Numerical simulations of the firing of H2–O2 igniters in the presence of an air-O2 crossflow are conducted with a specific focus on air-heater configurations with faceplates. Simulations are conducted for three igniter chamber pressures (22, 41 and 55 bar) to investigate penetration lengths of igniter flames into the crossflow. Two alignments of the air-heater faceplate are assessed: one where the igniter-injector jets exhibit a direct interaction (Case 1), and one where the igniter jet is fired in-between two adjacent injector jets (Case 2). For all three igniter chamber pressures, air-heater faceplate heating is lesser for Case 1 compared to Case 2 because the igniter flame is naturally deflected away from the faceplate here. Moreover for Case 1, the 41 bar igniter chamber pressure shows the least peak heating of 68 W/cm2. For Case 2, with the 22 bar igniter chamber pressure, the igniter flame is deflected markedly towards the faceplate because of entrainment-instigated suction between two injector jets. This shows the highest peak heating on the faceplate of 467 W/cm2. When the igniter chamber pressure is increased, the extent of deflection reduces, as does the peak heating on the faceplate. Notwithstanding, hot-spots near the centre of the faceplate are still evident even at higher igniter chamber pressures.