A dispensing system (100, 200), comprising: a manifold body (102, 202) comprising a liquid material passage and a process air passage; a heating member (124, 224, 324, 424, 524, 624, 724, 824) received in the manifold body (102, 202), and the heating member having an upper portion, a lower portion, and an outer surface; and a nozzle (122, 222) configured to dispense a liquid material, wherein the heating member (124, 224, 324, 424, 524, 624, 724, 824) has a groove (180, 280, 380, 480, 580, 680, 780, 880) in the outer surface, the groove extends between the upper portion and the lower portion and forms at least a portion of the process air passage, the heating member is configured to heat process air as the process air passes through the groove (180, 280, 380, 480, 580, 680, 780, 880), characterized in that the heating member is configured to heat the liquid material through contact of the outer surface of the heating member (124, 224, 324, 424, 524, 624, 724, 824) with the manifold body (102, 202), and the heated process air is directed to the liquid material as it is dispensed, and that (a) the groove (180, 280, 380, 480, 580, 680, 780, 880) is tortuous and/or non-linear and comprises a plurality of annular segments (182, 382, 482, 582) and a plurality of longitudinal segments (184, 384, 484, 584), the annular segments (182, 382, 482, 582) and the longitudinal segments (184, 384, 484, 584) alternating along a longitudinal length of the heating member; and/or (b) the groove (180, 280, 380, 480, 580, 680, 780, 880) defines a first flow path and a second flow path and the heating member (124, 224, 324, 424, 524, 624, 724, 824) is configured to divide the process air into the first flow path and the second flow path. a manifold body (102, 202) comprising a liquid material passage and a process air passage; a heating member (124, 224, 324, 424, 524, 624, 724, 824) received in the manifold body (102, 202), and the heating member having an upper portion, a lower portion, and an outer surface; and a nozzle (122, 222) configured to dispense a liquid material, wherein the heating member (124, 224, 324, 424, 524, 624, 724, 824) has a groove (180, 280, 380, 480, 580, 680, 780, 880) in the outer surface, the groove extends between the upper portion and the lower portion and forms at least a portion of the process air passage, the heating member is configured to heat process air as the process air passes through the groove (180, 280, 380, 480, 580, 680, 780, 880), characterized in that the heating member is configured to heat the liquid material through contact of the outer surface of the heating member (124, 224, 324, 424, 524, 624, 724, 824) with the manifold body (102, 202), and the heated process air is directed to the liquid material as it is dispensed, and that (a) the groove (180, 280, 380, 480, 580, 680, 780, 880) is tortuous and/or non-linear and comprises a plurality of annular segments (182, 382, 482, 582) and a plurality of longitudinal segments (184, 384, 484, 584), the annular segments (182, 382, 482, 582) and the longitudinal segments (184, 384, 484, 584) alternating along a longitudinal length of the heating member; and/or (b) the groove (180, 280, 380, 480, 580, 680, 780, 880) defines a first flow path and a second flow path and the heating member (124, 224, 324, 424, 524, 624, 724, 824) is configured to divide the process air into the first flow path and the second flow path. (a) the groove (180, 280, 380, 480, 580, 680, 780, 880) is tortuous and/or non-linear and comprises a plurality of annular segments (182, 382, 482, 582) and a plurality of longitudinal segments (184, 384, 484, 584), the annular segments (182, 382, 482, 582) and the longitudinal segments (184, 384, 484, 584) alternating along a longitudinal length of the heating member; and/or (b) the groove (180, 280, 380, 480, 580, 680, 780, 880) defines a first flow path and a second flow path and the heating member (124, 224, 324, 424, 524, 624, 724, 824) is configured to divide the process air into the first flow path and the second flow path.