LOCHINVAR GPDL-40 3**
0.68 UEF DOE CCD · 2026-09-19Grade C: 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 anyone verifying this unit, the LOCHINVAR GPDL-40 3** uses 163 therms of natural gas a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 22 therms below the class median of 185 therms, ranking 5th lowest of 288.
Energy use per year
163 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 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 5 of 288, lowest energy first.
Solid line: this model (163 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
- 0.68 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
- 74 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
$1,877–$3,364 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
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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 0.68 · Grade C Price it on your ZIP
The figure of 163 therms was computed by this site, not published by the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.68 for this model. The site combines that value with the daily hot-water draw in the DOE test for the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The result applies to natural gas at that test draw and to no other condition. Against the class median of 185 therms, the model sits 22 therms lower among 288 gas tank models at the medium draw pattern.
The rank of 5th lowest of 288 puts this model in the lowest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 74. The rated volume is 38 gallons. These figures fit a household whose daily use is close to the medium draw pattern. A household that uses more hot water than the test draw will burn more gas than 163 therms. This page has no figure for other draw patterns, so it cannot say how far use would rise.
The running cost is not stated here because it depends on your state's average residential gas price. Multiply 163 therms by that price to get a yearly cost at the test draw. The cost calculator on your own ZIP does this for you. The steps are explained in how the annual cost is calculated. The gap of 22 therms to the class median is an energy gap, and this page does not convert it into money. A real bill can differ from the test draw. To compare another unit, you can find a same-class replacement by model number.
DOE CCD · 2026-09-19