Lets See All The eBIAB Rigs!

[zygaxicon]

It really depends. If you have a strong heating element (mine is 5500w) then it'll heat up rather quickly. My preboil is usually ranging from 7 - 8.5 gallons, and it really heats up to boiling in just under 8 minutes or so. I also get a pretty big boil off from that element so my PID helps regulate the electric pulse so I don't go below my post boil volume.

 

[brewman !]

10 gallons = 83 pounds of water.

1 Kw = 4312 BTU/hr @ 100% efficient.
5.5 Kw = 23,716 BTU/hr

Prior to boiling, 1 BTU raises 1 pound of water 1 degree.

23,716 BTU/hr / 83 lbs = 285 degrees per hour or 4.76 degrees per minute, assuming 100% efficiency and no kettle heat loss. Say 4 degrees per minute in the real world.

212 - 160 = 52F. 52F / 4 = 13 minutes.