Comment by quickthrowman

You could run (10) of these 9kW 480V three-phase immersion heaters [0] in place of your 85 HP motor, assuming ~110A FLA @ 480V = 91.5kW. The 9kW immersion heaters are 10.8A each at 480V three-phase (would be 75A if it was 120V single-phase!)

Just make sure you have somewhere for the steam to go, it takes up a bit more room than water ;)

Is your three-phase a corner-grounded delta service? I’ve never seen one in the wild but I hear they’re used for three-phase ag service drops that are strictly used to run motors. A and C are tapped normally on the secondary but the B phase is bonded to ground and also a line conductor, conductor color is white for B phase instead of orange.

[0] https://iseinc.com/_shop/480v-3ph-9kw-immersion-heater-47-14...