2.1 Gal. Hydronic Wall Hung Expansion Tank with Union Check, Flat

Zilmet ZFT8C-15 – 2.1 Gallon Flat Wall-Hung Expansion Tank for Hydronic Heating Systems

The Zilmet ZFT8C-15 is a 2.1-gallon diaphragm expansion tank designed for wall-mounted installation in closed-loop hydronic heating systems. Its flat, low-profile design is optimized for use with compact wall-hung condensing boilers where space constraints and integrated system layouts require streamlined components.

This model includes a factory-mounted union connection with integrated check valve and is suitable for pre-assembly on hydronic control panels or support frames prior to final installation. The internal diaphragm separates the system fluid from the air charge to prevent waterlogging and maintain consistent operating pressure.

Technical Specifications

• Total Volume: 2.1 gallons
• Mounting Type: Wall-hung, flat profile
• Dimensions: 16" H × 16" W × 5" D
• Connection Size: 1/2" NPT with integrated union and check valve
• Diaphragm Material: Butyl rubber
• Tank Shell: Welded carbon steel with corrosion-resistant coating
• Maximum Operating Pressure: 90 psi
• Application: Closed-loop heating systems using wall-hung or compact boilers

Design and Performance Features

• Flat Profile: Designed for space-limited wall installations near modular boiler systems
• Pre-Charged Configuration: Factory pre-charged with air; adjustable in the field to match static fill pressure
• Union Check Valve: Included for simplified installation and backflow prevention
• Pre-Assembly Capability: Can be mounted to system control boards or manifolds before jobsite installation

Installation Considerations

The ZFT8C-15 is intended for vertical wall-mounted installation using appropriate brackets or hardware rated for the tank’s static load. Verify the air pre-charge before filling the system, and ensure clearance for future servicing. All installations must comply with local mechanical and plumbing codes. Professional installation is recommended for proper integration with modulating boiler systems, particularly those using pressurized panel assemblies or zone manifolds.

Application Scope

This model is suitable for single-zone or multi-zone hydronic heating systems that utilize wall-mounted condensing boilers. Its compact form factor and included union valve make it particularly effective for installations requiring minimal system footprint and simplified maintenance access.