Zilmet zhp202bh Well Expansion Tank 21 Gallons

Product Description

The ZILMET zhp202bh is a 21-gallon horizontal well expansion tank designed for residential and light commercial potable water systems. Part of the Hydro Plus series, it uses a butyl diaphragm inside a carbon steel shell to maintain system pressure and protect pump cycles. The tank ships precharged at 38 psi and is rated for a maximum working pressure of 150 psi. A pump bracket is included for direct mounting support. This tank is installed by licensed plumbers servicing well water supply systems where pressure regulation and tank volume are critical to pump longevity and system performance.

The zhp202bh is suited for residential well systems requiring horizontal tank orientation due to space constraints or mounting preference. Its side connection design simplifies integration into existing plumbing runs. The included pump bracket allows the tank to be mounted alongside the pump assembly, keeping the installation compact. This tank fits typical applications where a precharged diaphragm-style pressure vessel is needed to reduce pump short-cycling and maintain steady delivery pressure throughout the distribution system.

Key Features

• 21-gallon capacity with 38 psi factory precharge for immediate installation
• Butyl diaphragm construction resists water absorption and maintains long-term flexibility
• Carbon steel shell rated to 150 psi maximum working pressure
• Horizontal orientation with side connection for flexible placement in tight mechanical spaces
• Includes pump bracket for integrated mounting support
• 5-year warranty backed by the manufacturer

Compatibility

Designed as an OEM-style replacement or new-installation diaphragm well expansion tank for residential and light commercial potable water pressure systems using a 1-inch connection.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and IPC guidelines. Shut off the water supply and relieve all system pressure before disconnecting or installing any pressure vessel. Verify the tank precharge pressure matches the system cut-in pressure before placing the unit in service, using an air pressure gauge at the Schrader valve. Do not exceed the 150 psi maximum working pressure rating under any operating condition.

Technical Specifications

• Tank Volume: 21 gallons
• Precharged Pressure: 38 psi
• Maximum Working Pressure: 150 psi
• Connection Size: 1 inch
• Diameter: 17.7 inches
• Height: 19.1 inches
• Weight: 37 pounds
• Diaphragm Material: Butyl
• Shell Material: Carbon Steel
• Orientation: Horizontal
• Application: Plumbing
• Warranty: 5 Year

Standard Information

• Brand: ZILMET
• Manufacturer Part Number: zhp202bh