Ao Smith 100209924 Uln Remote Controller

Product Description

The AO SMITH 100209924 is a ULN remote controller designed for use with AO Smith tankless water heater systems. This control unit allows remote operation and temperature management of compatible tankless water heaters, giving installers and end users a convenient interface without direct access to the heater unit itself. It is a direct OEM-sourced control component intended for replacement or initial installation by licensed plumbers and HVAC technicians working on tankless hot water systems. The part number also cross-references the internal designation TM-RE42 from the supplier documentation.

This remote controller is designed for residential tankless water heater applications. It is compatible with both natural gas and liquid propane AO Smith T-H3 series tankless units in direct vent and outdoor configurations. Typical install scenarios include wall-mounted remote placement at a convenient user location, wired back to the tankless heater unit. Compatible model families include both direct vent and outdoor variants across the T-H3 series lineup.

Key Features

• Remote control interface for AO Smith ULN-series tankless water heaters
• Compatible with both natural gas and liquid propane model variants
• Supports direct vent and outdoor installation configurations
• OEM replacement part for reliable fit and function
• Covers the full T-H3, T-H3M, T-H3S, and T-H3J model subfamilies

Compatibility

Compatible with the following AO Smith tankless water heater models: T-H3-OS (NG), T-H3-OS (LP), T-H3-DV (NG), T-H3-DV (LP), T-H3M-OS (NG), T-H3M-OS (LP), T-H3M-DV (NG), T-H3M-DV (LP), T-H3S-OS (NG), T-H3S-OS (LP), T-H3S-DV (NG), T-H3S-DV (LP), T-H3J-OS (NG), T-H3J-OS (LP), T-H3J-DV (NG), and T-H3J-DV (LP).

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician familiar with tankless water heater controls. Power to the tankless unit must be disconnected before removing or connecting the remote controller wiring. Follow the heater manufacturer wiring diagram for correct low-voltage connections between the remote and the unit. Local codes and the manufacturer installation manual should be consulted before beginning work.

Technical Specifications

• Product Type: Control
• Internal Reference: TM-RE42

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100209924