My dealer installed the new pb105 pressure ignition system today in hopes that it will resolve the burnpot bubbles that I have had over the past two years. This ignition system is now being used on the new pf100 furnaces and pb105 boilers. In my mind, with the igniter not in the burnpot, the hot air for ignition is directed onto the pellets as they are fed into the burnpot, I don't see how a bubble on the surface of the burnpot could form now. The new ignition system sure does ignite the pellets quick.