LOCHINVAR G6-US4040NV 5**
0.64 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 verifying the LOCHINVAR G6-US4040NV 5** gas tank, its annual use depends on the draw pattern, the standard daily hot-water usage DOE tests against. At the high draw pattern it uses 264 therms of natural gas a year, 4 therms above its class median of 260 therms.
Energy use per year
264 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 above the median of 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 236 of 414, lowest energy first.
Solid line: this model (264 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
- 0.64 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
- 83 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
$1,643–$2,763 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 LOCHINVAR model on file
What this brand files, by heater type.
UEF 0.64 · Grade G Price it on your ZIP
The 264 therms figure is computed by this site, not published in the federal registry itself. It pairs the UEF, the ratio of hot water delivered to energy used, with the DOE test's daily draw for this pattern. The registry lists this model's UEF as 0.64, from the DOE Compliance Certification Database (CCD) retrieved on 2026-09-19. Among the 414 models registered as a gas tank at the high draw pattern, it ranks 236th lowest in energy use. That rank places it in the second-highest quarter of its class for energy use, above the class median. The figure holds only at the test's daily draw; this page has no energy figure for other household draws.
In plain terms, the high draw pattern represents 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 83 gallons. Its rated tank volume is 38 gallons, which is the figure listed in the registry. A household whose peak-hour hot-water need stays within 83 gallons sits inside what that rating describes. For a smaller household, a lower draw pattern applies, and the 236th rank against 414 high-pattern models would not carry over. To see models at other patterns, use the selector by fuel, space and size on this site. To check a unit in the same class, you can find a same-class replacement by model number from this listing.
The yearly running cost of this model's 264 therms at the high draw pattern depends on your state's average residential gas price. For that reason this text states no cost figure; the page computes it from your ZIP code instead. You can run the same figure for another location with the cost calculator on your own ZIP for water heaters. The steps from UEF to annual energy to cost are set out in how the annual cost is calculated. At any single gas rate, the 4 therms gap above the class median carries through to a higher cost than the median model's. The installed price range shown on this page is a modeled installed-cost range with its own source and date, not a quote.
DOE CCD · 2026-09-19