Sorry forgot to add that I only do 6g brews (23l) so I expect not to need the extra grunt.
Is gas or induction better?
I will time my zero to mash and mash to boil and see how it compares.
Next brew this weekend.
For 6 gallon batches (and a bit larger) the IC3500 is just perfect, and economical. Plus I use it for wokking, frying, and making large batches of soup, sauce, stew, and what not.
Sample scenario:
On brew day, I start heating strike water, then weight and mill the grains. By that time the strike water is about ready. After filling the mash tun, I let it sit for 5-10 minutes, take and correct the temp if needed and start mashing. About 20 minutes before the mash is done I start heating sparge water.
As soon as the first gallon of first runnings gets into the kettle I start heating them together with FWH. I keep adding more wort as it gets lautered. By the time the 2nd sparge is completely lautered I'm 15 minutes from boiling.
Is gas better than induction?
The heating capacity of propane or NG using a large banjo (or jet) burner is way more than the IC3500, even while almost half of that energy is wasted to the environment.
For a 6 gallon brew I can get 3-4 gallons of strike water ready in 5 minutes on my Blichmann burner, at full bore. I wouldn't have my grains ready by then, though. Now for 10-20 gallon batches the scenario changes, the potential heating output of gas gets an advantage over the IC3500, unless you use supplemental heating sources, such as elements, heating sticks, split boils, etc.