— Our Services
Unvented Cylinder Installations
— About This Service
Professional Unvented Cylinder Installations Across South Wales
Using Megaflo‑accredited unvented cylinders, Baxi‑compatible safety components and Uponor pipework where required, Green Flame’s Gas Safe and OFTEC registered engineers fit mains‑pressure hot water systems built to manufacturer guidance and current Building Regulations. Installations include expansion vessels, pressure‑relief arrangements and thermostatic controls, all commissioned and tested on completion. Free quotes and our instant estimate tool make planning straightforward across Porth, Bridgend and Cardiff.
— Our Process
How It Works
Survey & recommendation
A qualified engineer inspects pipework, boiler compatibility and hot water demands, then recommends Megaflo or equivalent models and a compliant safety layout.
Professional installation
We fit the cylinder, expansion vessel, pressure relief and controls using manufacturer‑approved parts and follow Megaflo/Worcester guidance throughout.
Commissioning & handover
System is pressure‑tested, thermostats set, safety devices checked and you receive a full handover, certification and maintenance advice.
— Benefits
Why Choose us for Unvented Cylinder Installations?
Manufacturer‑approved kit
Megaflo‑accredited cylinders, Baxi‑compatible valves and recognised brands ensure reliable performance and straightforward servicing.
Safe, compliant work
Gas Safe & OFTEC registered engineers fit required safety devices and test to Building Regulations so installations pass inspection and operate safely.
Local, transparent service
Based in Porth with rapid coverage across South Wales, Green Flame offers clear quotes, an instant estimate tool and friendly aftercare.
What we install — unvented (Megaflo‑style) hot water cylinders that draw directly from the mains to deliver full mains pressure to multiple bathrooms, showers and kitchen outlets. Installations include an expansion vessel, pressure relief arrangements, high‑limit thermostats and isolation valves. We use Megaflo‑accredited cylinders and manufacturer‑approved components to reduce callbacks and make future servicing straightforward.
Why choose Green Flame? Our engineers are Gas Safe and OFTEC registered, plus accredited by Megaflo and Baxi. That means the installation is carried out by technicians who understand boiler‑to‑cylinder interaction, minimising compatibility issues and ensuring safe operation. For a no‑obligation survey or quick estimate, call 07971 651 849 or email info@greenflameplumbingandheating.co.uk. We cover Porth, Bridgend, Pontyclun, Cardiff and the surrounding Valleys.
— FAQ
Frequently Asked Questions
An unvented cylinder takes water directly from the mains to provide mains‑pressure hot water at every outlet. Unlike a traditional vented system with a cold tank in the loft, an unvented setup needs safety devices such as pressure relief valves and an expansion vessel, but it delivers stronger flow and copes better with multiple simultaneous showers or baths.
— Related Services
Other Services We Offer
Upgrade to mains‑pressure hot water
— Other Services