ARISTON GN50L2-3-*
0.65 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 checking this gas tank model, the ARISTON GN50L2-3-* uses 260 therms of natural gas a year. That figure is for the high draw pattern, the standard daily hot-water usage DOE tests against. It is equal to the class median of 260 therms, a difference of 0 therms.
Energy use per year
260 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 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 204 of 414, lowest energy first.
Solid line: this model (260 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
- 0.65 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
- 78 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
$1,849–$3,282 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 ARISTON model on file
What this brand files, by heater type.
UEF 0.65 · Grade G Price it on your ZIP
The figure of 260 therms is computed by this site, not by the registry. One input is the registry's UEF, the ratio of hot water delivered to energy used. The registry lists a UEF of 0.65 for this model. The other input is the DOE test's daily hot-water draw for this draw pattern. The source is DOE CCD, retrieved 2026-09-19. The figure applies only to the high draw pattern and to natural gas. Real use in a home changes with the household's own hot-water demand, and this page does not estimate it. Read how the annual cost is calculated for the full method.
This model ranks 204th lowest for energy use among the 414 models registered as a gas tank at the high draw pattern. That places it in the second-lowest quarter of its class. Its 260 therms equals the class median of 260 therms, so the difference is 0 therms. Rank measures energy use only. The registry also lists a first hour rating, the gallons of hot water available in the first hour from a full tank. It is 78 gallons for this model, with a rated volume of 48 gallons. Neither capacity figure is part of the rank of 204th.
The high draw pattern describes a larger household, or one where showers and laundry overlap. A reader in that situation can compare the first hour rating of 78 gallons with their own busiest hour. A household with a lighter draw should not read 260 therms as its own yearly use, because the test draw would not match. The figure also does not cover any fuel other than natural gas. The running cost is not stated here. It depends on the state average residential gas price, so the cost calculator on your own ZIP computes it. To compare units in the same class, find a same-class replacement by model number.
DOE CCD · 2026-09-19