Rinnai CU160iN Commercial Natural Gas Condensing Tankless Water Heater

In this review of the Rinnai CU160iN commercial tankless water heater, the bottom line is simple: this unit is aimed at businesses that need a reliable, compact source of continuous hot water and want to reduce standby energy loss. Installers and facility managers will appreciate the combination of a high-performance 9 GPM flow rate and a condensing design that focuses on efficiency. The review finds the CU160iN best for commercial sites where steady demand and installation flexibility matter, and where a qualified technician will perform a professional installation.

Key Features

• Energy efficient condensing: The condensing design captures additional heat from exhaust gases so the heater uses less fuel over time and lowers operating costs.
• High hot water flow: The 9 GPM rating provides a powerful and consistent stream suitable for busy kitchens, showers, or multi-sink applications.
• Circ-Logic recirculation: Built-in recirculation patterns align with regular usage to reduce waiting time and water waste when combined with recirculation loops.
• Installation flexibility: Multiple venting options make indoor installation adaptable to different commercial layouts and existing vent routes.
• Wi-Fi monitoring: Remote monitoring gives service teams visibility and helps deliver hot water on demand while supporting preventive maintenance.
• Commercial warranty: Layered coverage (heat exchanger, parts, labor) offers multi-year protection for business use.

Who It's For

The CU160iN is best for restaurants, apartment common areas, small laundries, schools, and other commercial settings that require sustained hot water flow without a bulky storage tank. Facilities with recurring peaks in demand will benefit from the unit's 9 GPM capacity and recirculation features.

It is not intended for do-it-yourself installation; Rinnai recommends professional installation, so operations without access to certified technicians or with extremely low upfront budgets should consider other options. Sites needing elaborate multi-unit cascade setups should consult a pro to verify system sizing.

Pros & Cons

Pros

• High 9 GPM output supplies continuous hot water for demanding commercial use.
• Condensing technology improves fuel efficiency and lowers operating costs.
• Circ-Logic and Wi-Fi monitoring support responsive recirculation and remote oversight.
• Multiple venting options allow flexible indoor installations.

Cons

• Professional installation is required, adding to initial cost and scheduling complexity.
• As a commercial unit, it may be overbuilt for very small single-residence needs.

Specifications

Model	CU160iN
Fuel Type	Natural gas
Installation	Indoor
Flow Rate	9 GPM
Design	Condensing tankless
Warranty (commercial)	8-, 5-, and 1-year for heat exchanger, parts, labor

Our Verdict

The Rinnai CU160iN is a solid commercial tankless choice for businesses that need reliable, high-flow hot water and value improved efficiency from condensing technology. With smart recirculation and remote monitoring, it delivers good long-term value when installed by a qualified technician, though upfront installation costs should be planned for.

Frequently Asked Questions

Can this unit be installed indoors?
Yes, the CU160iN is designed for indoor installation and offers multiple venting options to suit different building layouts.

Is professional installation required?
Rinnai recommends professional installation; locating a Rinnai PRO technician ensures correct venting, gas supply, and warranty compliance.

What warranty coverage comes with the unit?
The commercial warranty provides 8 years on the heat exchanger, 5 years on parts, and 1 year on labor.