U-Values for uPVC Tilt and Slide Patio Doors

The u-value, also known as the heat transfer co-efficient is a measure of the amount of heat lost through the product over a given time period. The lower the value, the more insulating and energy-efficient the product. The u-values given below (U_w for the window, U_g for the glass, and U_f for the frame) refer to those of a test window with a single sash, 1,230 mm in width and 1,480 mm in height. The same profiles are used in our windows and French doors as in tilt and slide patio doors. As tilt and slide doors are larger than windows, their exact u-values will differ depending on the dimension.

U-Values for the IDEAL 4000 Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate 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 IDEAL 4000 profiles according to EN ISO 10077-1, see comments 1) 2) 3)

IDEAL 4000 - profile section

U-Values for the IDEAL 5000 Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate W/(m²k)
1.1	1.2	1.3 (1.29)	1.2 (1.23)	1.2 (1.21)
1.0	1.2	1.2 (1.23)	1.2 (1.17)	1.1 (1.14)
0.7	1.2	1.0 (1.02)	1.0 (0.969)	0.9 (0.94)
0.6	1.2	0.9 (0.95)	0.9 (0.89)	0.9 (0.87)

Table of Uw values for IDEAL 5000 profiles according to EN ISO 10077-1, see comments 1) 2) 3)

IDEAL 5000 - profile section

U-Values for the IDEAL 7000 Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate W/(m²k)
1.1	1.1	1.3 (1.26)	1.2	1.2 (1.18)
1.0	1.1	1.2 (1.19)	1.1 (1.13)	1.1 (1.11)
0.7	1.1	1.0 (0.99)	0.9 (0.92)	0.9
0.6	1.1	0.9 (0.92)	0.9 (0.86)	0.8 (0.84)

Table of Uw values for IDEAL 7000 profiles according to EN ISO 10077-1, see comments 1) 2) 3)

IDEAL 7000 - profile section

U-Values for the IDEAL 8000 Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate W/(m²k)
1.1	1.0	1.2 (1.23)	1.2 (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 IDEAL 8000 profiles according to EN ISO 10077-1, see comments 1) 2) 3)

IDEAL 8000 - profile section

U-Values for the energeto 8000 Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate W/(m²k)
1.0	0.98	1.2	1.1	1.1
0.7	0.95	0,98	0.87	0.85
0.6	0.95	0.91	0.81	0.79
0.5	0.95	0.84	0.74	0.72

Table of Uw values for energeto 8000 profiles according to EN ISO 10077-1, see comments 1) 2) 3)

energeto 8000 - profile section

U-Values for the energeto 8000 ED Profile

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal KSD W/(m²k)	Window U_w value insulating glass edge seal Swisspacer Ultimate W/(m²k)
1.0	0.81	1.1	1.0	1.0
0.7	0.79	0.93	0.82	0.80
0.6	0.79	0.86	0.75	0.74
0.5	0.79	0.79	0.69	0.67

Table of Uw values for energeto 8000 ED profiles according to EN ISO 10077-1, see comments 1) 2) 3)

energeto 8000 ED - profile section

Windows with a glazing heat transfer coefficient of U_g 1.9 W/m²K are be specified using the standard dimensions of 1.23 m x 1.48 m.
According to EN ISO 10077, U_wvalues are shown with 2 decimal points.
The U_w values given in brackets are not rounded and are for information purposes only.

How Are the U-Values of an uPVC Tilt and Slide Patio Door Calculated?

With an uPVC tilt and slide door, the Uw-values are calculated using the individual u-values of the window frame (U_f) and glazing (U_g). For the sake of comparison, a standard window size of 1230 x 1480 mm is usually used for the calculation because the profile is the same as that used for the tilt and slide patio door. The patio door's exact u-values will differ depending on its dimension.

To improve the value and insulation, a thermally separated edge warm edge seal can be added to insulating glass.

The heat transfer coefficient of an uPVC tilt and slide patio door determines whether the product can be suitable for passive houses. Energy savings not only protect the environment, they can also make an immediate difference to energy bills.

The difference between a U_w-value of 3.5 W/(m²k) and 0.83 W/(m²k) can make a difference of more than 1000 litres of heating oil per year for an area of 30 m².

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