About the Honeywell TK300-30 Heating Expansion Tank
Save on the Honeywell TK300-30 4.4 Gallon Heating Expansion Tank. The Honeywell Expansion Tanks absorb hot water expansion in closed heating systems. They are equipped with butyl diaphragms to separate the air from the system water. Pre-pressurized, the tank keeps fluids circulating and maintains minimum pressure.