A. O. SMITH T-H3J-DV-N 1**
0.94 UEF DOE CCD · 2026-09-19Grade B: where this UEF sits among the 397 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tankless unit, high draw pattern (a larger household, or one where showers and laundry overlap).
If you are verifying this A. O. SMITH T-H3J-DV-N 1**, it uses 180 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 2 therms below the class median of 182 therms among 397 gas tankless models at the same pattern.
Energy use per year
180 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 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 165 of 397, lowest energy first.
Solid line: this model (180 therms). Dashed line: the class median.
Min 173 therms Median 182 therms Max 209 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
- 0.94 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tankless unit at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 4.7 gal/min DOE CCD · 2026-09-19
What it costs to install
$2,311–$3,350 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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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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How to size a tankless water heater by GPM
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 tankless water heaters
Gas-fired instantaneous units, sized by flow rate rather than tank gallons.
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Every A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.94 · Grade B Price it on your ZIP
The registry lists this unit at a UEF, the ratio of hot water delivered to energy used, of 0.94. This site combined that UEF with the DOE test's daily hot-water draw for the high draw pattern. The result is 180 therms of natural gas per year. The registry does not publish that annual figure itself. The data comes from DOE CCD, retrieved 2026-09-19. Among the 397 models registered as a gas tankless unit at the high draw pattern, this one has the 165th lowest energy use. It sits 2 therms below the class median of 182 therms, which puts it in the second-lowest quarter of its class for energy use.
The high draw pattern describes a larger household, or one where showers and laundry overlap. If that matches your home, the 180 therms figure is the relevant one for this unit. The registered maximum flow rate in gallons per minute is 4.7, which is the most water the unit is listed to heat each minute. A household with a smaller daily draw does not fit this figure, and this page has no annual energy value for other draw patterns. The rank of 165th lowest of 397 applies only to the high draw pattern and should not be read across to any other. To compare by fuel, space and size, use the water heater selector by fuel, space and size, or find a same-class replacement by model number.
Running cost is not stated here because it depends on your state's average residential gas price. The cost calculator on your own ZIP applies that price to the 180 therms at the high draw pattern. The method behind the annual cost is documented separately. The installed price range appears in its own block on this page, with its source and date, as a modeled installed-cost range and not a quote. Two limits apply. The annual energy is a calculation from the registry's UEF of 0.94 and the test draw, not a measurement in any home. Energy use in a home with a different draw is not available from this data.
DOE CCD · 2026-09-19