Unvented cylinders and G3 building regulations
Worcester’s Greenstore combination heat pumps, Greenstore cylinders and Greensource air to water distribution units are fully approved and meet the legal requirements of G3 regulations.
The G3 regulations have been devised as the method to ensure that products which store in excess of 15 litres of hot water are equipped with safety devices capable of preventing the water from exceeding 100°C.
In the past it has been permitted for the installer to fit the various safety devices at the point of installation and have the installation checked by building control. This has now been restricted to exclude the temperature and pressure relief valve which must be factory fitted.
It is no longer possible to comply with the regulations using a kit of parts and a Building Control inspection.
Unvented storage products over 15 litres must include the factory fitted temperature and pressure relief valve to be legally installed.