RELIANCE WATER HEATERS 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).
If you are checking this RELIANCE WATER HEATERS GDV-40 3** against its registry entry, it uses 185 therms of natural gas a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That is equal to the class median of 185 therms, a difference of 0 therms.
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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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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Gas-fired storage tanks, every size and draw pattern on file.
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Every RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.6 · Grade F Price it on your ZIP
This model's registry entry lists a UEF, the ratio of hot water delivered to energy used, of 0.6. The annual energy figure is computed by this site, not the registry, from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The result is 185 therms of natural gas a year. The source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at the medium draw pattern, this unit has the 89th lowest energy use. The class median is 185 therms, and this model differs from it by 0 therms. That places it in the second-lowest quarter of its class.
The first hour rating, the gallons of hot water available in the first hour from a full tank, is 64 gallons for this model. Its rated volume is 39 gallons. Those values describe capacity and do not change the energy figure of 185 therms. The figure suits a plumber or seller checking a listing, or a homeowner comparing against the same class. It does not suit a household whose daily hot-water use differs from the medium draw pattern, because the figure applies only at the test's draw. To compare another fuel or size, use the selector by fuel, space and size. To find a same-class replacement by model number, enter GDV-40 3**.
This text does not state a running cost, because it depends on your state's average residential gas price. The cost calculator on your own ZIP applies that price to 185 therms, the figure at the medium draw pattern. If your household uses more or less hot water than that draw, your actual gas use will differ from 185 therms. The data here do not say by how much. The page on how the annual cost is calculated explains the method. The modeled installed-cost range appears in its own block on this page with its source and date, and it is not a quote.
DOE CCD · 2026-09-19