EV2's heat doesn't reset at the end or start of a wave.
In some cases, it even increases making her unable to use abilities at all at the start of waves.
not only EV the mystic also has this problem . but in the mystic case it's a good thing!
Another issue that may be related to this is that between waves heroes don't get healed back up, and harbinger buff (yellow mana crystal) doesn't seem to be removed between waves either. This was probably something that was changed in the "journey begins" update. When fixing the "Fixed an issue where EV2 would have full heat at the start of a Combat Phase." issue. So perhaps the ev2 heat issue was always there, we just didn't see it, because the stats would be reset between waves and now they aren't anymore.
It doesn't matter what costume I wear for EV2 either. And however much total heat I can take is the amount I start with 100, 150, 175, etc). The only work around I know of right now is to start the wave with another hero & then switch to EV2 after wave starts. This way, she will have however much heat she started with before the wave started. NOt the best way to start a wave, but better than having full heat.
ev2's heat does not reset is considered a hot issue, funny pun; but yeah I've noticed this one too but I'm not sure if trendy meant to make it like that
It goes up to 100 at the beginning of every round, even if it was 0 before you hit start.