G3 Unvented Hot Water Cylinder Installation & Servicing

G3 qualified installation and servicing of unvented hot water cylinders. Mains-pressure hot water safely installed across East Sussex.

G3 QualifiedGas Safe Reg. 979554Building Regs CertAll Major Brands

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About Our Unvented Cylinders (G3) Service

Unvented hot water cylinders deliver mains-pressure hot water to every outlet in your home — no cold showers, no loss of pressure when taps are used simultaneously. Installation and servicing of unvented systems is strictly regulated and must only be carried out by G3 qualified engineers. At A&O Plumbing and Heating, we are fully G3 qualified and experienced in installing and servicing all major brands of unvented cylinder, including Megaflo, Albion and Range Cylinders.

Why Choose A&O for Unvented Cylinders (G3)?

G3 qualified engineers — legally required for this work
All major cylinder brands installed
Annual servicing packages available
Full Building Regulations compliance
High-pressure hot water throughout your home
Improved shower performance

Our Process

Survey

We assess your property to confirm suitability for an unvented system.

Product Selection

We recommend the right cylinder size and brand for your household.

Installation

Professional installation with all necessary safety devices fitted.

Commissioning

The system is commissioned and all safety devices tested.

Building Regs Certificate

We provide your Building Regulations compliance certificate.

Frequently Asked Questions

Do I need a G3 qualified engineer?

Yes — it is a legal requirement. Only G3 qualified engineers may install or work on unvented cylinders.

How often does an unvented cylinder need servicing?

Annually. This includes checking all safety devices and the expansion vessel.

What brands do you install?

We install Megaflo, Albion, Range Cylinders and other leading brands.

Can any property have an unvented cylinder?

Most can, but we carry out a survey to confirm mains pressure and flow rate are adequate.