I got my 18" Vault! Easy to assemble but I had problems with the alignment of the burner valve and the front panel. Couldn't get the screws and dial on without bending the front panel and shimming the burner drum. I got past that. I'm now seasoning and taking data.
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There's a bit of slop in the burner knob. When I set at MED (the knob arrow at the E), I can move the knob to the M and D with no movement of the actual valve.
Anyway, I'm running empty with a tray of water, side vents partially closed and using maverick dual probe temp monitors I'm getting:
(upper, mid, lower rack)
264, 248, 212 Knob arrow at M (on medium)
235, 219, 185 Knob arrow at E (on medium)
219, 205, 180 Knob arrow at D (on medium)
I'm considering the Bayou Classic regulator with a needle valve for finer adjustment but I'm concerned about putting the 10psi regulator on it. From some of what I've read here, the needle valve can be difficult to dial in because of the 10psi and the regulator rated for 55,000 - 80,00 BTU. The Vault burner is only 18,000 BTU.
I think I can manage with data above. I also can't wait to take data with some meat inside to see how the top to bottom temp changes