Lennox WHGS040T40*PXS****
0.7 UEF DOE CCD · 2026-09-19Grade E: where this UEF sits among the 414 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, high draw pattern (a larger household, or one where showers and laundry overlap).
If you are checking the Lennox WHGS040T40*PXS****, it is a gas tank model that uses 242 therms of natural gas a year. That figure applies to the high draw pattern, the standard daily hot-water usage DOE tests against. It sits 18 therms below the 260 therms median of the 414 gas tank models registered at that pattern.
Energy use per year
242 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 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 90 of 414, lowest energy first.
Solid line: this model (242 therms). Dashed line: the class median.
Min 188 therms Median 260 therms Max 277 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
- 0.7 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High 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
- 78 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 38 gal DOE CCD · 2026-09-19
What it costs to install
$1,993–$3,665 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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Is a 40-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 0.7 · Grade E Price it on your ZIP
This site calculated the 242 therms figure. It does not come from the registry. 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 high draw pattern. For this model the UEF is 0.7. The figure holds only at that test draw. A household that uses more or less hot water will have a different total. Within its class, the model ranks 90th lowest energy use of 414, which puts it in the lowest quarter of gas tank models at the high draw pattern. The registry data comes from the DOE CCD and was retrieved on 2026-09-19. Energy use under other draw patterns is not available here. The steps are set out in how this site calculates annual energy and cost.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 78 gallons. Its rated volume is 38 gallons. A household whose busiest hour needs more than 78 gallons would draw beyond this rating. The data does not show how the model performs in that case. A smaller household with lighter daily use does not fit the high draw pattern either. The 242 therms figure was not measured for that kind of use. To compare other fuels or tank sizes, use the water heater selector by fuel, space and size. To match this unit within its own class, try finding a same-class replacement by model number.
This text does not state the running cost. It depends on your state's average residential natural gas price, so the page calculates it from your ZIP. The calculation uses the same 242 therms a year at the high draw pattern. The 18 therms gap to the class median of 260 therms also applies to cost. How much that gap is worth depends on your own gas price. To check another rate or address, use the cost calculator for your own ZIP. The installed price range appears in its own block, with its source and date. It is a modeled range for installed cost, not a quote, and this page does not repeat its figures.
DOE CCD · 2026-09-19