CET uses the most thermally-efficient glass available to reduce heat loss, maximise energy efficiency and improve comfort levels. Our Thermal Insulation glass has very high light transmission and can dramatically reduce fuel bills. For customers requiring higher levels of performance, we can also offer super soft-coat or triple glazed units.
There are several factors that affect the efficiency of thermal insulation:
Low E Glass
Thermal insulation glass coatings are generally referred as Low Emissivity glass or Low E glass. Using Low E glass on the inside of a sealed glazed unit allows customers to retain more of the heat generated in their home and gain free heat from the sun’s rays.
Window Energy Rating (WER)
WER is the measurement used in the UK to define thermal efficiency of fenestration (windows and doors). This measurement combines the heat retaining qualities (U value) and heat gaining properties (G value) of the complete window to give a value – ‘A’ rating being the best and ‘C’ rating the lowest acceptable.
Soft-coat Low E glass is today’s preferred option for most customers, marrying a U value of 1.2 with a good G value, allowing customers to achieve a WER of ‘A’ in the vast majority of window systems when combined with warm edge technology, low iron glass and gas filling.
CET’s sealed units come with argon gas to further reduce the loss of heat. Online gas filling ensures the consistent application of the correct amount of gas in CET’s units.
Low iron glass
Low iron glass enhances solar gain (G value) and the WER value, ultimately increasing thermal intake from the sun’s rays. The lower iron content produces a whiter appearance, allowing rooms to benefit from as much natural light and heat as possible.
Warm edge spacers
We supply warm edge spacers to help reduce cold bridge, which virtually eliminates peripheral condensation around the glass and also helps to increase the overall U value of the window, thus improving its WER value.
Working with the major glass manufacturers, CET can also offer Super soft-coat Low E glass which offers another 17% improvement in U value down to 1.0. This product is ideal for new build and commercial projects where WER values are not required.
Triple glazing opens up a whole new world of opportunities to window installers and glass companies because there are three panes of glass and six surfaces on which we can use the different technologies. When manufacturing triple glazed units, CET will always use a thermally toughened glass as the centre pane to eliminate any risk of thermal fracture which can occur on a partially shaded window in extreme conditions.
The rest of the specification of the unit depends on what you need to achieve. Our top specification is two panes of soft-coat Low E glass and one pane of Low Iron glass with two warm edge spacers and both cavities gas filled (typically giving a 0.8 U value). However, there are other options, such as adding a self-cleaning glass with solar control values for south-facing aspects.
Specifically designed for the conservatory market, this product combines a U value of 1.0 with high Solar values and give customers all year round comfort.
CET also offers a range of specific commercial glasses with good U Values designed to give the best Thermal and Solar values available.