The John Wood Company (Schwenksville, PA) introduces a new, automatic glycol makeup system that automatically controls the mixture of glycol and water in hydronic heating and cooling operations, preventing overheating and overcooling. The three available tank sizes use the same base and the same 1/3-hp pump. All units are equipped with a pressure relief valve, a low-level cutoff alarm, pump control box, and all required pumping and valving.