GSW WATER HEATERS T-H3-DV-N 1**
0.93 UEF DOE CCD · 2026-09-19Grade C: 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 the GSW WATER HEATERS T-H3-DV-N 1**, it uses 182 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 0 therms from the class median of 182 therms across 397 models, so it sits at the median.
Energy use per year
182 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 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 183 of 397, lowest energy first.
Solid line: this model (182 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
- 0.93 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
- 5.8 gal/min DOE CCD · 2026-09-19
What it costs to install
$2,264–$3,294 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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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 0.93 · Grade C Price it on your ZIP
The figure of 182 therms is computed by this site, not published by the registry. It multiplies the registry's UEF, the ratio of hot water delivered to energy used, of 0.93 by the DOE test's daily hot-water draw for the high draw pattern. The registry entry was retrieved from the DOE CCD on 2026-09-19. The result applies to natural gas at that test draw only. A household that uses more or less hot water than the test assumes will use a different amount of gas. The calculation steps are described in how the annual cost is calculated. The registry also lists a maximum flow rate in gallons per minute of 5.8 for this model. That value describes peak flow and is not an input to the annual figure.
Among the 397 models registered as a gas tankless unit at the high draw pattern, this model ranks 183rd lowest for energy use. That places it in the second-lowest quarter of its class. Its 182 therms equals the class median of 182 therms, a difference of 0 therms. The high draw pattern describes a larger household, or one where showers and laundry overlap, so the figure is most relevant to that kind of use. A household with lighter hot-water use does not match the test draw behind 182 therms. The energy figure for a lower draw pattern is not available on this page. The rank compares energy use at the test draw only. It does not cover other measures, and none are given here for this model.
The running cost is not stated in the text, because it depends on your state's average residential gas price. Applying that price to 182 therms gives the yearly gas cost for this model at the high draw pattern. The cost calculator does this from your own ZIP. The modeled installed-cost range appears in its own block on the page with its source and date. It is a modeled range, not a quote, and it is not repeated here. To check a same-class alternative against the class median of 182 therms, use the replacement finder by model number. Both tools use the same registry basis described above.
DOE CCD · 2026-09-19