AMERICAN STANDARD WATER HEATERS GN40L2-3-*
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's energy figure, here it is. Model GN40L2-3-* uses 185 therms of natural gas a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 185 therms among 288 gas tank models.
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
- 62 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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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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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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Is a 40-gallon water heater enough?
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 registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this AMERICAN STANDARD WATER HEATERS model. The registry does not list annual energy use. This site computed the 185 therms figure from that UEF and the DOE test's daily hot-water draw. The draw belongs to the medium draw pattern, so the figure applies only to a typical family household on a busy morning. The fuel is natural gas, and the source is DOE CCD, retrieved 2026-09-19. A household that uses more or less hot water than the test assumes will see a different figure.
Against the 288 models registered as a gas tank at the medium draw pattern, this one ranks 89th lowest in energy use. That is the second-lowest quarter of its class. The difference from the median of 185 therms is 0 therms, so its use equals the class median. The model suits a household whose hot-water use matches the medium pattern. Peak demand is the other check. The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 62 gallons. The rated volume is 38 gallons. You can find a same-class replacement by model number to compare other units.
The running cost is not stated in the text. It depends on your state's average residential gas price, so this page cannot give one figure. To get it, multiply 185 therms by that price. You can do this for your own ZIP with the cost calculator. The method for the annual cost explains each step. Any result assumes the medium draw pattern, so a household with different use will pay a different amount. The installed price range is shown in its own block, as a modeled range and not a quote. Whether the unit's real-world use matches the test is unknown from registry data.
DOE CCD · 2026-09-19