Modine Spark Ignition Control (HD30 - HD125) - 5H79749 Spark Ignition Control for Hot Dawg Heater Spark Ignition Control for Modine Hot Dawg Heaters (all Models HD30-HD125) Works With the Following Models: HD30AS HDS30AS HD45AS HDS45AS HD60AS HDS60AS HD75AS HDS75AS HD100AS HDS100AS HD125AS HDS125AS