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Uw values for upvc-alu tilt and slide patio doors

The Uw values given below refer to the sample size. The sample size refers to a single-sash window with a width of 1230 mm and a height of 1480 mm. All Uw values from German manufacturers are determined using this window size. As the window gets smaller, the Uw value goes down accordingly. For larger windows, the Uw value generally improves. The specified Uw values also apply to parallel slide & tilt doors; since the dimensions of a parallel slide & tilt door are larger than those of the sample window size, better Uw values will be achieved.

Twinset 4000 Uw values

Glass Ug value W/(m²k) Frame Uf value W/(m²k) Uw value with aluminium insulating glass edge seal
W/(m²k)
Uw value with KSD insulating glass edge seal W/(m²k) Uw value
with Swisspacer Ultimate insulating glass edge seal
W/(m²k)
1.1 1.3 1.3 (1.33) 1.3 (1.26) 1.2 (1.24)
1.0 1.3 1.3 (1.26) 1.2 1.2 (1.18)
0.7 1.3 1.1 (1.05) 1.0 (0.99) 1.0 (0.97)
0.6 1.3 1.0 (0.98) 0.9 (0.92) 0.9 (0.90)
Table of Uw values for TwinSet 4000 profiles according to DIN EN ISO 10077-1, see comments 1) 2) 3)

TwinSet 4000 - Profile section

Twinset 8000 Uw values

Glass Ug value W/(m²k) Frame Uf value W/(m²k) Uw value with aluminium insulating glass edge seal
W/(m²k)
Uw value with KSD insulating glass edge seal W/(m²k) Uw value with Swisspacer Ultimate insulating glass edge seal
W/(m²k)
1.1 1.0 1.2 (1.23) 1.1 (1.17) 1.2 (1.15)
1.0 1.0 1.2 (1.16) 1.1 1.1 (1.08)
0.7 1.0 1.0 (0.95) 0.9 (0.89) 0.9 (0.87)
0.6 1.0 0.9 (0.89) 0.8 (0.82) 0.8
Table of Uw values for TwinSet 8000 profiles according to DIN EN ISO 10077-1, see comments 1) 2) 3)

TwinSet 8000 - profile section

  1. Windows with a heat transfer coefficient of Ug < 1.9 W/m²K for the glazing may always be specified with the standard dimensions of 1.23 m x 1.48 m.
  2. According to DIN EN ISO 10077, Uw values < 1.0 W/m²K are shown with 2 decimal points.
  3. The Uw values given in brackets are not rounded and are for information purposes only.

With a parallel slide & tilt door made of uPVC-aluminium, the Uw values are calculated based on the individual U values of each window frame and glazing as well as the heat loss along the edge of the glass. For the sake of comparison, a standard window size of 1230 x 1480 mm is usually used for the calculation, but it can generally be assumed that a larger window will result in a lower value.

A thermally separated edge seal along the insulating glass - the so-called "warm edge" - further improves the thermal insulation of the entire door.

The thermal heat coefficient of a parallel slide & tilt door made of uPVC-aluminium determine whether a parallel slide & tilt door can be classified as suitable for passive houses. Energy savings not only protect the environment, they also make an immediate difference on your energy bill.

The difference between a Uw value of 3.5 and a value of 0.83 can make a difference of more than 1000 litres of heating oil per year for an area of 30 m².


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