1-1/4" Carbon Steel Bottom Connection Well Tank, Hydro Plus, 39.6 Gallon

Zilmet ZHP204BC – 39.6 Gallon Pre-Pressurized Well Tank for Potable Water Systems

The Zilmet ZHP204BC is a 39.6-gallon vertical diaphragm well tank designed for use in potable water systems. Engineered to reduce pump cycling and maintain consistent water pressure, this model is well suited for residential and light commercial well water applications. It features a welded carbon steel shell and internal diaphragm to separate water from the air charge, ensuring long-term pressure stability and system efficiency.

This tank is pre-pressurized at the factory and equipped with a seamless diaphragm and polypropylene liner to prevent air absorption and waterlogging, contributing to a longer operating life with minimal maintenance.

Key Technical Features

• Total Volume: 39.6 gallons
• Connection Size: 1-1/4" NPT (bottom-mounted)
• Maximum Working Pressure: 100 psi
• Shell Material: Carbon steel with corrosion-resistant exterior powder coating
• Diaphragm: Seamless synthetic SBR rubber, permanently bonded to a virgin polypropylene liner

Performance Characteristics

• Pre-Charged Design: Reduces pump starts and protects system components from rapid cycling
• Seamless Diaphragm: Minimizes flex fatigue and eliminates points of failure common in bladder-style tanks
• Internal Water-Air Separation: Maintains consistent drawdown and pressure regulation
• Bottom Outlet Orientation: Allows for direct system connection and vertical tank placement

Installation Guidelines

Install the ZHP204BC vertically on a level, structurally sound surface. Confirm the air pre-charge matches the system’s cut-in pressure before filling. Pipe connections must be compatible with 1-1/4" NPT and should allow for tank drainage and servicing. All installations must comply with local plumbing codes and standards for pressurized potable water systems. Installation should be performed by qualified personnel with experience in well tank sizing and system integration.

Application Scope

This model is designed for residential well systems where moderate drawdown capacity is required. Compatible with submersible and jet pump systems operating within standard pressure ranges. Ideal for installations requiring reliable pressure control and long tank service intervals.