Yes, it is. I wouldn't go higher than 100F tops.
Have you measured it with a thermometer at the sink? Or are you going with what your HWH is set for?
If the latter, you're wasting a lot of energy, roll that puppy back to 115F, and watch your power bill drop.
Even after you cool the water, your brushes may continue to shed for a few days.
But reducing the water temp ASAP may help to prevent future damage.
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Is 124° F (51° C) water too hot for knot glue?