Had a few minutes to have a google this pm and found this on ideal....
Martin Watson
July 9, 2015 at 3:27 pm
In the statement in the erp directive it mentions about calculating the system efficiency. As an installer who is commissioning the appliance, what is the process to follow to calculate this figure to add to the completed paperwork
Hi Martin,
There are a few points to remember with regard to labelling, systems and calculations. If you are supplying a complete heating system, you will be responsible for creating and providing homeowners with the energy efficiency package label and fiche.
A ‘package label’ must be produced when selected components are installed together, however, you will not need to supply a ‘package’ label if you are only installing a boiler or a boiler plus hot water cylinder, as these are not defined as ‘packages’ or ‘systems’ under the directive.
Whether an installation requires a ‘system’ calculation simply depends on whether it meets one of two definitions of a package as given by the directive:
1 A space heater plus a temperature control device and/or a solar device, OR
2 A water heater and a solar device
(Please note that conventional cylinders are not included, neither are radiators or pumps. Pumps are individually rated.)
As manufacturers will have to supply the energy efficiency figures for their products, calculating the whole system efficiency will be as simple as adding together the different percentages of the components used in the system to generate an overall figure. You can find the information in the product fiches supplied by manufacturers in the installation manuals. The total will then translate into ratings familiar to consumers from their TVs and household goods energy labels.
Controls will not carry an ErP label but play an important part in the calculation and rating of a package. Controls are classified into eight groups, each of which is allocated a percentage score.
For example, an Ideal Vogue 26kW combi boiler has an energy efficiency figure of 93%, if installed with Class 8 controls an additional 5% can be added, to give a total of 98% which translates into an A+ rated system.
We are currently developing a dedicated web page for installers to calculate and generate package labels – watch this space for more information!