What is an unvented cylinder?
An unvented hot water cylinder is a sealed, pressurised system connected directly to the mains water supply — delivering hot water at mains pressure throughout your home. No cold water tank needed in the loft.
⚠️ G3 qualified engineers only
Unvented hot water cylinders must by law only be installed, commissioned, serviced and repaired by engineers holding a G3 qualification. Andy holds this qualification — always verify your engineer is G3 qualified.
Services include
- Full unvented cylinder installation and commissioning
- Annual servicing — a legal requirement
- Fault diagnosis and repair
- Pressure relief valve and expansion vessel checks
- Building Regulations Part G3 notification submitted
Brands Andy works with
- Megaflo (Heatrae Sadia)
- Gledhill
- Telford
- Joule
- Vaillant uniSTOR
- Worcester Bosch Greenstore
- All other major makes
