A. O. SMITH UPVA-110Y 1**

The figure of 628 kWh is a computed value, not a registry entry. This site derived it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.94 for this model, and from the DOE test's daily hot-water draw for the very small draw pattern. The source is DOE CCD, retrieved 2026-09-19. The unit is an electric tankless heater with a maximum flow rate in gallons per minute of 1. The result describes the federal test's draw only and does not measure use in any particular home. The methodology page explains how the annual cost is calculated from this energy figure.

Among the 271 models registered as an electric tankless unit at the very small draw pattern, this one ranks 188th lowest in energy use. Its 628 kWh is 13 kWh above the class median of 615 kWh, which places it in the second-highest quarter of its class for energy use. The gap is measured at the test's draw only, and the data do not show how it changes at other draws. The very small draw pattern fits small units, such as a bathroom or a point-of-use heater under a sink. The figure does not describe a larger household's use. Readers who want a same-class alternative can find a replacement by model number.

The running cost is not stated here because it depends on your own utility electricity tariff. Multiply 628 kWh by your rate per kilowatt-hour to get the cost at the test's draw. The cost calculator does this from your ZIP. A model at the class median of 615 kWh would use 13 kWh less each year at the same draw, and the cost of that gap scales with your rate. The installed price range appears in its own block on this page, with its source and date, as a modeled installed-cost range and not a quote. For a comparison by fuel, space and size, use the water heater selector.