A coated article including a coating supported by a glass substrate, the coating comprising moving away from the glass substrate: a dielectric layer comprising zirconium silicon oxynitride; a first layer comprising zinc stannate; a first layer comprising zinc oxide located over and directly contacting the layer comprising zinc stannate; a first infrared reflecting layer comprising silver located on the substrate over and directly contacting the first layer comprising zinc oxide; and a contact layer comprising metal oxide located over and directly contacting the first IR reflecting layer comprising silver; a second layer comprising zinc stannate on the glass substrate over at least the first IR reflecting layer and the contact layer; a second layer comprising zinc oxide located over at least the second layer comprising zinc stannate; a second IR reflecting layer comprising silver located over at least the first IR reflecting layer, the first and second layers comprising zinc stannate (5, 12), and the first and second layers comprising zinc oxide (7, 17); another dielectric layer (22, 23) over at least the second IR reflecting layer comprising silver; wherein the coating contains two silver based IR reflecting layers (9, 19); wherein the second IR reflecting layer comprising silver is at least 1,0 nm (10 angstroms) thicker than the first IR reflecting layer comprising silver; wherein the dielectric layer comprising zirconium silicon oxynitride is at least 1,0 nm (10 angstroms) thicker than the first layer comprising zinc stannate; and wherein the second layer comprising zinc stannate is at least 2,0 nm (20 angstroms) thicker than the dielectric layer comprising zirconium silicon oxynitride. a dielectric layer comprising zirconium silicon oxynitride; a first layer comprising zinc stannate; a first layer comprising zinc oxide located over and directly contacting the layer comprising zinc stannate; a first infrared reflecting layer comprising silver located on the substrate over and directly contacting the first layer comprising zinc oxide; and a contact layer comprising metal oxide located over and directly contacting the first IR reflecting layer comprising silver; a second layer comprising zinc stannate on the glass substrate over at least the first IR reflecting layer and the contact layer; a second layer comprising zinc oxide located over at least the second layer comprising zinc stannate; a second IR reflecting layer comprising silver located over at least the first IR reflecting layer, the first and second layers comprising zinc stannate (5, 12), and the first and second layers comprising zinc oxide (7, 17); another dielectric layer (22, 23) over at least the second IR reflecting layer comprising silver; wherein the coating contains two silver based IR reflecting layers (9, 19); wherein the second IR reflecting layer comprising silver is at least 1,0 nm (10 angstroms) thicker than the first IR reflecting layer comprising silver; wherein the dielectric layer comprising zirconium silicon oxynitride is at least 1,0 nm (10 angstroms) thicker than the first layer comprising zinc stannate; and wherein the second layer comprising zinc stannate is at least 2,0 nm (20 angstroms) thicker than the dielectric layer comprising zirconium silicon oxynitride.