ARISTON GN30T1-3-*
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 the ARISTON GN30T1-3-* gas tank water heater, this site calculates 185 therms of natural gas a year. That figure applies to the medium draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 185 therms, and the model ranks 89th lowest in energy use of 288 gas tank 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
- 70 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 DOE registry does not print the 185 therms figure. This site computes it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used. The second is the daily hot-water draw in the DOE test. For this unit the UEF is 0.6, taken from DOE CCD data retrieved 2026-09-19. The medium pattern stands for a typical household's daily use, with a busy morning peak. So the 185 therms of natural gas applies only at that test draw. A home that uses more or less hot water each day would use a different amount of gas. The registry gives no figure for other draws, so that amount is not available here. The steps behind the calculation are set out in how the annual energy and cost figures are calculated.
The ARISTON GN30T1-3-* has a rated volume of 29 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 70 gallons. That suits a home whose morning peak stays within 70 gallons. If a home's peak is higher, this rating does not cover it. The 0 therms gap noted above means this model saves no energy against the median of the 288 gas tank models at the medium pattern. Its 89th place is counted from the model with the lowest energy use. To compare models in the same class, use the same-class replacement search by model number. To compare models of other sizes, use the selector by fuel, space and size.
This page does not state the running cost of 185 therms a year, because that cost depends on your state's average residential gas price. The page computes it from your ZIP instead. You can also run the cost calculator on your own ZIP. No installed price range is published for the GN30T1-3-*. Its ratings lie outside the range the cost database's model was fitted on. The site does not stretch that range to cover this unit, so its installed price is not available. This data also says nothing about reliability or installation. If you are a plumber or seller checking a quote, the numbers you can verify on this page are the energy figure, the UEF of 0.6 and the class rank.
DOE CCD · 2026-09-19