Unvented Cylinder Service in Sevenoaks
Many of the larger homes in Sevenoaks use unvented hot water cylinders to deliver mains-pressure hot water for powerful showers and fast-filling baths without the need for a loft tank. Properties in Kippington, Wildernesse, and the detached homes along Seal Hollow Road commonly feature Megaflo, Gledhill, or Worcester Bosch unvented systems, often paired with system boilers to serve multiple bathrooms. These cylinders require annual servicing by a G3-qualified engineer — and that is a qualification not every plumber holds.
At Ability Plumbing & Heating, our engineers hold the G3 certification required by Part G3 of the Building Regulations, making us legally authorised to service, repair, and install unvented cylinders in Sevenoaks and across Kent.
Call 01732 904098 to book your unvented cylinder service in Sevenoaks.
Why Sevenoaks Properties Often Have Unvented Cylinders
Sevenoaks is an affluent area with a high proportion of larger homes. These properties typically have multiple bathrooms and demand strong, consistent hot water pressure throughout. Unvented cylinders meet this demand by connecting directly to the mains water supply, eliminating the pressure limitations of traditional loft-fed systems.
However, because these systems store hot water at mains pressure, they incorporate multiple safety devices — temperature and pressure relief valves, expansion vessels, and high-limit thermostats — that must be tested annually. Failure to service these devices can lead to water damage, reduced performance, or warranty invalidation. Megaflo cylinders come with a 25-year warranty, but only if serviced annually by a G3-qualified engineer.
What Is Included in Our Service
- Temperature and pressure relief valve (T&P valve) manual test
- Expansion vessel pre-charge pressure check and re-pressurisation if needed
- Tundish and discharge pipework inspection
- Immersion thermostat function check
- High-limit thermostat (energy cut-out) test
- Pressure-reducing valve check (where fitted)
- Check valve (non-return valve) inspection
- Visual inspection for leaks, corrosion, and damage
- Written service report
Unvented Cylinder Service Cost in Sevenoaks
Annual unvented cylinder servicing starts from around £120. If any repairs are needed (valve replacement, expansion vessel re-pressurisation), we provide a clear quote before proceeding.
Local Coverage
We service unvented cylinders across Sevenoaks and surrounding areas including Seal, Kemsing, Otford, Riverhead, Dunton Green, and Weald.
Frequently Asked Questions
Unvented Cylinder Service in Sevenoaks
Protect your unvented cylinder warranty. Call 01732 904098 to book a G3-qualified service in Sevenoaks.