• Total Chiller Capacity (Tons) • Chiller Manufacturer’s Recommended System Volume* • Actual System Volume (Gallons) Zilmet ZCBT Chilled Water Buffer Tank Sizing and Zilmet ZHBT Hot Water Buffer Tank Sizing Oct2020 *Chiller manufacturers recommend between 3 to 6 gallons per ton for typical HVAC and 6 to 10 gallons per ton for nominal cooling when temperature accuracy is critical. This pdf will calculate for you. Enter the variables in the three highlighted sections. The example shows sizing for a 260 gallon tank. Choose a Zilmet ZCBT-300. Chilled Water Buffer Tank Three input variables are required: • Boiler Cycle Time* (Minutes) • Minimum Boiler Output (BTU/Hr) • Minimum Rate of Heat Extraction from tank** (BTU/Hr) • Temperature Differential*** (F) This pdf will calculate for you. Enter the variables in the four highlighted sections. The example shows sizing for a tank of 100 gallons. Choose a Zilmet ZHBT-120. Hot Water Buffer Tank Four input variables are required: