AMERICAN STANDARD WATER HEATERS GSN40T1-3-*
0.6 UEF DOE CCD · 2026-09-19Grade F: where this UEF sits among the 288 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
If you are checking this water heater: the AMERICAN STANDARD WATER HEATERS GSN40T1-3-* uses 185 therms of natural gas a year. This is at the medium draw pattern, the standard daily hot-water usage DOE tests against. That equals the class median of 185 therms, a difference of 0 therms.
Energy use per year
185 therms a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the natural gas rate where you live.
That is equal to the median of 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 89 of 288, lowest energy first.
Solid line: this model (185 therms). Dashed line: the class median.
Min 148 therms Median 185 therms Max 194 therms
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.6 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 74 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 38 gal DOE CCD · 2026-09-19
What it costs to install
$1,410–$2,162 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety record
- Water Heating Technologies recalls American Standard gas water heaters 2016-05-24 Covers some units only: Models beginning GN and GSN sold May 2015 through February 2016; the firm lists exact serial numbers. Check the serial number on your rating plate.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All gas tank water heaters
Gas-fired storage tanks, every size and draw pattern on file.
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Every AMERICAN STANDARD WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.6 · Grade F Price it on your ZIP
The annual figure of 185 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw of the DOE test. This model's UEF is 0.6. The fuel is natural gas, and the source is the DOE CCD, retrieved 2026-09-19. The figure holds only for the medium draw pattern, which suits a typical household with a busy morning peak. Another draw pattern would give a different result. The method is set out on the methodology page.
Among the 288 models registered as a gas tank at the medium draw pattern, this one ranks 89th lowest for energy use. That places it in the second-lowest quarter of its class. Its use equals the class median of 185 therms, so the difference is 0 therms. A household that cares about gas use will find this model neither above nor below the typical unit in its class. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 74 gallons. The rated volume is 38 gallons. Readers comparing sizes can use the water heater selector.
The running cost is not stated here. It depends on the state average residential gas price, so it cannot be read from 185 therms alone. Enter a ZIP in the cost calculator to apply your own rate. The installed-cost range appears in its own block on the page, with its source and date. It is a modeled range, not a quote. The figure of 185 therms does not cover a household with heavier use than the medium draw pattern. For such a household, the annual energy is not available here. To compare units of the same class, use the replacement finder with a model number such as GSN40T1-3-*.
DOE CCD · 2026-09-19