Ao Smith 100074370 Bypass Valve Kit Tankless Water Heater

Product Description

The AO SMITH 100074370 is a bypass valve kit designed for tankless water heater service and maintenance. This kit provides the components needed to install or restore a bypass valve assembly, allowing technicians to isolate the unit from the water supply during descaling, flushing, or other routine service procedures. Bypass valve kits are a standard component in professional tankless water heater maintenance programs and are installed by licensed plumbers and HVAC technicians.

This bypass valve kit is intended for use with AO SMITH tankless water heaters in both residential and light commercial applications. It supports annual or as-needed flushing procedures using a descaling pump and solution, which is critical for maintaining heat exchanger efficiency and extending equipment service life in areas with hard water.

Key Features

• Enables cold-water bypass isolation for descaling and flushing procedures
• OEM replacement kit ensuring proper fit and function for designated AO SMITH models
• Compatible with both natural gas and liquid propane model variants
• Supports industry-standard tankless maintenance workflows

Compatibility

Compatible with the following AO SMITH tankless water heater models: T-K3-PRO (NG), T-D2-IN (NG), T-K3 (NG), T-K3-PRO (LP), T-D2-IN (LP), T-D2-OS (NG), T-D2-OS (LP), T-K3 (LP).

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the manufacturer service documentation. Shut off the cold-water supply and relieve system pressure before disassembling any valve connections. Do not apply excessive force to valve fittings, and verify all connections are leak-free before returning the unit to service.

Technical Specifications

• Compatible Fuel Types: Natural Gas, Liquid Propane
• Application: Tankless Water Heater Bypass Valve Service Kit

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100074370