@freemo It makes H2O and CO2 because it is also combustion.
@freemo TATP or Tri Acetone Tetra Peroxide is a good example of a molecule that deflagrates. It requires initiation energy and starts a reaction that requires heat but results in Acetone being liberated. I think it's an elimination reaction.
@AmpBenzScientist deflagrate just means a chain reaction of heat.. its a broader category than an explosion. Almost anything that burns is deflating. A campfire is deflagration. Its nothing special.
@freemo An energetic decomposition.
@AmpBenzScientist When/if something is deflagrating then it isnt endothermic by definition.
With that said you would be right there are some sort of edge cases where an explosion can actually result in cooling rather than heating. A pressurized tank at room temperature suddenly cracking open would cause an explosion that would cool down as the gas expands.