NSAI Agrément has introduced an independent
Window Energy Performance (WEP) Certification scheme for the Irish consumer market.
The WEP rating is provided for a standard window to represent typical window sizes. This enables a comparison between different products. Each WEP rating label is specific to a unique window frame and glazing assembly from a single manufacturer. This WEP label is non-transferable and both the window assembly name
(1) and the manufacturer
(2) will appear on the WEP Certificate. The
WEP Certificate Energy Index (3) combines the following characteristics to allow consumers to determine how well each window assembly will perform.
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ENERGY PERFORMANCE CRITERIA
THE THERMAL TRANSMITTANCE (4) (Uwindow or Uw) is a measure of the insulation properties of the window assembly and allows the consumer to compare how effective each window assembly is at containing and conserving heat within a building in the winter. The lower the U-value of the window assembly, the greater the thermal performance of the window. The published U-value combines the thermal transmittance for both the glazing and the window frame.
THE SOLAR FACTOR (5) (gwindow) or Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight. Heat gain can be beneficial in winter months but can also present consumers with additional cooling loads in summer months. The Solar Factor is expressed as a number between 0 and 1. A lower Solar Factor means less heat gain.
THE AIR LEAKAGE (6) (Lfactor) is a measure of the air tightness of a specific window assembly. The weakest point in any window arrangement will tend to be around the seals on an opening section of window. To qualify for the NSAI WEP Scheme, manufacturers must first demonstrate that their window arrangements achieve a Class 4 air tightness rating when tested at 600Pa to I.S. EN 12207:1999
Windows and doors - Air permeability - Classification. As a result well-made windows should have little or no air leakage. The lower the air leakage value of the window assembly, the greater the overall efficiency of the window assembly.
ADDITIONAL INFORMATION
(7) The certificate identifies if the window assembly has a double or triple glazed unit.
(8) The thermal transmittance of the glazing unit (U
g) is published on the certificate.
(9) The material from which the window assembly is manufactured is identified on the certificate i.e. uPVC, Timber or Aluminium.
(10) The Solar Energy Transmittance (
g┴) is measured perpendicular to the glazing units. The solar energy transmittance (
g┴) is then converted to the Solar Factor
(5) (g
window) in order to make allowances for overshading and inclination of the sun.
The Rating Index for each window assembly is derived by combining Uwindow, gwindow and the Lfactor. The WEP Rating Band is based on the Rating Index.
For example:-
- An A1 rated window has a rating index greater than +20 kWh/m²/year.
- An A3 rated window has a rating index in the range of 0 to +10 kWh/m²/year.
- A C rated window has a rating index in the range of -30 to -20 kWh/m2/year.
A positive (+) WEP rating represents a better energy performing window.
For detailed information download: NSAI Window Energy Peformance (WEP) Scheme Booklet.
Click on window type links below to view energy rating label of each certified window.
WEP
Certificate Number |
Manufacturer
[website listed] |
Window Type |
Description |
WEP
Rating Band |
WEP
Rating New |
Rating Index |
| IAB/W001/005 |
TJ Grady Ltd |
Elegance ZE2-SV |
PVC U |
A |
A3 |
-0.24 |
| IAB/W001/006 |
TJ Grady Ltd |
Elegance SE2-SV Diamond |
PVC U |
A |
A3 |
6.32 |
| IAB/W001/007 |
TJ Grady Ltd |
Elegance ZE3-SV |
PVC U |
A |
A2 |
16.78 |
| IAB/W001/008 |
TJ Grady Ltd |
Elegance ZE3-SV Diamond |
PVC U |
A |
A1 |
23.34 |
| IAB/W001/009 |
TJ Grady Ltd |
Elegance ZE2 Plus |
PVC U |
|
A3 |
4.95 |
| IAB/W001/010 |
TJ Grady Ltd |
Elegance ZE2D Plus |
PVC U |
|
A3 |
9.32 |
| IAB/W001/011 |
TJ Grady Ltd |
Elegance ZE3 Plus |
PVC U |
|
A2 |
18.29 |
| IAB/W001/012 |
TJ Grady Ltd |
Elegance ZE3D Plus |
PVC U |
|
A1 |
27.03 |
| IAB/W001/013 |
TJ Grady Ltd |
Futureframe 1.1 |
PVC U |
|
A3 |
9.22 |
| IAB/W001/014 |
TJ Grady Ltd |
Futureframe 0.9 |
PVC U |
|
A2 |
16.36 |
| IAB/W001/015 |
TJ Grady Ltd |
Futureframe 0.8 |
PVC U |
|
A2 |
19.79 |
| IAB/W001/016 |
TJ Grady Ltd |
High Performance 1.4 |
PVC U |
|
A3 |
0.28 |
| IAB/W002/004 |
Eden Aluminium |
Eden Slim Diamond |
PVC U |
A |
A3 |
4.79 |
| IAB/W002/005 |
Eden Aluminium |
Eden Classic Vista |
PVC U |
A |
A3 |
-0.40 |
| IAB/W002/006 |
Eden Aluminium |
Eden Classic Diamond |
PVC U |
A |
A3 |
0.28 |
| IAB/W003/001 |
Senator Windows |
Senergy Plus Window |
PVC U |
A |
A3 |
1.65 |
| IAB/W003/002 |
Senator Windows |
Senergy Premium Casement Window |
PVC U |
A |
A3 |
5.08 |
| IAB/W003/003 |
Senator Windows |
Senergy Elite Casement Window |
PVC U |
A |
A2 |
10.33 |
| IAB/W004/001 |
O'Grady uPVC Ltd |
Eco Elite A |
PVC U |
A |
A3 |
3.71 |
| IAB/W004/002 |
O'Grady uPVC Ltd |
Eco Elite B |
PVC U |
B |
B |
-6.27 |
| IAB/W004/003 |
O'Grady uPVC Ltd |
Eco-Elite Plus |
PVC U |
|
A3 |
0.15 |
| IAB/W004/004 |
O'Grady uPVC Ltd |
Eco-Elite Triple |
PVC U |
|
A3 |
5.53 |
| IAB/W005/001 |
Amber Windows |
Earthkind A |
PVC U |
A |
A3 |
3.71 |
| IAB/W005/002 |
Amber Windows |
Earthkind A-Rated |
PVC U |
A |
A3 |
-0.43 |
| IAB/W005/003 |
Amber Windows |
Earthkind Elite |
PVC U |
A |
A3 |
0.81 |
| IAB/W007/001 |
Grogan & Currid uPVC Ltd. |
Ecospec |
PVC U |
A |
A3 |
1.92 |
| IAB/W007/002 |
Grogan & Currid uPVC Ltd. |
Ecospec+ |
PVC U |
A |
A2 |
17.47 |
| IAB/W008/001 |
S. Doyle & Sons Ltd |
Energy Plus Int |
PVC U |
A |
A3 |
0.55 |
| IAB/W008/002 |
S. Doyle & Sons Ltd |
Energy Plus Ext |
PVC U |
A |
A3 |
-0.14 |
| IAB/W008/003 |
S. Doyle & Sons Ltd |
Energy C70 |
PVC U |
A |
A3 |
0.55 |
| IAB/W008/004 |
S. Doyle & Sons Ltd |
Ecotherm 70 |
PVC U |
A |
A3 |
0.28 |
| IAB/W008/005 |
S. Doyle & Sons Ltd |
Ecotherm 70 Passive |
PVC U |
A |
A1 |
25.53 |
| IAB/W008/006 |
S. Doyle & Sons Ltd |
V/S Supremacy |
PVC U |
A |
A3 |
3.29 |
| IAB/W008/007 |
S. Doyle & Sons Ltd |
Odyssey C70 28 |
PVC U |
|
A2 |
9.58 |
| IAB/W008/008 |
S. Doyle & Sons Ltd |
Odyssey C70 36 |
PVC U |
|
A1 |
19.76 |
| IAB/W008/009 |
S. Doyle & Sons Ltd |
Odyssey C70 44 |
PVC U |
|
A1 |
31.40 |
| IAB/W008/010 |
S. Doyle & Sons Ltd |
Energy Plus External |
PCV U |
|
A3 |
-0.27 |
| IAB/W008/011 |
S. Doyle & Sons Ltd |
Energy Plus Internal |
PVC U |
|
A3 |
-0.27 |
| IAB/W009/001 |
Maher Windows |
Maher ECO 7000 |
PVC U |
A |
A3 |
0.28 |
| IAB/W009/002 |
Maher Windows |
Maher ECO VS |
PVC U |
A |
A3 |
3.29 |
| IAB/W009/003 |
Maher Windows |
Maher Passive |
PVC U |
A |
A1 |
25.53 |
| IAB/W009/004 |
Maher Windows |
Maher ECO 7000 CG |
PVC U |
A |
A3 |
0.28 |
| IAB/W010/001 |
Global Home Improvements |
Heat Therm 30 A |
PVC U |
A |
A3 |
0.28 |
| IAB/W010/002 |
Global Home Improvements |
Heat Therm 30 Plus |
PVC U |
A |
A2 |
12.38 |
| IAB/W010/003 |
Global Home
Improvements |
Heat Therm 30 VS |
PVC U |
A |
A3 |
3.29 |
| IAB/W010/004 |
Global Home
Improvements |
Heat Therm 30 A 828 |
PVC U |
|
A3 |
9.45 |
| IAB/W010/005 |
Global Home Improvements |
Heat Therm 30 A 836 |
PVC U |
|
A2 |
18.25 |
| IAB/W011/001 |
Synergy UPVC |
Synergy A |
PVC U |
A3 |
A3 |
-0.40 |
| IAB/W012/001 |
Profile Systems |
Sheerframe 6000 |
PVC U |
A |
A3 |
0.28 |
| IAB/W012/002 |
Profile Systems |
Sheerframe 7000 |
PVC U |
A |
A3 |
0.28 |
| IAB/W012/003 |
Profile Systems |
Sheerframe 7000 0.8 |
PVC U |
A |
A1 |
25.53 |
| IAB/W012/004 |
Profile Systems |
Sheerframe Vertical Slider |
PVC U |
A |
A3 |
3.29 |
| IAB/W012/005 |
Profile Systems |
Sapa Dualframe 75mm Aluminuim |
Aluminium |
A |
A3 |
1.33 |
| IAB/W012/006 |
Profile Systems |
KBE Mark V |
PVC U |
A |
A3 |
1.10 |
| IAB/W012/007 |
Profile Systems |
KBE Mark V Externally Glazed |
PVC U |
A |
A3 |
-0.27 |
| IAB/W012/008 |
Profile Systems |
KBE Mark V Internally Glazed |
PVC U |
A |
A3 |
-0.27 |
| IAB/W012/009 |
Profile Systems |
C70 A3 1.40 |
PVC U |
|
A3 |
-0.40 |
| IAB/W012/010 |
Profile Systems |
C70 A2 1.0 |
PVC U |
|
A2 |
18.39 |
| IAB/W012/011 |
Profile Systems |
C70 A3 1.42 |
PVC U |
|
A3 |
0.42 |
| IAB/W013/001 |
Fox & O'Rourke Aluminium |
Fox & O'Rourke 'A' - Rated Window |
PVC U |
A |
A3 |
0.42 |
| IAB/W014/001 |
Kells Window Restoration Systems |
Kellwin Energy Plus |
Timber |
A |
A3 |
-0.14 |
| IAB/W014/002 |
Kells Window Restoration Systems |
Kellwin Heritage Eco |
Timber |
A |
A3 |
2.73 |
| IAB/W014/003 |
Kells Window Restoration Systems |
Matdec Elite |
Timber |
B |
B |
-4.12 |
| IAB/W014/004 |
Kells Window Restoration Systems |
Matdec Ultra |
Timber |
B |
B |
-3.43 |
| IAB/W015/001 |
Wright Window Systems |
Eco-Wright Gold |
PVC U |
A |
A3 |
-0.27 |
| IAB/W015/002 |
Wright Window Systems |
Eco-Wright Diamond II |
PVC U |
|
A3 |
0.42 |
| IAB/W015/003 |
Wright Window Systems |
Eco-Wright Platinum |
PVC U |
|
A2 |
12.91 |
| IAB/W015/004 |
Wright Window Systems |
Eco-Wright Platinum II |
PVC U |
|
A3 |
7.85 |
| IAB/W016/001 |
Dalgan Windows |
Dalgan Ultratherm 1 |
PVC U |
A |
A3 |
8.77 |
| IAB/W016/002 |
Dalgan Windows |
Dalgan Ultratherm 2 |
PVC U |
A |
A3 |
8.08 |
| IAB/W016/003 |
Dalgan Windows |
Dalgan Ultratherm 3 |
PVC U |
A |
A3 |
3.71 |
| IAB/W016/004 |
Dalgan Windows |
Dalgan Ultratherm 4 |
PVC U |
A |
A3 |
4.39 |
| IAB/W017/001 |
Moloney Window Systems |
Moloney Windows A- Rated |
PVC U |
A |
A3 |
-0.27 |
| IAB/W018/001 |
Campbell Windows /Doors / Conservatories |
Christy Campbell A-Rated |
PVC U |
A |
A3 |
-0.27 |
| IAB/W018/002 |
Campbell Windows /Doors / Conservatories |
Christy Campbell B-Rated |
PVC U |
B |
B |
-4.64 |
| IAB/W019/001 |
Forde Bros Ballinlough |
Forde Bros A-Rated Window |
PVC U |
A |
A3 |
-0.27 |
| IAB/W020/001 |
Michael Harrington uPVC Ltd |
Premium Energy |
PVC U |
A |
A3 |
0.15 |
| IAB/W021/001 |
Fingal Joinery |
Fingal Joinery A-Rated Aluminium |
Aluminium |
|
A3 |
2.31 |
| IAB/W022/001 |
Joseph O'Halloran & Sons Ltd |
S/F 70 Passive |
PVC U |
A |
A1 |
25.53 |
| IAB/W022/002 |
Joseph O'Halloran & Sons Ltd |
S/F 70 |
PVC U |
A |
A3 |
1.92 |
| IAB/W023/001 |
McMahon and Nagle Environmental Ltd |
EnviroSecure A14 |
PVC U |
|
A2 |
|
| IAB/W023/002 |
McMahon and Nagle Environmental Ltd |
EnviroSecure A5 |
PVC U |
|
A3 |
|
| IAB/W024/001 |
Larkin Aluminium Ltd |
Larkin 'A' Rated Window |
PVC U |
|
A3 |
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