I suppose if you boil the vin chard long enough and at a high enough heat, the alcohol will evaporate. Therefore it will be almost alcohol-free vin chaud! Just keep in mind that it will take hours to get rid of all the alcohol. According to one study (US Department of Agriculture) cooking the wine, especially at high heat will burn off much of the alcohol, but not 100%. 1 hour of boiling might reduce the amount by 75%.