...How hot does it have to be before the
> brood gets killed?....

In 1954, Lindauer placed a beehive on a lava field in
Italy where temperatures reached 70°C. The bees were
able to maintain a brood nest temperature of 35°C.
This was dependent on the bees ability to collect
water for cooling.  This ability to collect water is
essential to cool the broodnest.  And if hampered, it
could be catastrophic to the colony and brood.





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