Watts 0066607 Tank

The Watts 0066607 ET-60 expansion tank is a critical component for maintaining system stability in high-demand residential and commercial closed-loop hydronic heating environments. Engineered to manage thermal expansion, this non-potable hydronic expansion tank prevents dangerous pressure surges that trigger relief valve discharge. This model features a high-grade carbon steel tank construction with an epoxy finish to prevent external corrosion. Internally, a heavy-duty butyl diaphragm creates a permanent barrier between system water and the air charge, effectively eliminating air migration and reducing the need for frequent recharge cycles. The 0066607 is designed for easy inline mounting or floor support, featuring a standard 1/2-inch MNPT connection and a pre-set 12 PSI air charge that can be adjusted via the integrated Schrader valve to match specific hydronic system requirements.

Key Benefits:

• Durable Butyl Diaphragm: High-density membrane minimizes air permeation, ensuring steady system pressure and reducing internal tank corrosion.
• Closed-Loop Compatibility: Specifically optimized for hydronic heating and cooling systems, including those utilizing glycol-based heat transfer fluids.
• Epoxy-Coated Steel: Rugged carbon steel shell provides superior resistance to mechanical stress and environmental wear in mechanical rooms.
• Precision Thermal Management: Safely absorbs expanded water volume at temperatures up to 220°F and operating pressures up to 75 PSI.
• Universal 1/2-inch MNPT Fitment: Standardized threading allows for seamless integration with existing supply piping and air separators.

Common Questions:

• How do I verify if my expansion tank has failed? If the relief valve is constantly dripping or the system pressure climbs rapidly during a heating cycle, the diaphragm may be compromised. Depress the Schrader valve briefly; if water exits instead of air, the tank requires replacement.
• Can this tank be installed in a potable water system? No. The Watts ET-60 is strictly for non-potable hydronic applications. For domestic hot water expansion, a lead-free rated potable tank must be used to comply with the Safe Drinking Water Act.
• Does the pre-charge need to be adjusted before installation? Yes. To maximize diaphragm life and performance, technicians should adjust the air charge to match the system's static fill pressure (usually 12-15 PSI) while the tank is disconnected from the system.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.