luuuuuuuuuuuuurve my Blichmann Top Tier. When I win the lotto, I'm going to get a few more and the stand. I haven't run any tests, but it is an extremely propane-efficient burner from what I've read.
For my puny five gallon batches, I can take an 8 gallon brewkettle from mash/runoff temp to boiling in about 10-15 minutes.
Also, FWIW, my group Baltibrew did a 2 BBL brew split between 2 kettles/burners, and it got those up relatively quickly on full blast as well.
We need pics when this is done.
Love me some brewin' p0rn!