We have a 2003 Heat n Glo fireplace insert with a delay and boom when propane ignites. It sometimes shakes the glass and is scarey! It has been cleaned, with pilot a mix of yellow and blue, and noticable dust below the stove where wires are, which the serviceman didn't bother to clean. We are looking for a more efficient unit, and were told that Valor Legend G4 series has been reliable. And, that Lopi and other manufacturers that use Travis(Travers?) Industry's electronics are having problems with reignition in many models. Any suggestions for us? Any one have a stove using propane that doesn't go boom? Thanks!