RELIANCE WATER HEATERS GPDT-50 3**
0.72 UEF DOE CCD · 2026-09-19Grade E: 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 RELIANCE WATER HEATERS GPDT-50 3**, it uses 235 therms of natural gas a year. That figure applies at the high draw pattern, the standard daily hot-water usage DOE tests against. It sits 25 therms below the 260 therms median of the 414 gas tank models registered at that draw pattern.
Energy use per year
235 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 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 50 of 414, lowest energy first.
Solid line: this model (235 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
- 0.72 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
- 79 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 48 gal DOE CCD · 2026-09-19
What it costs to install
$2,258–$4,333 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 50-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 RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.72 · Grade E Price it on your ZIP
This site calculated the 235 therms figure; the registry does not publish it. The calculation 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 draw pattern. This model's UEF is 0.72, taken from the DOE CCD registry, retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, it ranks 50th lowest in annual energy use. That puts it in the lowest quarter of its class for energy use. The figure holds only at the federal test's daily draw. A household that uses a different amount of hot water each day will use a different amount of gas. The page on how the annual energy and cost figures are calculated sets out each step.
The high draw pattern describes 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 79 gallons. Its rated volume is 48 gallons. The class comparison covers only gas tank models tested at the high draw pattern. It tells you nothing about models that use another fuel, have another heater type or were tested at another draw pattern. If your household's daily use is well below the test's draw, the 235 therms figure does not describe its use. To compare across those lines, use the water heater selector by fuel, space and size. To check alternatives inside this class, you can find a same-class replacement by model number.
This text does not give a running cost. The cost depends on your state's average residential natural gas price, so the page calculates it from your ZIP. The 25 therms gap to the 260 therms class median is the gas this model uses less each year than a median unit, at the high draw pattern. What that gap is worth therefore depends on your own gas price. The installed-cost range in its own block is a modeled range with its source and date. It is not a quote. This page cannot show your household's actual daily hot-water draw; that value is unknown here. To see the running cost at your rate, enter your ZIP in the running cost calculator for your own ZIP.
DOE CCD · 2026-09-19