Unvented cylinder servicing

Many homeowners don’t realise that unvented hot water cylinders should be serviced every year. Regular servicing keeps your system safe, efficient and reliable – and catches worn components before they turn into costly problems.

What an unvented cylinder service involves

An unvented cylinder stores hot water under mains pressure, so its safety devices need regular checking. During a service, our G3-certified engineers:

• Inspect and test the key safety devices
• Check the expansion vessel
• Inspect the immersion heater and anode (where fitted)
• Confirm the cylinder is operating as the manufacturer intended

Why annual servicing matters

• G3 Certified engineers carrying out the work
• Professional servicing, repairs and maintenance
• Helps prevent costly breakdowns
• Keeps your hot water system running safely and efficiently

Don’t wait until you’re left without hot water or facing an expensive replacement. If your cylinder is due its annual service – or you’re not sure when it was last checked – it’s worth booking in.

Frequently asked questions

How often should an unvented cylinder be serviced?
Once a year, by a G3-qualified engineer.

Why does it need a qualified engineer?
Unvented cylinders are pressurised, so their safety devices legally require servicing by a G3-certified engineer.

What areas do you cover?
King’s Lynn, Norwich, Dereham and across Norfolk.

Is your cylinder due its annual service? Learn more about our boiler, cylinder and heating servicing or contact EPH Services.