It is the ultimate in thermal insulation and should be specified for any situation where excessive heat loss is a concern. Pilkington Optitherm™ S1 Plus is an off-line coated, single stock product, offering superior thermal insulation performance with Ug-value of 1.0.

Pilkington Optitherm™ S1 Plus Pilkington Optitherm™ S1 Plus is an off-line coated, single stock product, offering superior thermal insulation performance with Ug-value of 1.0.

By replacing single glazed window glass with thermally insulated windows containing Pilkington energiKare ™ double glazing units, the amount of energy lost can be reduced by up to 75% and heating bills lowered by up to 20% each year.

When fitted with Pilkington Activ™ combined with a thermally efficient glass such as Pilkington Optitherm™ S1 Plus, your transformed conservatory will be warmer in the winter, cooler in the summer and will look cleaner than ordinary glass.

Benefits of installing energy rated windows: Choosing windows incorporating a low-e glass such as a glass from the Pilkington K Glass™ or Pilkington Optitherm™ ranges helps to prevent heat from escaping through the windows, reflecting it back into your home.

Specify your projects quickly and easily with Pilkington Spec-it! If you know the target U and g values for your project, then Spec-it! can help you select the right product.

We offer a range of low-e energy-efficient glazing to suit every type of property, from a modern home to an older traditional styled home.

Better insulation and no cold spots near windows make Pilkington K Glass™, Pilkington K Glass™ S and Pilkington Optitherm™ S1 Plus an excellent choice for conservatories, because thanks to a special low emissivity coating on the surface of the glass, it lets the sun's rays through, but reflects heat from fires and radiators back into your ...

It reduces the amount of heat lost through your windows and can also allow more heat energy from the sun in through the glass. This so-called passive solar gain provides additional energy free of charge.

Reduces solar heat gain and offers high levels of natural light to provide comfortable and pleasant environments in which to live and work. Improves the energy efficiency of domestic or commercial buildings whilst enabling the extensive use of glass and the benefit of passive solar gain.