It would be marginally less effective, but not to any degree you might notice without testing in a lab. fire needs three things heat, oxygen, and fuel. tossing water on fire deprives fire of oxygen by displacing the air as a liquid and as water vapor, and it removes heat because it takes a very large amount of energy to heat water up. so even water at boiling can still absorb more heat and turn into steam completely removing two of the three things fire needs to exist. it honestly is less of a chemical reaction and more of a physical one, thru displacement and heat absorbtion, so the temperature of the water would not affect it to any noticable degree. ELI5 no it doesnt matter because water is really good at putting out most fires.
(note with oil and some other types of fire it wouldnt help no matter what temperature)
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