Outlet Thermistor, Black

Rheem RTG20006BB Outlet Thermistor – OEM Temperature Sensor for Hot Water Outlet Monitoring

The Rheem RTG20006BB is an original equipment outlet thermistor designed for select Rheem tankless gas water heaters. This thermistor is responsible for monitoring the temperature of the outgoing hot water line, providing real-time temperature data to the control board. Accurate outlet temperature readings are critical for maintaining safe and consistent water delivery, regulating burner output, and ensuring compliance with thermal limit control logic.

System Role and Application

Installed directly at the hot water outlet manifold, the RTG20006BB is used by the system to maintain target setpoints and prevent overheating conditions. It works in coordination with inlet thermistors and flow sensors to enable dynamic burner modulation. A properly functioning outlet thermistor is essential for maintaining unit safety, activating overheat protections, and avoiding diagnostic faults.

Technical Specifications

• Part Number: RTG20006BB
• Sensor Type: NTC thermistor (negative temperature coefficient)
• Location: Hot water outlet sensor position
• Wire Lead: Factory plug-in connector
• Color Code: Black (per Rheem OEM color specification)
• Compatibility: Select Rheem tankless gas water heater models (refer to technical documentation)

Installation Guidelines

Before installation, disconnect electrical power and isolate water supply. The thermistor should be inserted into the designated outlet port and secured according to manufacturer instructions. Ensure proper connection to the system control board using the OEM harness. Do not modify the thermistor housing or wiring, and verify temperature calibration after installation through system diagnostics. This component should be installed by trained technicians familiar with Rheem service procedures.

Service and Field Use

Common service applications include replacement due to error codes related to temperature sensor faults (e.g., high outlet temp or sensor open/short), erratic hot water delivery, or preventative maintenance in high-usage installations. The RTG20006BB is a standard field-replaceable part and should be stocked for responsive service on Rheem tankless systems.