As of this Saturday 26 September, all newly installed heating and hot water systems, including combination and those sold as a package including renewable energy, will have to display an energy efficiency label rating each system from A+++ to G, where A+++ is the most energy efficient and G the least.
In addition to the new regulations in force as of this weekend, the launch of a new package label has been created amongst an alliance of trade bodies across Europe as part of the LabelPack A+ project. The online tool  will allow heating and hot water professionals to calculate and generate the labels for combination heating and water systems. The website also contains useful information for homeowners and businesses with training guides for installers, all designed to make the transition to the new energy efficiency labels as smooth as possible. There will also be guidance to help installers recommend the most appropriate solution to consumers, depending on their budget, wishes and needs.
The new package label calculating tool can be found here.
Ofgem has provided a document that explains the Ecodesign of Energy-related Products Directive (ErP) and The Energy Labelling Directive, and their impact on the Domestic RHI.
DECC have produced a similar document outlining the effects of the ErP on for heat pumps.