What it delivers
The Westinghouse HS180A0G-NG 180,000 BTU Outdoor Tankless Water Heater is an outdoor gas tankless with a 180,000 BTU/h burner and a stated maximum flow of 8.1 GPM.
Worked out from its input, it delivers roughly 6.2 GPM when the water only has to rise 45°F, and 4.0 GPM at a 70°F winter rise: 3 showers at 2 GPM in summer, 1 shower at 2 GPM in winter. Check it against your own fixtures.
Gas load at full fire: about 174 cubic feet of natural gas 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 an outdoor model it mounts on an exterior wall and needs no vent pipe; in freezing climates check the maker's freeze protection and cover the connections.
The listing describes its venting as: outdoor installation.
Other listed details: connections: 3/4" npt; model: HS180A0G-NG.
The listing gives dimensions of 17.1 in (W) x 26.8 in (H) and a weight of 42 lb.
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
- 180,000 BTU/h input
- Up to 8.1 GPM
- No vent pipe
Trade-offs
- Gas pipe sizing to confirm
- Needs freeze protection outdoors
- 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 | HS180A0G-NG | Retailer |
|---|---|---|
| Dimensions (seller) | 17.1"W x 26.8"H | Retailer |
| Voltage | 120 V | Retailer |
| Max flow (maker) | 8.1 GPM | Retailer |
| Input (maker) | 180,000 BTU/h | Retailer |
| Product weight | 42 lb | Retailer |
| Fuel | natural gas | Retailer |
| Venting | outdoor installation | Retailer |
| Connections | 3/4" npt | Retailer |
Rival units at this flow
More gas tankless water heaters rated for similar demand
- Noritz NR50ODLP Propane Outdoor Tankless Water Heater
- Noritz NR66ODNG Natural Gas Outdoor Tankless Water Heater
- Rheem RTG-95XLN-3 199,900 BTU Natural Gas Outdoor Tankless Water Heater
- Rheem RTGH-95DVLP-3 199,900 BTU Propane Tankless Water Heater
Full gas tankless water heaters spec grid · Every Westinghouse unit in the catalog
Final verdict
A sensible outdoor gas tankless for one shower at a time in cold climates.
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