HONEYWELL TK300-90 14.0 Gallon Heating Expansion Tanks. Honeywell Expansion Tanks are designed to absorb hot water expansion in closed heating systems. They are equipped with butyl diaphragms to separate the air from the system water (glycol). The tanks are a welded, not clamped design. Pre-pressurized at 12 psi, the tank keeps fluids circulating and maintains minimum system pressure. Honeywell tanks resist waterlogging, loss of pressure through relief valve spills, loss of BTUs and reduce circulator running time. Use the super efficient Honeywell PowerVent or air vents to remove air and micro-bubbles from the system for maximum performance.

Features

• Butyl/EPDM diaphragm- 9 times better than natural rubber

• Deep-drawn sttel tank

• Controls system pressure

• Air-tight cushion-factory pre-chared to 12 psig and 100% tested