ARISTON GN50T1-3-*

The figure of 269 therms was computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.63 with the daily hot-water draw the DOE test applies to the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The model is compared with the 414 models registered as a gas tank at the high draw pattern. Its rank is 320th lowest energy use of 414, which is in the highest quarter of its class for energy use. Its annual figure is 9 therms above the class median of 260 therms.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 85 gallons for this model, and the rated volume is 47 gallons. A reader can check those two figures against the household's busiest hour. The model fits a reader who needs a gas tank at this draw pattern and accepts 269 therms a year. It fits less well a reader who ranks models mainly by low energy use, because 320th lowest of 414 is above the median. The registry data does not show how any one household's hot-water demand compares. To narrow the choice by fuel, space and size, use the water heater selector.

The running cost is not stated here. It depends on the state average residential gas price, so it has to be computed from your ZIP. The cost calculator applies your own rate to the 269 therms figure at the high draw pattern. The steps behind that calculation are set out in the annual cost methodology. If you are comparing this unit with another of the same class, you can find a same-class replacement by model number. The installed price range appears in its own block on this page with its source and date. It is a modeled range, not a quote, and it is not repeated in this text.