Gas is lit with an electronic hot surface igniter on call for heat.
Most propane heaters have pilot flames which must stay lit for the heater to perform. With a hot surface igniter, you don't have to worry about drafts putting out the flame. Another advantage of the hot surface igniter is that there are no fumes released from it like with pilot flames. Every Hot Dawg heater features a fan powered vent exhaust. This is especially important when using gas powered heaters in greenhouses.