Lennox WHGS050T40NAXS****
0.65 UEF DOE CCD · 2026-09-19Grade G: 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 WHGS050T40NAXS****, this gas tank water heater uses 260 therms of natural gas a year. That figure applies at the high draw pattern, the standard daily hot-water usage DOE tests against. It is equal to the 260 therms median of the 414 gas tank models registered at that draw pattern.
Energy use per year
260 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 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 204 of 414, lowest energy first.
Solid line: this model (260 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
- 0.65 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
- 86 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 47 gal DOE CCD · 2026-09-19
What it costs to install
$1,834–$3,245 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
-
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.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Is a 50-gallon water heater enough?
Answered from what models in this size actually file.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
All gas tank water heaters
Gas-fired storage tanks, every size and draw pattern on file.
-
Every Lennox model on file
What this brand files, by heater type.
UEF 0.65 · Grade G Price it on your ZIP
The 260 therms figure comes from this site's calculation. The registry does not publish 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 high pattern. For this model the UEF is 0.65. The registry data comes from the DOE CCD and was retrieved on 2026-09-19. The high pattern stands for a larger household, or one where showers and laundry overlap. If your home draws a different amount of hot water than that test day, your actual gas use will differ from 260 therms. The registry does not say by how much. The steps behind the figure are set out in how the annual energy and cost figures are calculated.
Among the 414 gas tank models at the high draw pattern, this unit ranks 204th lowest in energy use. That places it in the second-lowest quarter of its class. Its difference from the 260 therms class median is 0 therms. A plumber or homeowner checking a quote can read its energy use as equal to the class median, neither above nor below it. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 86 gallons. Its rated volume is 47 gallons. Those two figures and the high draw pattern describe the household the test assumes. To check other registered units in the same class, use find a same-class replacement by model number.
This text does not state the running cost. It depends on your state's average residential gas price. The page calculates it from your ZIP, using the 260 therms figure at the high draw pattern. You can check that result with the water heater cost calculator for your ZIP. A smaller household than the high pattern assumes is not described by the 260 therms figure. This page has no energy figure for this model at a lower draw pattern, so that value is not available. For units rated for other household sizes, the selector by fuel, space and size lists registered options. The installed price range appears in its own block on this page. It is a modeled range, not a quote, and it shows its own source and date.
DOE CCD · 2026-09-19