BKVP
Minister of Fire
So yes, most of the thermostat units are same bodied, blades, set collars and rods. Range of motion as well, although some variation by models exists.@BKVP
I am referring to physical range of motion of the mechanical components. I can imagine that these parts and pieces are assembled and adjusted the same every time at the BK assembly line. I asked the question so as to better understand what others are experiencing as they describe thermostat adjustments on their BKs.
I recognize that with the insert burning along nicely, the max CCW ("closed" position) is beyond the point where the fire will stay lit.
When cold, the thermostat knob on my Sirocco Insert (SC25) exhibits a physical stop at the full open position (6 o'clock). Throttling down, it moves freely for about 120 degrees to the 2 o'clock position (a little past the narrow end of the white swoosh) where it meets high resistance. This "closed" setting is a little past the narrow end of the white swoosh (3 o'clock).
When hot, I notice no change in the physical stop at full open, and only a marginal change at the closed position.
For the wood that I have been using, adjusting the knob to about the narrow end of the swoosh gives me the longest burn times. Of course every load is a bit different, as every day's temperature, humidity, wind, etc, is different as well.
Just to reduce the chance of being misunderstood, my BK Sirocco insert is working perfectly and performs far better than I could have ever hoped for![]()
Of course the decision years ago to remove numbers from the decal and instead use the swoosh was for the very reason you asked. (If I understood you correctly)
Stove owners were trying to compare their performance attributes based upon how other owners of the same stove(s) performed based upon where the knobs white line pointed. This created major headaches for us as a manufacturer.
Our phones range continuously with "hey I'm only getting a 15 hour burn time on #2 and a guy on @$%^.com is getting 24 hours. My stove is defective. "
We just tried over and over to explain where you must place the thermostat to maintain combustor activity on low is highly influenced by indivual draft scenarios, piece size, fuel type (based upon variation in specific gravity), moisture content and more.
Ideally, you learn where to place the thermostat to make you satisfied!
Thanks for allowing me to expand...