Nibco H-42443WPR-LF 3/4 Fip Tankless Water Heater Kit

Product Description

The NIBCO H-42443WPR-LF is a lead-free expansion tankless water heater service valve kit designed for isolating tankless water heater installations in residential and commercial plumbing systems. The kit includes a pressure reducing valve (PRV) and is configured with 3/4-inch female iron pipe (FIP) connections. It reduces the number of leak paths compared to assembling individual components, supporting faster and more consistent installations. Plumbers and pipefitters working on tankless water heater retrofits or new installs will find this kit suited for applications where code or jobsite conditions require a lead-free assembly.

This kit is intended for use in residential and commercial plumbing and heating systems. It is compatible with water, oil, and glycol-mix service. The expansion design accommodates the thermal expansion common in closed-loop or backflow-protected supply systems paired with tankless water heaters. The integrated PRV simplifies the service valve assembly by consolidating isolation and pressure regulation into a single kit, reducing total fitting count at the heater connections.

Key Features

• Lead-free construction meets low-lead compliance requirements for potable water installations
• 3/4-inch FIP connections on both service ports
• Includes pressure reducing valve (PRV) for integrated pressure management
• Expansion-style design addresses thermal expansion in closed plumbing systems
• Fewer leak paths compared to field-assembled individual valve components
• Suitable for water, oil, and glycol-mix service in heating and plumbing applications

Compatibility

Designed as an OEM-style replacement and new-installation service valve kit for residential and commercial tankless water heater systems requiring 3/4-inch FIP connections and lead-free compliance.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the International Plumbing Code (IPC). Shut off the cold water supply and relieve system pressure before beginning installation or service. Ensure all connections are properly sealed with appropriate thread sealant rated for the intended service fluid. Verify that the PRV is set to the correct downstream pressure for the tankless water heater manufacturer's requirements before returning the system to service.

Technical Specifications

• Connection Size: 3/4 inches
• Connection Type: Female Iron Pipe (FIP)
• Lead-Free: Yes
• Service Media: Water, oil, glycol mix
• Application: Residential and commercial plumbing and heating systems
• UPC: 018394020221

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: H-42443WPR-LF