SureSpark™ High Energy Exciter Our SureSpark High Energy Ignition System is expertly engineered to provide the most reliable fuel ignition for your toughest combustion applications—even in high-moisture areas. Whether you’re firing gas, light oils, bio-diesel or heavy oils (residual fuels), SureSpark HEI gives you efficient, effective performance light after light. With the SureSpark system, you can count on unparalleled ignition reliability and repeatability so you can avoid the cost and hassle of maintaining a back-up starting fuel system.