Unvented hot water · G3 qualified

Mains-pressure hot water, installed and certified.

Unvented cylinder installation, servicing and repair across Hampshire. Every install signed off to G3 building regs and registered with the manufacturer.

Unvented cylinder installation

What we cover

Cylinder work, top to bottom, G3 certified.

Unvented cylinder installation

Megaflo, Telford, Joule, Heatrae — installed, certified and registered with the manufacturer.

Annual servicing

Expansion vessel re-pressurised, valves tested, temperature settings verified, certificate emailed.

Replacement & upgrades

Like-for-like replacement or upgrade to a higher-spec cylinder. Old unit removed and recycled.

Repairs

Pressure issues, weeping valves, immersion failures, expansion vessel replacement.

Vented-to-unvented conversion

Where mains pressure allows, full conversion to mains-pressure hot water throughout the house.

Building-control sign-off

G3 certification supplied for any new install or major work. Filed with building control where required.

G3 certified unvented cylinder install

The qualification

G3 is non-negotiable. Every engineer holds one.

Unvented cylinders are pressure vessels. We will not let an unqualified engineer near one. Our G3 certificates are current, the work is signed off to building regs, and we hold the public liability cover to back it.

G3

Current certification

£5M

Public liability

2 yrs

Workmanship guarantee

The installation

Survey, spec, fit, certify.

We tell you the price before we start. No call-out fee, no charge for finding the right washer.

1

On-site survey

We test mains pressure, flow rate and the existing pipework. We measure the airing cupboard.

2

Specified quote

Specific cylinder model, capacity, valves and controls — quoted in writing. No vague "starting from" pricing.

3

Install or service

Tidy installation, all valves correctly oriented, condensate disposed of properly, system commissioned.

4

Sign-off & paperwork

G3 certificate, manufacturer registration and service log. All emailed the same day.

Recent unvented work

Mains-pressure hot water, done properly.

Megaflo upgrade from a vented system. Pressure across the whole house is night and day. Tidy install.

F. MarkhamBursledon

Annual service, no fuss, certificate emailed the same afternoon.

P. SayerRomsey

Replaced a failed expansion vessel — diagnosed in ten minutes, replaced in an hour. Saved a full cylinder replacement.

A. HolmanEastleigh

Recent cylinder work

Unvented systems we’ve serviced and installed.

Megaflo cylinder install, Chandlers Ford
PRV and expansion vessel
G3 commissioning paperwork
New cylinder pipework and isolation

FAQs

Common unvented questions.

Can't see your answer? Call 07708 089515.

G3 is the unvented hot water building-regs qualification required for installing, servicing or maintaining unvented cylinders in the UK. All our heating engineers hold a current G3 certificate.

Cylinder install or service?

Request a free home survey.

Aqualogic engineer en route