1 What is Pilkington energikare™ ?

It is an insulating glass unit (IGU) designed specifically for use in highly energy efficient windows and incorporates specific glass products from the Pilkington range manufactured to EN1279-3.  

Pilkington energiKare™ can be used in windows of any frame material and further assessed to achieve a Window Energy Rating of band C as a minimum or U-value 1.6 as a maximum hence meeting current Building Regulations regarding energy efficiency. 

The IGU comprises one of our low-e glass products from the Pilkington K Glass™ range in the back pane and a front pane of Pilkington Optiwhite™ which lets in more of the sun's heat than ordinary glass which means that homeowners can benefit from free heat from the sun (so called passive solar gain). The glazing also includes argon gas filling and/or a special warm edge spacer bar to provide extra heat insulation and achieve the highest possible energy efficiency. 

Since its launch in 2007, hundreds of IGU manufacturers and window companies around the country have joined our Pilkington energiKare™ scheme offering our range of products and they listed on our supplier finder which is searched by thousands of homeowners every month. Since that time we have introduced a number of new low-emissivity glass products in both the Pilkington K Glass™ range and our Pilkington Optitherm™ range and all of these now qualify for use in Pilkington energiKare™. Qualification is achieved through enabling windows to meet the Building Regulations concerning energy efficiency being either a minimum WER band C or a maximum U-value of 1.6.

2 Which products can and can’t be used in Pilkington energiKare™ IGUs?

There are rules on which products can be used in order to meet the requirements are as follows:

  • For the low-emissivity glass, any product from either our Pilkington K Glass™ or our Pilkington Optitherm™ ranges, either hard or soft coat, may be used as long as the total enables a window to meet the current Building Regulations for energy efficiency; Window Energy Rating band C minimum or 1.6 U-value maximum. 
  • Either argon gas filling and / or warm edge spacer bar can be used to demonstrate manufacture to EN 1279-3 or EN1279-2 respectively as long as, once used in conjunction with an appropriate frame the total window exceeds Window Energy Rating band C or 1.6 U-value maximum.

3 Why should I be interested in Pilkington energiKare™?

There has been widespread news coverage about the escalating costs of energy for the home as well as concern about global warming so saving energy makes sense. Therefore, when discussing replacement windows with your customers emphasising these benefits using the backing of the Pilkington brand to sell energy efficient windows is a significant lift to your offering; customers can save money on fuel bills and do their bit for the environment using products from a brand they know and trust.

4 What about Pilkington Texture Glass and Pilkington energiKare™ for bathroom windows and other areas where privacy is required?

Patterned glass is excluded from consideration under Window Energy Rating schemes as are other decorative effects such as Georgian bars and leaded lights. Patterned glass IGUs as part of a Pilkington energiKare™ installation should be Argon filled (to match the window U-value specification of the remainder of the installation) and can then labelled as Pilkington energiKare™.

5 Do you provide any help in the process of gaining a WER using Pilkington energiKare™?

Yes. We can provide documentation, simulations for common window systems and help and advice using our WER DIY data through your representative or via our customer contact centre.

6 Is Pilkington energiKare™ applicable to the whole market for windows?

The brand relates to sectors and regions of the UK & Irish markets for use in DOMESTIC windows. Windows for new homes and particularly home improvements are highly relevant. However public and commercial windows may require solar control so the brand is not suitable for these applications.

7 Just how much will the average home energy bill be reduced through the installation of Pilkington Pilkington energiKare™?

Windows containing Pilkington energiKare™ can reduce home heating bills by over 20% when compared with existing glazing. Please see our energy savings calculator which can be used by homeowners to calculate their own savings.

A, B and C rated windows are all much more energy efficient than standard windows. That said, there are differences in performance of energy efficient windows with A B and C ratings;

Changing existing single-glazed, timber windows to Band C windows in a semi detached, gas fuelled house would be expected to save £4350 in heating costs and 11 tonnes CO2 over the life of the windows. 

If the new windows are instead B-rated then the savings increase to £4650 and 11.5 tonnes CO2. And, if the new windows are instead A-rated then the savings increase to nearly £5000 and over 12 tonnes CO2.

The above shows that achievement of the level C displays significant savings over existing windows with higher ratings of B and A delivering further smaller incremental savings above C.

8 What lifetime of window have you assumed in energy and cost saving calculations?

20 years which is consistent with the approach taken by the GGF.

9 What is the likely application and timing for usage of Pilkington energiKare™ Triple?

We expect that triple glazing requirements will increase over the next few years as the Government tightens the legislation concerning the conservation of fuel and power in new homes. The timetable set out for achieving zero carbon homes indicated that this would be by 2016 so housebuilders will be looking for the means to achieve this. Triple glazing will enable them to keep the large glazed areas that homeowners like as well as benefiting from increased passive solar gain and thermal insulation.

10 Is Pilkington energiKare™ appropriate for all applications?

When you use Pilkington Optiwhite™ in the front pane of an IGU it increases light transmission by 2% and solar gain by 6%. So Pilkington energiKare™ is entirely appropriate in domestic windows, doors / patio doors, roof-lights, conservatory verticals and replacement units, and beneficial in most areas except those sensitive to overheating. Where overheating is a possibility then tinted or solar control products should be used. Such products include; Pilkington Optifloat™ Tint, Pilkington Activ™ Blue or Bronze, Pilkington Activ™ Pilkington SunShade™ Neutral or Blue, Pilkington Suncool™ or Pilkington Activ Suncool™ ranges.

11 Is Pilkington energiKare™ applicable to aluminium and timber framed as well as PVC framed windows?

Yes.  The performance may differ for the various types and designs of frame as well as frame materials. The minimum performance requirement is that the complete window achieves WER band C or has a maximum U-value of 1.6.

12 Is Pilkington energiKare™ suitable for use in conservatories?

It is ideal for North-facing conservatories which could be glazed with Pilkington energiKare™ for additional warmth. However, for South-facing conservatories and roof-glazing applications we would recommend the use of solar control products such as Pilkington Activ™ Blue or Bronze and Pilkington Activ SunShade™ Neutral or Blue.


What would be the saving in heat loss for a North facing window?

Calculations are based on average so North would be slightly worse and South facing would be slightly better.


Is Pilkington energiKare™ suitable for commercial buildings?

Only those commercial building which are domestic in nature such as blocks of apartments, student accommodation, homes for the elderly and so on.


Pilkington energiKare™ suitable for public buildings such as schools?

No, schools are not generally domestic in nature. Given the high levels of day time occupancy and often sizeable glazed areas, it may be more appropriate to utilise some solar control glazing instead of Pilkington energiKare™ in schools.