Energy Efficiency & ERP

In the European Union new ERP legislation (Energy Reducing Products) has been passed to reduce energy use over time. More information can be found here

Increasingly products in the EU will have to display energy levels showing the energy efficiency of the product. As far as comfort cooling air conditioning systems are concerned this affects systems up to 12KW which now have to display an energy label to clearly allow consumers to compare performance between systems.

All systems covered by the Energy Labels have to display their seasonal efficiency as well as an energy rating. Minimal seasonal efficiency levels also apply so that in 2015 G rated systems will no longer be able to be imported into the UK and from 2017 these will be joined by F rated systems and from 2019 E rated.

Cooling performance is given by a SEER (Seasonal Energy Efficiency Ratio) which is the annual cooling demand divided by the annual consumption due to cooling. The higher the figure the better performing the system with a minimum of 2.6 for an F rating and the maximum A+++ rating being 8.5 and above.

Heating performance is given by a SCOP (Seasonal Co-Efficient Of Performance) which is the annual heating demand divided by the annual consumption due to heating. The higher the figure the better performing the system with a minimum of 1.9 for an F rating and the maximum A+++ rating being 5.1 and above.

Example Energy Label

Explanation of energy ratings relating to SEER & SCOP

Comparing running costs?

Part of the energy label is an estimated annual running cost to allow you to compare various systems. Based upon a capacity of 3.5KW a table comparing Panasonics systems can be produced as follows.

 System TypeModel  SEER / SCOP List Price Annual KWh Annual Cost * KW Cool / Heat **
 Heatcharge CS-VE12NKE A+++ / A+++ £3,500 1,298 £155.76 3.5 / 4.2 KW
 Etherea CS-E12QKE A++ / A++ £861 1,094 £131.28 3.5 / 3.2 KW
 Standard CS-RE12RKE A++ / A+ £714 1,181 £141.72 3.5 / 2.8 KW
 Budget CS-UE12RKE A+ / A £648 1,103 £132.36 3.5 / 2.4 KW

* Annual cost based upon an electrical cost of 12p per KWh

** Output of the system for design purposes. In heating this is based upon an outdoor temperature of -10C.

Please note that the more expensive systems give more heating in low temperature conditions so can have higher theoretical annual running costs. For instance in the example above a budget CS-UE12RKE system has the same running cost as a premium Etherea system but the budget unit only provides 2.4KW of heating at -10C while the more expensive system provides 3.2KW. To get this level of performance from a budget system would require the next size unit up.