LOCHINVAR GDV-40 3**
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).
For a check against the registry, LOCHINVAR GDV-40 3** 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 its 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
- 64 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 39 gal DOE CCD · 2026-09-19
What it costs to install
$1,424–$2,199 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 0.6 · Grade F Price it on your ZIP
The annual figure of 185 therms is computed by this site, not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 0.6 for this model, with the daily hot-water draw the federal test assigns to the medium draw pattern. The source data is the DOE CCD, retrieved 2026-09-19. The figure is natural gas use for a 39-gallon gas tank under that test draw only. A household that draws more or less hot water than the test will use a different amount, and this page does not estimate it. The calculation method is documented separately.
Among the 288 models registered as a gas tank at the medium draw pattern, this unit ranks 89th lowest for energy use, in the second-lowest quarter of its class. Its 185 therms equals the class median of 185 therms, so the difference is 0 therms. Energy use at the class median suits a reader who wants a unit that neither saves nor spends more gas than the typical model under the test draw. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 64 gallons. A household whose busiest hour needs more hot water than that is not served by this rating. The water heater selector filters by fuel, space and size.
The running cost is not written in this text because it depends on your state average residential gas price, which is not in the data here. The cost calculator takes your ZIP and applies that price to 185 therms. Because the figure is tied to the medium draw pattern, the result holds only at that test draw. The modeled installed-cost range is shown in its own block with its source and date; it is a range, not a quote. To compare against another unit of the same class, the replacement finder starts from a model number such as GDV-40 3**, listed by LOCHINVAR.
DOE CCD · 2026-09-19