Rinnai RE Series with Smart-Circ 6.6 GPM Indoor NCTWH with Recirculation and Pump, NG

Rinnai RE Series with Smart-Circ 6.6 GPM Indoor NCTWH with Recirculation and Pump, NG

The Rinnai RE Series with Smart-Circ 6.6 GPM Indoor NCTWH (Natural Gas Tankless Water Heater) is a high-efficiency water heating system that provides an endless hot water supply on demand. It features a compact design that can be installed in various locations, including inside a home or business.

One of the critical features of this water heater is the Smart-Circ technology, which helps to improve the overall efficiency of the system by recirculating hot water through the pipes to reduce standby losses. This helps save energy and reduces the wait time for hot water at the tap.

In addition to the Smart-Circ  technology, this water heater also comes with a recirculation pump and a built-in temperature control system to ensure the water is always at the desired temperature. It has a maximum flow rate of 6.6 gallons per minute, making it capable of simultaneously supplying hot water to multiple faucets or appliances.

The Rinnai RE Series with Smart-Circ 6.6 GPM Indoor NCTWH is fueled by natural gas and has a maximum input of 199,000 BTUs per hour. It is suitable for use in homes or businesses with high hot water demand and is compatible with standard residential plumbing systems.

Features

• Smart-Circ Intelligent Recirculation

• Clean Internal Layout

• LED Screen

• New Sliding Wall Bracket

• Safety Handle and Seating Bracket

• Built-In Recirculation Control

• Recirculation-Ready Models include Built-In Pump

• Wall Mounting Bracket

• Easy Open / Close Access

• Programmable Service Reminders

• Compact Copper Heat Exchanger

• Valve Kit

• Optional Leak Detection Kit

• Optional Freeze Protection

• 160,000 BTUs

• Hot Water Capacity Range:  0.26 GPM to 6.6 GPM

• 0.81 Uniform Energy Factor

• Dimensions:  14.05" x 22.87" x 10.77"

Specification

What Our Experts Think

• Smart-Circ Recirculation: Built-in pump delivers hot water faster to fixtures, reducing wait time and water waste.

• 6.6 GPM Flow Rate: Ideal for small to medium homes with multiple hot-water fixtures.

• Natural Gas Powered: Provides efficient, cost-effective performance.

• Tankless Indoor Design: Heats water only when needed and saves valuable indoor space.

Q&A

Q: What is Smart-Circ technology?
A: It uses a built-in recirculation pump to learn your usage patterns and deliver hot water faster when you need it.

Q: How much hot water can it provide?
A: Up to 6.6 gallons per minute, suitable for multiple fixtures running simultaneously.

Q: Does it need to be vented?
A: Yes — this model is for indoor installation and requires proper venting according to manufacturer specifications.

Maintenance Tips

• Flush annually to remove scale buildup and maintain recirculation performance.

• Inspect gas, water, and pump connections regularly for leaks or wear.

• Clean vent and air inlets periodically to ensure proper airflow.

• Follow manufacturer service guidelines to ensure long-term reliability.