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There are far more spontaneous/favorable reactions that are exothermic than there are ones that are endothermic. This is because releasing heat to the surroundings is thermodynamically beneficial---it helps increase the entropy of the surroundings. So if you want to get something done, exothermic reactions tend to be good. It could also be that the heat evolved helps dissolve, loosen, etc. whatever is clogged. The other things plummers do is piping... they burn propane to heat copper pipe and solder fittings on. It is good to have an exothermic reaction there to melt the solder.

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15y ago
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Q: Why do plumbers use chemicals with exothermic reations?
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