What it delivers
The Rinnai RX199iN Condensing Tankless Water Heater is a condensing gas tankless with a 199,000 BTU/h burner and a stated maximum flow of 11.0 GPM.
At a 45°F rise (mild inlet water to a 120°F set point) it holds about 8.4 GPM, 4 showers at 2 GPM; in winter, at a 70°F rise, about 5.4 GPM, 2 showers at 2 GPM. Check it against your own fixtures.
Gas load at full fire: about 2.2 gallons of propane an hour. An older half-inch line that already feeds a furnace often can't spare that, so have a gas fitter check the pipe size and run.
As a condensing unit it vents in the plastic pipe (PVC, CPVC or polypropylene) its manual lists and drains an acidic condensate, usually through a neutralizer.
From the listing: features: Smart Sense gas control system, Versa Vent; connectivity: WiFi; material: Copper, Metal, Stainless Steel; model: RX199iN; warranty: 5 Year Labor, 5 Year Parts.
The listing gives dimensions of 18.5 in (W) x 30.11 in (H) and a weight of 55 lb.
Warranty, per the listing: 5 Year Labor, 5 Year Parts.
Right unit for this house?
Install it when
- Houses running 2 showers at once in winter
- Propane homes
- Replacing a gas tank heater
Look at another unit when
- More than 2 winter showers at once
- Homes without a gas line
Strengths and trade-offs
Strengths
- 199,000 BTU/h input
- Up to 11.0 GPM
- Condensing efficiency
Trade-offs
- Gas line may need upsizing
- Needs a condensate drain
- Scale builds up without flushing
Install limits
- Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.
Rated performance
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Model number | RX199iN | Retailer |
|---|---|---|
| Dimensions (seller) | 18.5"W x 30.11"H | Retailer |
| Features (seller) | Smart Sense gas control system, Versa Vent | Retailer |
| Voltage | 120 V | Retailer |
| Max flow (maker) | 11 GPM | Retailer |
| Input (maker) | 199,000 BTU/h | Retailer |
| Product weight | 55 lb | Retailer |
| Warranty | 5 Year Labor, 5 Year Parts | Retailer |
| Material | Copper, Metal, Stainless Steel | Retailer |
| Fuel | propane | Retailer |
| Condensing | condensing | Retailer |
| Connectivity | WiFi | Retailer |
Rival units at this flow
More gas tankless water heaters rated for similar demand
- Ranein RH12KG-C-NG 120,000 BTU Natural Gas Condensing Tankless Water Heater
- ThermoMate CZ480NG Natural Gas Condensing Tankless Water Heater
- Rheem RTGH-84DVLN-3 157,000 BTU Natural Gas Condensing Tankless Water Heater
- Rinnai RX130iN Condensing Tankless Water Heater
Full gas tankless water heaters spec grid · Every Rinnai unit in the catalog
Final verdict
A solid condensing gas tankless for houses running 2 showers at once in winter.
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