Rinnai Sensei CX199iN Commercial Tankless Water Heater
- 199,000 BTU condensing commercial tankless
- Natural gas or propane, Smart Sense, no conversion kit
- 97% thermal efficiency, UEF .98
- Indoor or outdoor with Versa Vent, cap sold separately
- Quick Flush and Smart-Circ recirculation
- 8-year heat exchanger warranty, 5-year parts, 1-year labor
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A commercial condensing tankless water heater that runs on natural gas or propane without a conversion kit. Flow rate and dimensions are not given, and the recirculation pump is described inconsistently.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0CM4K13DGModel: CX199iNCategory: Water Heaters
Overview
Rinnai designed the CX199iN for commercial hot water demand, from restaurants to multifamily buildings. A condensing heat exchanger and a Smart Sense gas valve let it run on either fuel, and a Versa-Vent cap adapts it to outdoor use.
On-demand hot water in a compact body, with a gas valve that adapts to the fuel and a flush feature, is the reason to look. The open points are missing sizing data and a recirculation pump described as both built in and optional.
Who it's for
Commercial installers and building managers replacing tank systems with a condensing tankless unit get fuel flexibility and a quick flush function. Homeowners and DIY installers should note that the maker recommends professional installation.
Pros and cons
- Runs on natural gas or propane
- Condensing high-efficiency design
- Indoor or outdoor installation
- Quick Flush for maintenance
- Flow rate and dimensions not given
- Recirculation pump status unclear
- Professional installation recommended
Performance notes
Condensing recovers extra heat from exhaust gas, which is how the efficiency rating gets so high. Smart Sense adjusts the gas valve to the fuel supplied, and Smart-Circ learns usage patterns to schedule recirculation, though the pump is the point the text contradicts. Quick Flush simplifies flushing.
Specifications
| Brand | Rinnai |
|---|---|
| Model | CX199iN |
| Capacity & performance | |
| Heat Output | 199,000 BTU |
| Power & efficiency | |
| Power Source | Natural gas or propane |
| Thermal efficiency | 97% |
| Efficiency | UEF .98 |
| Compatibility & installation | |
| Installation | Indoor or outdoor with Versa Vent |
| Warranty & support | |
| Heat exchanger warranty | 8 years or 12,000 hours |
| Parts warranty | 5 years |
| Labor warranty | 1 year |
| Other details | |
| Maintenance | Quick Flush |
| Recirculation | Smart-Circ, pump kit optional |
Frequently asked questions
How do I flush the Rinnai CX199iN?
The Quick Flush feature simplifies flushing, though the listing gives no steps. The Rinnai Central App is named for setup, service and troubleshooting help.
Does the Rinnai CX199iN need a gas conversion kit?
No. The Smart Sense gas valve adjusts to natural gas or propane, so no conversion kit is needed according to the description.
Is the recirculation pump included?
The bullets mention an internal pump, while the description lists an optional internal pump kit sold separately. Confirm with the seller.
Can I install the CX199iN myself?
Rinnai recommends professional installation and points to its Find a Rinnai PRO page.