Ao Smith 100112156 Lead Free Isolation Valve Kit with Prv

Product Description

The AO SMITH 100112156 is a lead-free isolation valve kit designed for service and maintenance of tankless water heaters. The kit includes a pressure relief valve (PRV) rated to release at 150 psi, providing a safeguard against over-pressurization in the hot water system. Connections are 3/4-inch threaded, and all components meet lead-free compliance requirements per 1953 standards. Licensed plumbers install this kit as part of routine service access or system protection upgrades on tankless water heater installations.

This kit is designed for residential tankless water heater applications where service isolation is required. The isolation valves allow a technician to shut off water supply to the unit without draining the broader system, simplifying service calls. The included PRV protects the tankless unit from pressure excursions beyond 150 psi. This kit is compatible with Takagi tankless models and is appropriate for both indoor and outdoor-rated installations in that product line.

Key Features

• Lead-free construction for compliance with potable water plumbing codes
• Includes pressure relief valve rated to release at 150 psi
• 3/4-inch threaded connections for standard residential tankless installations
• Isolation valves allow unit service without full system shutdown
• 1953 compliant lead-free designation
• Kit configuration simplifies service-call parts sourcing

Compatibility

Compatible with Takagi tankless water heater models: T-KJr2-IN, T-KJr2-OS, T-K4-IN, T-K4-OS, T-D2-IN, T-D2-OS, T-H2-DV, T-H2-OS, T-H3-DV, T-H3-OS, T-H3S-DV, T-H3S-OS, T-H3J-DV, and T-H3J-OS.

Installation Notes

Installation is performed by a licensed plumber. Shut off the cold water supply and depressurize the system before removing or installing any valves. Apply appropriate thread sealant rated for potable water on all threaded connections. Verify PRV discharge is piped to a safe drain location in accordance with local plumbing codes and the International Plumbing Code (IPC).

Technical Specifications

• Product Type: Isolation Valve Kit with PRV
• Thread Size: 3/4 inches
• Maximum Pressure Relief: 150 psi
• Lead Free: Yes
• Compliance: 1953 Lead-Free Compliant

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112156