure. If safety controls are faulty or wired incorrectly, temperature and pressure can rise unchecked. A yearly service by a G3 qualified engineer verifies the temperature and pressure relief valve, expansion vessel, discharge pipework, thermostats, and controls. This reduces risk, improves efficiency, and keeps hot water reliable for your home.

Legal and compliance requirements

All newly installed unvented cylinders must be notified to Building Control. Only engineers with a current G3 qualification are permitted to install and service them. The qualification lasts five years, so always ask to see a valid card before work begins. Correct notification and competent installation help protect your home and ensure compliance with regulations.

Warranty protection for up to twenty five years

Most manufacturers offer long warranties on the vessel. That protection depends on correct installation, Building Control notification, and routine servicing with records kept. If a cylinder has not been serviced annually, claims may be refused even when the fault seems unrelated. Keep your service history safe so you can show proof if you ever need to make a claim.

Real world example

A homeowner in our area recently needed a replacement for a fifteen year old unvented cylinder that had corroded at the top. The manufacturer declined the claim because there was no service history. Regular checks could not have stopped the outer shell from rusting, but the warranty terms still required annual servicing. Documentation matters.

What your annual service includes

• Visual inspection of the cylinder, controls, and pipework
• Test and verification of the temperature and pressure relief valve
• Check and re pressurisation of the expansion vessel
• Inspection of the discharge pipe route and termination
• Functional checks on thermostats, motorised valves, and wiring
• Written service record for warranty and insurance

Book your unvented cylinder service in Bourne

Keep your system safe, efficient, and compliant. Our G3 qualified engineers cover Bourne PE10 as well as Spalding, Stamford, Market Deeping, and Peterborough.

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Unvented cylinder servicing FAQs

Do unvented cylinders need servicing

Yes. An annual service verifies safety valves, expansion vessel pressure, and controls. This keeps the system safe, efficient, and compliant for homes in Bourne and across PE10.

Who can service an unvented cylinder

Only an engineer with a current G3 qualification. Always ask to see a valid certificate before work begins.

How long does an unvented cylinder service take

Allow around forty five to sixty minutes for a routine service in a typical home.

Will my warranty be valid without servicing

No. Most manufacturers require yearly servicing and proof of service to support any claim.