1-1/4" Carbon Steel Bottom Connection Well Tank, Hydro Plus, 54.7 gallon

Zilmet ZHP250BC – 54.7 Gallon Pre-Pressurized Well Tank with Bottom Outlet

The Zilmet ZHP250BC is a 54.7-gallon diaphragm well tank engineered for use in potable water systems requiring consistent pressure regulation and reduced pump cycling. Designed for vertical installation, this model features a bottom-mounted 1-1/4" NPT connection and a compact profile optimized for space-constrained mechanical rooms or well enclosures.

Constructed from carbon steel and finished with a corrosion-resistant powder coating, the tank includes a seamless butyl rubber diaphragm bonded to an NSF 61-certified polypropylene liner. The sealed air charge maintains system pressure while preventing waterlogging over time.

Technical Specifications

• Total Tank Volume: 54.7 gallons
• Connection: 1-1/4" NPT bottom outlet
• Maximum Working Pressure: 100 psi
• Diaphragm Material: Butyl rubber, full-depth seamless construction
• Inner Liner: Virgin polypropylene (NSF/ANSI 61 compliant)
• Exterior Finish: Epoxy-polyester powder coating

Design Features and Performance

• Bottom Connection Design: Allows straightforward vertical installation and stable piping geometry
• Short and Wide Profile: Reduces diaphragm deformation and improves service life under cyclic pressure loads
• Pre-Charged Air Chamber: Factory set; adjustable in the field to match system fill pressure
• Full Volume Drawdown Support: Ideal for residential and light commercial applications using submersible or jet pumps

Installation Guidelines

The ZHP250BC must be mounted vertically on a solid, level surface that supports its operational weight. Ensure clearance for access to the Schrader valve and for pressure adjustments. Adjust the pre-charge to match the system’s cut-in pressure before filling. All installation must comply with local and state plumbing codes. Professional installation is recommended for optimal system sizing, connection integrity, and code compliance.

Application Scope

Designed for use in residential and small commercial potable water systems requiring reliable pressure stabilization and expanded drawdown volume. The tank is compatible with standard control switches and pressure regulators found in typical well installations.