I'm sure many will find Keith Hale's brazing article interesting. I recently (last week) purchased his book from the CuP Alloy website, which I recommend.
CuP Alloys home page
The table on page 35 contains a typo; the burner 7291 (supplied with one of the Sievert blowtorch sets, i.e., the professional torch kit) outputs 7.7kW at 2 bar, and 14 kW at 4 bar – it is shown in the next columnm attached to the front of the 600 grams per hour at 2 bar.
Some of the gas usage data for other burners slightly differs from his book (p.53), a typo or perhaps revised downwards with more recent burners, but not by a significant amount. This is not to criticise the article in any way.
As ever, no association with CuP, just a happy customer.
Bill