1" Carbon Steel Bottom Connection Well Tank, Hydro Plus, 21.1 gallon

Zilmet ZHP202BC – 21.1 Gallon Vertical Well Pressure Tank with Bottom Connection

The Zilmet ZHP202BC is a 21.1-gallon pre-pressurized diaphragm tank designed for potable water well systems. This tank regulates system pressure, minimizes pump cycling, and helps maintain consistent water delivery in residential or light commercial applications. Constructed from carbon steel with a corrosion-resistant finish, it features a bottom-mounted 1" NPT connection for streamlined piping configurations.

This model incorporates a seamless synthetic rubber diaphragm and an internal polypropylene liner to isolate water from the air charge, preventing waterlogging and preserving drawdown capacity over time. The shorter, wider profile reduces diaphragm flex and enhances structural longevity under repeated pressure cycles.

Performance and Construction Features

• Total Capacity: 21.1 gallons
• Connection Size: 1" NPT bottom outlet
• Maximum Working Pressure: 100 psi
• Tank Shell: Welded carbon steel with powder-coated exterior
• Diaphragm Material: Seamless butyl rubber
• Internal Liner: Virgin polypropylene, NSF 61 compliant

Application and Design Advantages

• Bottom Outlet Design: Simplifies vertical installation and reduces pipe stress
• Compact Profile: Short, wide configuration supports diaphragm durability and tank stability
• Sealed System: Pre-charged air chamber with serviceable Schrader valve
• Corrosion Protection: Exterior epoxy-polyester finish resists environmental wear

Installation Guidance

The ZHP202BC should be installed vertically on a flat, stable surface capable of supporting the filled tank weight. Pre-charge must be verified and adjusted prior to system pressurization to match pump cut-in pressure. Positioning should allow access to the air valve and facilitate routine maintenance. All installations must comply with applicable local plumbing codes. Professional installation is recommended for optimal performance and safety compliance.

Use Case Suitability

This model is ideal for residential water well systems or small-scale commercial systems requiring reliable pressure stabilization and moderate water storage. It is compatible with jet or submersible pump installations and can be integrated with standard control switches and pressure relief devices.