If it's a small twist skip the hot water. Put the bow in a vise (or clamp to a table) with the limbs horizontal and "on edge". That is, with the width of the limb vertical. Put a bar clamp on the limb with the bar extending horizontally or slightly "uphill" due to the twist in the limb. Hang a weight from the bar to slightly overbend the twisted limb slightly past straight. Leave it for a day or so and check it. If the twist is out, string the bow and leave it strung for a week or so (shoot it if you want, but don't unstring it) to give it a chance to "get used to" its new position. If it's still twisted, put the weight back on and leave it a while longer. Heat is helpful for large twists but for a minor twist, just twisting it back usually works.