ARISTON GN50T2-3-*

The figure of 256 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 0.66 with the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The class is the 414 models registered as a gas tank at this draw pattern, and its median is 260 therms. This model sits 4 therms below that median. It ranks 192nd lowest in energy use of 414, which places it in the second-lowest quarter of its class. The data here does not show how that difference changes a household's bill.

This model is registered for the high draw pattern, which describes a larger household, or one where showers and laundry overlap. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 86 gallons, with a rated volume of 47 gallons. Those are the two values that relate to a household's busiest hour. The registry data does not say whether they cover any particular home. The 256 therms figure does not apply to a household that matches a different draw pattern, and no value for that case is available here. To narrow the field by fuel, space and size, the water heater selector covers those filters.

The running cost is not written in this text, because it depends on the state average residential gas price, which differs by reader. The cost calculator applies the price for your ZIP to the 256 therms of natural gas this model uses at the high draw pattern. The steps behind that calculation are described in the cost methodology. The modeled installed-cost range appears in its own block on this page, with its source and date, and it is not a quote. To look at another gas tank in the same class, find a same-class replacement by model number, and use the class median of 260 therms as the reference point.