I generally do not use absolutes, but in this case I will say categorically: DO NOT USE HEAT (immersion or otherwise) for a snake/insect bite in which the toxin’s effect is systemic or away from the site of invenomnation. Applying heat to invenomation site for toxins that will affect the heart, nervous system or are hemotoxin in nature will only hasten the effects and could be lethal.

Pete