This invention provides a tablet that effervesces and significantly warms the water that it is dissolved in. The effervescence acts to break up the tablet allowing an exothermic material to rapidly dissolve releasing its heat of solution. The invention is unique in that no organic acid is required to form a conventional effervescent couple.Cette invention concerne un comprimé effervescent qui réchauffe significativement leau dans laquelle il est dissous. Leffervescence agit pour rompre le comprimé permettant à une substance exothermique de se dissoudre rapidement en libérant sa chaleur de solution. Linvention est unique en ce quelle ne requiert aucun acide organique pour former un couple effervescent traditionnel.