The Watt Expansion Tank is a critical component designed to manage the expanded volume of hot water in heating systems, ensuring that system pressure remains below the relief valve setting. This tank plays an essential role in preventing pressure buildup and protecting the system from potential damage due to excessive pressure changes.

The tank contains a fixed butyl bladder, which is FDA-approved, to separate the air and water chambers, allowing for controlled expansion and contraction as water temperature fluctuates. This bladder system ensures that pressure is maintained at a safe level while preserving the integrity of the system.

Pre-charged to 40 psi, the expansion tank is field-adjustable to meet the specific needs of different systems. It includes a charging valve connection, allowing for on-site adjustments to ensure optimal performance. The tank features a durable carbon steel shell with a stainless steel system connection, providing enhanced strength and resistance to corrosion.

Compliant with ASME Section VIII construction standards, the Watt Expansion Tank is designed for long-term reliability. It also comes equipped with a bladder integrity monitor, offering peace of mind by ensuring that the bladder remains intact and functional. The tank is NSF/ANSI Standard 61 compliant, ensuring it meets stringent health and safety standards for use in potable water systems.