ARISTON GN30L2-3-*
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).
Checking the ARISTON GN30L2-3-*? This gas tank water heater uses 185 therms of natural gas a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That equals its class median of 185 therms (difference 0 therms), ranking 89th lowest of 288 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
- 66 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 29 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety 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 30-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 0.6 · Grade F Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this model. The registry does not publish annual energy. This site computed the 185 therms figure from that UEF and the DOE test's daily hot-water draw for the medium draw pattern, using data from the DOE CCD retrieved on 2026-09-19. The class is the 288 models registered as a gas tank at the medium draw pattern. Its median is 185 therms, so this model sits 0 therms from the median. A rank of 89th lowest places it in the second-lowest quarter of the class for energy use. The method behind the annual calculation is documented separately.
The 185 therms figure describes one condition: the medium draw pattern, which represents a typical three- or four-person household on a busy morning. It suits a reader whose household resembles that pattern and who wants to confirm the registry-based figure. It does not describe a household with much higher or lower hot-water use, because this page has no energy figures for other draw patterns. The model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 66 gallons, and its rated volume is 29 gallons. This page does not judge whether those ratings meet a particular household's demand. To compare by fuel, space and size, use the water heater selector, or find a same-class replacement by model number.
The running cost is not stated here because it depends on your state's average residential gas price, and this page does not assume one. The calculation multiplies the 185 therms figure by the price per therm in your area, so the same model costs different amounts to run in different states. The cost calculator does this from your ZIP. An installed price range for this model is not published. Its ratings, 66 gallons first hour rating and 29 gallons rated volume, lie outside the range the cost database's model was fitted on, and the range is not stretched past it. Any installed price for this unit is therefore unknown from this data.
DOE CCD · 2026-09-19