I don't think you will find a definative answer. I posted this question on a couple of other threads, but had no luck. I am building a single tier propane fired system and was trying to decide which burner to buy. I read as many of the threads as I could. From what I can tell, it depends on what the author has. Almost no one will say they made a mistake on burners (pumps, stands, etc....). They will modify what they have until it suits/surpasses their needs (which is a great trait of the HB's). Having said that, I just took delivery of the following:
2 x High Pressure 0-30-PSI Adjastable Regulator-7850 (BY7850) $49.90
2 x High Pressure Cast Iron Banjo Burner-BG14 (BYBG14) $67.92
Sub Total: $117.82
Shipping: $17.66
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Total: $135.48
As you can see, the regulators cost more than the burners. I'll let you know when I fire it up how long it takes to boil 5gal., 10gal. However, that won't be for a few days. HTH, Luck - Dwain