GSW WATER HEATERS 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 listing, the annual figure for this gas tankless unit is 180 therms of natural gas. It applies to the high draw pattern, the standard daily hot-water usage DOE tests against. That is 2 therms below the class median of 182 therms, ranking 165th lowest of 397 models.
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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Find what replaces your water heater
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Find a water heater that fits
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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 GSW WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.94 · Grade B Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.94 for the T-H3J-DV-N 1**. This site did not take the annual figure from the registry. It computed 180 therms from that UEF and the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19, and the fuel is natural gas. The figure applies only to that test draw. Actual use in a home is not in the registry data. Read how the annual cost is calculated for the steps.
Among the 397 models registered as a gas tankless unit at the high draw pattern, this one ranks 165th lowest for energy use. That places it in the second-lowest quarter of its class. The class median is 182 therms, and this model sits 2 therms below it. The data give no spread for the class, so this page cannot say how much 2 therms matters. The high draw pattern describes a larger household, or one where showers and laundry overlap. This unit's maximum flow rate in gallons per minute is 4.7. That is the rated ceiling, and the registry data here do not show the flow a home actually gets. A household with lighter use is tested on a different draw pattern, so this figure does not describe it.
The running cost is not stated here because it depends on the state average residential gas price. Apply your own gas rate to the 180 therms, or use the cost calculator on your own ZIP to do it. The result holds only for the high draw pattern and natural gas. Your rate also sets what the 2 therms gap from the class median is worth. To compare within the same class, find a same-class replacement by model number. The water heater selector narrows options by fuel, space and size. The modeled installed-cost range appears in its own block with its source and date.
DOE CCD · 2026-09-19