On 26/05/2017 21:40, Harry Bloomfield wrote:
rick used his keyboard to write :
Yet the facts seem to be:

Propane = 96 Megajoules of energy per cubic metre.

Butane = 126 Megajoules of energy per cubic metre (far more than
propane)

There is more heat / better value to be had from butane.

That is correct, however butane regulators run at 28 mbar and propane at
37 mbar, or at least they should.

I thought the idea was that the gasses at these pressures gave
approximately the same output for the same injector/burner. It's not a
coincidence that (126 / 96) x 28 = ~37