ARISTON ENS50L-6*

The ARISTON ENS50L-6* is registered with a UEF, the ratio of hot water delivered to energy used, of 0.92. This site computed its annual energy of 3,531 kWh from that UEF and the DOE test's daily hot-water draw for the medium draw pattern; the registry does not publish that annual figure itself. The source is DOE CCD, retrieved 2026-09-19. The class is the 426 models registered as an electric tank at the medium draw pattern. Its median is 3,531 kWh, so this model differs from it by 0 kWh. Its rank is 213th lowest energy use of 426, in the second-lowest quarter of the class. The annual cost calculation method is described on the methodology page.

The figure of 3,531 kWh applies only at the medium draw pattern. A household whose hot-water use is above or below that daily draw will see a different annual energy use, and this page has no value for any other draw pattern. The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 52 gallons, and a rated volume of 42 gallons. Those two values describe supply, not efficiency, so they do not change the energy figure. The energy figure is most relevant to households whose use matches the medium draw pattern. It is less relevant to a reader who needs a figure for a heavier draw. The water heater selector by fuel, space and size covers other requirements.

The running cost is not in this text because it depends on your own utility electricity tariff. The calculation multiplies the annual energy of 3,531 kWh at the medium draw pattern by your rate per kilowatt-hour. The cost calculator for your own ZIP does this for you. Because the model sits 0 kWh from the class median of 3,531 kWh, a class model at the median would have the same annual cost at the same rate. To compare within the class, you can find a same-class replacement by model number. The installed-cost range appears in its own block on the page, with its source and date, and this text does not restate it.