I heat my 60 quart pot right on the stove. It's electric with glasstop, so the heating might be more even. No scorching.
However, I fill the milk in at 10pm, go to bed, rise at 5 or 6am, and set the burner at 1/3 full heat. Takes an hour or two and the milk is 90ºF.
If you wham up the heat, I bet you'll get scorching.
It's amazing how cold the milk stays overnight for 8-10 hours. It's about 35ºF when put into the pot, and it's about 55ºF when I get up. Still cold! And the air temp in my house is almost always above 70ºF round the clock.