Thermal Insulation



Did you know that over 25% of the heat in your house escapes through your windows? 

With increasing environmental awareness as well as the rising costs of energy, more emphasis is now being placed on ways to save energy in all types of domestic, commercial and public buildings.   Government regulations specifying minimum requirements for the energy efficiency of new homes are being gradually tightened to achieve zero carbon by 2016.  At the same time, it is important to improve the existing housing stock so requirements for refurbishments such as replacement windows are also being tightened.

Energy-efficient glass can play an important role in achieving these targets for thermal insulation of homes. 

By replacing your existing single glazed window glass with Pilkington energiKare™ thermally insulated windows, you could reduce the amount of energy lost through your windows by up to 75% and lower your heating bills by up to 20% each year.  Significant savings can also be achieved by upgrading double glazed windows which were installed before regulations were significantly tightened in 2002.

The advantages don’t stop there.  Not only are you saving money on your heating bills, you also have the reassurance that you are doing your bit to help the environment and reduce your carbon footprint.


Features and Benefits

Within the UK, there are a number of products available at present which are designed to improve the thermal insulation of your home, including thermal glass such as Planitherm.  However, without doubt the most well-known energy-efficient glazing product is Pilkington K Glass™.  This unique energy-efficient glass is the UK’s best-selling low-emissivity glass and is used in combination with Pilkington Optiwhite™ to make up the Pilkington energiKare™ double glazing units.  Each type of glass conveys unique energy-saving properties to the thermally insulated glass unit.

  • Pilkington K Glass™ makes up the inner pane of the double glazing unit and its primary function is to prevent heat escaping through your windows and return the heat back into your home.
  • Pilkington Optiwhite™ makes up the outer pane of the glazing unit and has special “extra clear” properties, which allow more light and heat from the sun to enter into your house through your windows.

By using a combination of these two types of thermally insulated glass, Pilkington have produced highly efficient thermal glass units which can be used in any type of window frame of buildings of any age.  Find your nearest Pilkington energiKare™ installer here.

Thermal Insulation and A-Rated Windows

Heat loss is normally measured by the thermal transmittance or U value, usually expressed in W/m2K and, in its most basic terms, the lower the U value, the greater the thermal insulation.  However, the amount of free heat energy from the sun, the solar gain or g-value can also have a big impact. Window Energy Ratings, which take account of solar gain, were introduced by the British Fenestration Rating Council (BFRC) in 2006 and they can provide a good indicator of how energy-efficient windows for homes can be.  The Window Energy Ratings Scheme is based on a scale of A through to G, with A-rated windows being the most energy-efficient.  Thermally insulated glass units or double glazed units incorporate low-emissivity glass such as Pilkington K Glass™ and can significantly improve the overall thermal performance of a window. Therefore the thermal insulation value is just one aspect of how much energy can be saved.

Products in this Category:

Pilkington energiKare
Insulating Glass Units (IGUs) work in two ways - they reduce the amount of heat lost through your windows and allow heat (energy) from the sun in through the window. Windows containing this type of energy-efficient glazing are available from retailers countrywide.

Pilkington energiKare Single/Spacia
Using Pilkington Spacia™ technology, this is a special ultra-thin vacuum Insulating Glass Unit which can be used in homes or buildings to replace existing single glazed windows.

Pilkington energiKare Triple
With three panes of glass, this is a range of extremely high performance Insulating Glass Units which dramatically reduce the amount of heat lost as well as allowing more heat (energy) from the sun through the window.

Pilkington energiKare Advantage
For applications requiring an optimised Ug value we introduce a new concept for the ultimate in thermal efficiency.

Pilkington Insulight Therm
This is our own range of Insulating Glass Units (IGUs) made to European Standards in our own network of branches countrywide.

Pilkington K Glass
Our market leading low-emissivity glass may be incorporated into Insulating Glass Units, providing a comfortable environment for occupants keeping buildings warm and benefitting from free heat energy from the sun known as solar gain.

Pilkington K Glass S
A high performance, low-emissivity soft coated product which offers excellent thermal insulation when incorporated within an Insulating Glass Unit (IGU).

Pilkington K Glass OW
Our market leading low-emissivity glass may be incorporated into Insulating Glass Units, providing a comfortable environment for occupants with improved solar gain over the standard product.

Pilkington K Glass OW on Surface 4

Pilkington Optifloat
Highest quality float glass with an unrivalled environmental pedigree.

Pilkington Optitherm Range
High to very high thermal insulation performance.

Pilkington Spacia
A special vacuum glazing unit which can be used in homes or buildings to replace existing single glazed windows. It provides similar energy efficiency performance as a standard unit, but in a much thinner profile, so it can be used in slim frames - perfect for maintaining a property's original appearance.