Asymmetrical vacuum-insulated glazing unit

A vacuum insulating glazing unit provided with an infrared reflecting coating, having a length L, where 300 mm≤L≤4000 mm, and a width W, where 300 mm≤W≤1500 mm, comprising:

• a first glass pane having an inner pane face and an outer pane face, having a thickness Z1 and bearing the infrared reflective coating on the inner pane face, the first glass pane with the infrared reflective coating having an energetical absorptance EA1;
• a second glass pane having an inner pane face and an outer pane face, having a thickness, Z2, wherein the thicknesses Z1 and Z2 are measured in a direction normal to a plane, P, the second glass pane having an energetical absorptance EA2;
• a set of discrete spacers positioned between the first and second glass panes, maintaining a distance between the first and the second glass panes and forming an array having a pitch λ, wherein 10 mm≤λ≤35 mm;
• a hermetically bonding seal sealing the distance between the first and second glass panes over a perimeter thereof;
• an internal volume, V, defined by the first and second glass panes and the set of discrete spacers and closed by the hermetically bonding seal, wherein there is a vacuum of absolute pressure of less than 0.1 mbar;
• wherein the inner pane faces of the first and second glass panes face the internal volume, V;
• and
• wherein the first glass pane is thicker than the second glass pane (Z1>Z2), and ΔEA≤0.0033 ΔZ2/mm2−0.0468 ΔZ/mm+0.7702;
• wherein ΔEA=EA1−2EA2, Z1≥5 mm, Z2≥3 mm, and ΔZ=(Z1−Z2)≥1 mm.