A heater assembly for an aerosol-generating system, the heater assembly comprising: a heating element, the heating element comprising a mesh, the mesh comprising: a plurality of first filaments extending in a first direction, wherein the first filaments comprise a first material having a first electrical conductivity; a plurality of second filaments extending in a second direction, wherein the first direction is perpendicular to the second direction, and wherein the second filaments comprise a second material having a second electrical conductivity; and wherein the first electrical conductivity is greater than the second electrical conductivity; wherein each of the first filaments comprises a core and a coating overlying the core; wherein the coating comprises the first material, and wherein the core of each of the first filaments is formed from a material having a lower electrical conductivity than the first material; and at least two electrical terminals (13, 15) for supplying electrical power to the heating element; wherein each of the electrical terminals (13, 15) is connected to at least one of the first filaments; wherein the at least two electrical terminals (13, 15) comprises a first electrical terminal and a second electrical terminal; and wherein, during use, electrical current is conducted between the first electrical terminal and the second electrical terminal via the plurality of second filaments. a heating element, the heating element comprising a mesh, the mesh comprising: a plurality of first filaments extending in a first direction, wherein the first filaments comprise a first material having a first electrical conductivity; a plurality of second filaments extending in a second direction, wherein the first direction is perpendicular to the second direction, and wherein the second filaments comprise a second material having a second electrical conductivity; and wherein the first electrical conductivity is greater than the second electrical conductivity; wherein each of the first filaments comprises a core and a coating overlying the core; wherein the coating comprises the first material, and wherein the core of each of the first filaments is formed from a material having a lower electrical conductivity than the first material; and a plurality of first filaments extending in a first direction, wherein the first filaments comprise a first material having a first electrical conductivity; a plurality of second filaments extending in a second direction, wherein the first direction is perpendicular to the second direction, and wherein the second filaments comprise a second material having a second electrical conductivity; and wherein the first electrical conductivity is greater than the second electrical conductivity; wherein each of the first filaments comprises a core and a coating overlying the core; wherein the coating comprises the first material, and wherein the core of each of the first filaments is formed from a material having a lower electrical conductivity than the first material; and at least two electrical terminals (13, 15) for supplying electrical power to the heating element; wherein each of the electrical terminals (13, 15) is connected to at least one of the first filaments; wherein the at least two electrical terminals (13, 15) comprises a first electrical terminal and a second electrical terminal; and wherein, during use, electrical current is conducted between the first electrical terminal and the second electrical terminal via the plurality of second filaments.