Rheem rtg20006uw Ambient Thermistor Tankless Water Heater

Product Description

The RHEEM rtg20006uw is an OEM ambient thermistor designed for select Rheem tankless gas water heaters. This sensor monitors ambient air temperature around the unit and feeds that data to the control board. The control system uses the input to manage combustion logic, freeze protection routines, and operational safety checks. It is a direct factory replacement component, blue in color, and sized for straightforward access during service. Plumbing and HVAC technicians servicing Rheem tankless equipment will recognize this as the standard ambient sensing element for affected units.

This thermistor is intended for residential tankless gas water heater applications where ambient temperature monitoring is required for accurate system control. It supports system logic under varying environmental conditions, including cold-climate installations where freeze protection activation depends on reliable ambient temperature input. Installation is typically performed by licensed plumbers or water heater service technicians during diagnostic replacement or routine component service.

Key Features

• OEM Rheem replacement thermistor — direct fit for compatible tankless gas water heater models
• Monitors ambient air temperature to support combustion control and freeze protection logic
• Blue color coding aids identification during installation and service
• Compact form factor at 3.1 inches long, 2.7 inches wide, and 2.1 inches tall
• Lightweight at 0.2 pounds — minimal handling effort during confined-space service

Compatibility

Designed as an OEM-style replacement ambient thermistor for select Rheem tankless gas water heater units. Refer to the unit service manual or Rheem parts documentation to confirm fitment for the specific model being serviced.

Installation Notes

Installation should be performed by a licensed plumber or qualified water heater service technician. Before servicing, shut off the gas supply and disconnect power to the unit per the manufacturer service manual and applicable local codes. Handle the thermistor leads carefully to avoid damaging the sensor element or connector. Verify sensor seating and connector lock engagement before restoring power and gas.