Lennox WHGS030T35NAXS****
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).
If you are verifying this unit, the Lennox WHGS030T35NAXS**** uses 185 therms of natural gas a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 185 therms, a difference of 0 therms, among 288 gas tank 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
- 72 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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Find what replaces your water heater
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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 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 not a registry entry. This site computed it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the medium draw pattern. The Lennox WHGS030T35NAXS**** has a UEF of 0.6, and its fuel is natural gas. The figure holds only for that draw pattern, and the DOE CCD data behind it was retrieved on 2026-09-19. A household that draws more or less hot water than the test assumes will use a different amount, and this page does not estimate it. The calculation is documented in how the annual cost is calculated.
Among the 288 gas tank models registered at the medium draw pattern, this unit has the 89th lowest energy use, in the second-lowest quarter of its class. The class median is 185 therms, and the difference from it is 0 therms, so the model is equal to the median. The figure suits a household whose hot-water use matches the medium draw pattern. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 72 gallons, and the rated volume is 29 gallons. A household with heavier peak-hour demand should compare its own use with that rating. The registry data does not show how the unit performs beyond the test's draw. Sizing by fuel, space and capacity is handled by the water heater selector by fuel, space and size.
The running cost of the Lennox WHGS030T35NAXS**** depends on the state average residential gas price. This text does not state that cost and does not estimate it. The cost calculator on your own ZIP applies your price to the 185 therms shown here, at the medium draw pattern. The installed price range is also not published for this model. Its ratings, a UEF of 0.6, a first hour rating of 72 gallons and a rated volume of 29 gallons, lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare against another gas tank unit, use the same-class replacement finder by model number.
DOE CCD · 2026-09-19