What it delivers
The Rinnai RE140iN Natural Gas Tankless Water Heater is a non-condensing gas tankless with a 140,000 BTU/h burner and a stated maximum flow of 5.3 GPM.
Worked out from its input, it delivers roughly 4.8 GPM when the water only has to rise 45°F, and 3.1 GPM at a 70°F winter rise: 2 showers at 2 GPM in summer, 1 shower at 2 GPM in winter. Run your house through the planner.
The line must deliver about 135 cubic feet of natural gas an hour when it fires flat out. The requirement calculator adds it up; a licensed fitter confirms the pipe.
Non-condensing indoor units run hot exhaust and vent in the maker's listed vent system (often stainless Category III), which costs more than plastic.
Other listed details: features: LED Display; connectivity: WiFi; model: RE140iN; warranty: 1 Year Labor, 5 Year Parts.
The listing gives dimensions of 14.05 in (W) x 27.28 in (H) and a weight of 23.02 kg.
Warranty, per the listing: 1 Year Labor, 5 Year Parts.
Right unit for this house?
Install it when
- One shower at a time in cold climates
- Replacing a gas tank heater
Look at another unit when
- More than 1 winter shower at once
- Homes without a gas line
Strengths and trade-offs
Strengths
- 140,000 BTU/h input
- Up to 5.3 GPM
Trade-offs
- Gas pipe sizing to confirm
- Stainless venting costs more
- Annual flushing on hard water
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 | RE140iN | Retailer |
|---|---|---|
| Dimensions (seller) | 14.05"W x 27.28"H | Retailer |
| Features (seller) | LED Display | Retailer |
| Voltage | 120 V | Retailer |
| Max flow (maker) | 5.3 GPM | Retailer |
| Input (maker) | 140,000 BTU/h | Retailer |
| Product weight | 23.02 kg | Retailer |
| Warranty | 1 Year Labor, 5 Year Parts | Retailer |
| Fuel | Natural Gas | Retailer |
| Condensing | non-condensing | Retailer |
| Connectivity | WiFi | Retailer |
Rival units at this flow
More gas tankless water heaters rated for similar demand
- Rinnai RE180eN Natural Gas Tankless Water Heater
- Rinnai RE180iN Natural Gas Tankless Water Heater
- SNDOAS IF.JSQ25-B13NA Natural Gas Tankless Water Heater
- VEVOR JSQ30-A 100,000 BTU Tankless Water Heater
Full gas tankless water heaters spec grid · Every Rinnai unit in the catalog
Final verdict
A sensible non-condensing gas tankless for one shower at a time in cold climates.
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