66 Gal. Water Well Tank

Zilmet ZHP251 – 66 Gallon Pre-Pressurized Well Tank for Potable Water Systems

The Zilmet ZHP251 is a 66-gallon vertical diaphragm well tank designed for use in pressurized potable water systems. This pre-charged model combines high-volume storage with stable pressure control, making it suitable for residential and light commercial well installations. Its seamless diaphragm and NSF/ANSI 61 certified components support long-term performance in environments where reliable pressure regulation is critical.

The internal configuration separates the air and water chambers with a butyl diaphragm bonded to a polypropylene liner. The tank body is fabricated from welded carbon steel and finished with a corrosion-resistant powder coating for extended service life in mechanical rooms, basements, or well enclosures.

Construction and Performance Features

• Total Capacity: 66 gallons
• Connection Size: 1-1/4" NPT bottom outlet
• Maximum Working Pressure: 100 psi
• Diaphragm Material: Seamless butyl rubber
• Internal Liner: Virgin polypropylene
• External Finish: Epoxy-polyester powder coat for corrosion resistance
• Certification: NSF/ANSI 61 listed for potable water applications

System Integration Benefits

• Pre-Charged Configuration: Supplied with a factory air charge; field-adjustable to match pump cut-in pressure
• Diaphragm Design: Full-membrane depth reduces material stress, improving longevity and drawdown consistency
• MIG Welded Steel Shell: Enhances structural integrity and eliminates sharp interior seams
• Bottom Outlet Orientation: Streamlines system layout in vertical installations and minimizes fitting strain

Installation Considerations

The ZHP251 must be installed vertically on a solid foundation that supports static tank weight. Prior to commissioning, verify and adjust the air pre-charge to match the system’s static pressure. Tank placement should allow access for periodic inspection and service. All installations must comply with applicable plumbing codes and industry best practices. Use by qualified plumbing professionals is recommended for proper system sizing, valve orientation, and safety compliance.

Application Suitability

This model is designed for use in water well systems utilizing submersible or jet pumps. It is best suited for applications requiring moderate-to-high drawdown capacity, including residential properties with higher demand profiles or commercial buildings using conventional pressurized well systems.