The HTP 7250P-279 Munchkin Hot Surface Ignitor is an OEM replacement ignition component designed for HTP Munchkin HA (High Altitude) gas-fired boilers. It works by electrically heating its igniting element to a high temperature, providing the heat needed to ignite the burner’s gas-air mixture and initiate combustion. This ignitor is specifically used in compatible Munchkin boiler mode... https://www.partshnc.com/htp-7250p-279-munchkin-hot-surface-ignitor