Firebug!
If you ever encounter a problem with a "Blow Torch Noise" when the unit is ignited and burning, give me a shout. Jotul had to revamp their burner plates or tray to eliminate the problem. This was on the Firelight DV 600 Models, I don't know if it is a problem with their other models.
I was told by a Gas Engineer, that if left uncorrected, it can damage the burners and the stove.
That "Blow Torch" noise is generally only related LP units.
Because the LP is heavier than air, it can acculmulate UNDER the burner (puddling)
& not ignite from the pilot, until the LP has built up high enough for the flame to reach it.
This will cause two ignition points. One is on the burner & the second is at the air shutter.
I have seen it occur in Jotul, Heat n Glo, Regency & Hearthstone gas units.
I am sure Jotul has since corrected the problem on their current production runs, unlike some other companies.
The Jotul problems seemed to stem from the alignment of the burner orifice into the burner tube.
In my OWN experience, this doesn't happen at the factory, because Jotul ships ALL units NG ready...
The LP conversion is done at the dealer & if the tech isn't careful, he can change the
position of the burner orifice during the conversion, resulting in a misalignment.
More often than not, simply angling the first hole in the burner towards the pilot flame will eliminate the problem.
Many of the HnG units are easier to correct than others, because of the ceramic burners they use.
One or two extra holes can be drilled to direct the gas towards the pilot & the
LP will ignite before it drops to the air shutter...
I realize you've endured a lotta crap from your HnG product & your dealer, but their products are
(for the most part) pretty hi-quality units, & perform admirably in most installations.
The odds of you getting TWO lemons from them are astronomical in most cases,
but I'm sure that doesn't make you feel any better