What happen if you jump the heat levels?

[Frederick White]

For example, If I jump from 10 heat to 20 heat instantly will I get 10 titan blood in a single run if I beat Meg?

[wpegg]

no, it says in the tooltip there is no benefit to doing this. You won't even be getting bonuses for heat 20, you'll complete a heat 20 run and unlock the bonuses at heat 10.

[Hariman]

If you can handle the high heat challenge, you don't have to lower your heat while unlocking the lower heat levels.

[admiral1018]

You unlock the bonuses for whatever the heat limit is on the gauge. So, for example, if the pact says to fill to heat level 3 for bonuses, and you do 20 heat, you will only get the bonuses for level 3. The next time with that weapon, you will be able to get bonuses for level 4.

There is no downside to going above the heat threshold other than added difficulty, so feel free to do that if you want to experiment with different punishments of want an added challenge. Just think of the heat limit as the minimum needed for rewards, not the required level.

[Puzzlemint]

Worth noting: there is one exception to the explanations given above. The rewards for Heat 0 can only be claimed on Heat 0.

So if you have a weapon you haven't claimed the Heat 0 rewards for, jumping straight into Heat >0 will cause you to miss those rewards until you go back to Heat 0 with that weapon.

[GiantOctopodes]

Also you'll get special dialogue if you are in a run with the heat gauge high enough. I'm not sure if it's just "heat gauge way over the line!" which does the trick or if "heat gauge greatly exceeded!" does as well, but certain folks will comment on it and ask what the hell you're doing, it's quite funny.

Also, implied by the above responses but to spell it out, since you're actually clearing the 10 heat bounty in your example if you got partway through and say died in Elysium, any subsequent runs with that weapon at 10+ heat will reward darkness at the Meg and Lernie fight, you don't need to stick with the heat level you were trying it on. It's all just progress towards the one bounty.