A hydronic system for heating and/or cooling fluid feed additives passing through a delivery line is disclosed. The system includes a hydronic heating system which will heat fluid passing through a closed loop radiant line which is closely positioned adjacent a portion of the delivery line extending between the fluid delivery system and the target destination. The system also includes a cooling system which will cool the fluid circulating through the radiant line to cool the delivery line and the fluid feed additive therein. The system of this invention prevents the fluid feed additive from freezing during the cold months and cools the same during warm months.
