A. O. SMITH GPDNT-50 1**
0.7 UEF DOE CCD · 2026-09-19Grade E: where this UEF sits among the 414 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, high draw pattern (a larger household, or one where showers and laundry overlap).
If you are verifying this model's energy use, A. O. SMITH GPDNT-50 1** uses 242 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 18 therms below the class median of 260 therms among 414 gas tank models.
Energy use per year
242 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 below the median of 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 90 of 414, lowest energy first.
Solid line: this model (242 therms). Dashed line: the class median.
Min 188 therms Median 260 therms Max 277 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
- 0.7 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High 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
- 75 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 48 gal DOE CCD · 2026-09-19
What it costs to install
$2,141–$4,033 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
No CPSC recall names this model.
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 50-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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.7 · Grade E Price it on your ZIP
The figure of 242 therms is not a registry entry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.7 for this model, and from the DOE test's daily hot-water draw for the high draw pattern. It applies to natural gas and to that test draw only. The energy data comes from the DOE CCD, retrieved 2026-09-19. The model has the 90th lowest energy use of 414, which puts it in the lowest quarter of its class, and the gap to the 260 therms median is 18 therms. The methodology page shows how the calculation works.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This model is registered for that pattern, with a first hour rating, the gallons of hot water available in the first hour from a full tank, of 75 gallons and a rated volume of 48 gallons. Those two figures are the ones to compare with your own busiest hour. The registry data does not say how many people that supports. It also does not show whether 242 therms matches a household whose use differs from the test draw. For a different fuel, space or size, the water heater selector filters by those inputs.
The running cost is not stated in the text because it depends on your state's average residential gas price, and this page does not estimate it. Multiplying 242 therms by the price per therm in your area gives a yearly cost at the test draw. The cost calculator does this from your own ZIP. The modeled installed-cost range appears in its own block with its source and date. It is not a quote, and it is not repeated here. If you are checking a like-for-like swap, find a same-class replacement by model number, starting from GPDNT-50 1**.
DOE CCD · 2026-09-19