ARISTON ENS50T-*

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.92 for this electric tank. This site, not the registry, computed the 3,531 kWh figure from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The energy data comes from DOE CCD, retrieved 2026-09-19. The figure holds only under those test conditions and counts electricity use, not price. A household with different daily hot-water use would see different energy use, and this page does not estimate that difference. The steps behind the calculation are described in how the annual cost is calculated.

The class here is the 426 models registered as an electric tank at the medium draw pattern. Their median is 3,531 kWh, so this model differs from the median by 0 kWh. It ranks 213th lowest for energy use of 426, which places it in the second-lowest quarter of its class. That position describes energy use at the test draw only; it does not rank models on price, size or hot-water delivery. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 60 gallons, and the rated volume is 45 gallons. A household whose morning demand exceeds those figures is outside what this comparison covers. To compare units by fuel, space and size, use the water heater selector.

Running cost is not written in this text because it depends on your own utility electricity rate. The cost calculation starts from 3,531 kWh at the medium draw pattern and applies the tariff for your ZIP; the cost calculator on your own ZIP does this for you. The modeled installed-cost range appears in its own block with its source and date. It is a modeled range, not a quote, and it is not restated here. If you are replacing this unit, you can find a same-class replacement by model number using ENS50T-*. What this page cannot show is energy use in a home whose hot-water demand differs from the test draw.