What it delivers
The SNDOAS IF.JSQ25-B13NA Natural Gas Tankless Water Heater is a non-condensing gas tankless with a 85,300 BTU/h burner and a stated maximum flow of 4.2 GPM.
At a 45°F rise (mild inlet water to a 120°F set point) it holds about 2.9 GPM, 1 shower at 2 GPM; in winter, at a 70°F rise, about 1.9 GPM, less than one 2 GPM shower. Check it against your own fixtures.
The line must deliver about 82 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.
From the listing: features: LED Display; connections: 1/2" npt; model: IF.JSQ25-B13NA.
The listing gives dimensions of 13.8 in (W) x 21.6 in (H) and touch control in the box.
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
- 85,300 BTU/h input
- Up to 4.2 GPM
Trade-offs
- Gas pipe sizing to confirm
- Stainless venting costs more
- Needs periodic descaling
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 | IF.JSQ25-B13NA | Retailer |
|---|---|---|
| Dimensions (seller) | 13.8"W x 21.6"H | Retailer |
| Features (seller) | LED Display | Retailer |
| Voltage | 120 V | Retailer |
| Max flow (maker) | 4.23 GPM | Retailer |
| Input (maker) | 85,300 BTU/h | Retailer |
| Fuel | natural gas | Retailer |
| Connections | 1/2" npt | Retailer |
Rival units at this flow
More gas tankless water heaters rated for similar demand
Final verdict
A solid non-condensing gas tankless for one shower at a time in cold climates.
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