Lennox WHGS030T35NANS****
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).
Checking this unit's energy use? The Lennox WHGS030T35NANS****, a gas tank heater, uses 185 therms of natural gas a year. That figure belongs to the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 0 therms from the class median of 185 therms across 288 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
- 70 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 29 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety 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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Is a 30-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 Lennox model on file
What this brand files, by heater type.
UEF 0.6 · Grade F Price it on your ZIP
The figure of 185 therms is computed by this site, not published by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.6 for this model. The site pairs it with the daily hot-water draw of the DOE test. The condition is the medium draw pattern, with natural gas as the fuel. The source is the DOE CCD, retrieved 2026-09-19. A household that draws more or less hot water than the test will use a different amount. The method behind the annual figure is described on a separate page.
Among the 288 models registered as a gas tank at the medium draw pattern, this model ranks 89th lowest for energy use. Its 185 therms equals the class median of 185 therms, a difference of 0 therms. That places it in the second-lowest quarter of its class. The position covers energy use at the test draw only. The registry gives a first hour rating, the gallons of hot water available in the first hour from a full tank. For this model it is 70 gallons, and the rated volume is 29 gallons. The unit suits a household whose use resembles the medium draw pattern. A household that needs more hot water in the first hour than 70 gallons falls outside what this rating shows.
Running cost depends on the state average residential gas price, so no cost is written on this page. The cost calculator applies that price from your own ZIP to the 185 therms shown above. This site does not estimate a cost itself, because the 185 therms figure is valid only for the medium draw pattern. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare a same-class unit, find a replacement by model number starting from WHGS030T35NANS****. Other listings are under all water heater pages.
DOE CCD · 2026-09-19