The exclusivity and capacity of the ECO SV exchanger brilliantly avoid the typical problem of all water boilers that use woody biomass: the buildup of combustion residues (e.g., creosote, pitch, and others) on cold surfaces. Since the exchanger has fins welded onto the contact surface—making them fixed and non-removable—it turns the structure into a dry chamber (patented system) that becomes incandescent as the fumes pass through, exceeding the lysis temperature of unburnt smoke particles and distillates, further burning them. As these combustion deposits burn, they produce additional energy and transform into easily removable ash. Throughout the entire life of the boiler, the efficiency remains constant, from the first to the last day of use, because no accumulation of creosote or deposit of unburnt material occurs in the exchanger, with the advantage of being able to burn any type of wood or biomass without ever clogging.