- Firing weapons. Generally energy weapons cause the most heat and ballistic weapons the least.
- Sprinting causes 5 heat.
- Jumping causes 5 heat + 5 heat per hex
All heat generation is multiplied by 1.65?
If a 'Mech's heat exceeds the overheat threshold at the end of a turn, it will take internal structure damage. The threshold is 50% + 5% per point of Guts of the 'Mech's heat capacity.
Reaching the end of the heat capacity will cause a shutdown.
Heat is removed by heat sinks. Every 'Mech gets 10 heat sinks included as part of their reactor. Some 'Mechs may mount additional heat sinks.
Standing in water doubles the effectiveness of heat sinks.