A. O. SMITH UPVA-90E 1**

The figure of 635 kWh is electricity use per year for A. O. SMITH UPVA-90E 1** at the very small draw pattern. This site computed it, not the registry, from the registry's UEF, the ratio of hot water delivered to energy used, of 0.93 and the DOE test's daily hot-water draw for this pattern. The source is DOE CCD, retrieved 2026-09-19. Compared with the 271 models registered as an electric tankless unit at the same draw pattern, this unit sits 20 kWh above the class median of 615 kWh. It ranks 218th lowest of 271 for energy use, which places it in the highest-energy-use part of its class. The calculation steps are described on the methodology page.

This class covers small units, such as a heater for a bathroom on its own or a point-of-use heater under a sink. The maximum flow rate in gallons per minute listed for this model is 0.8. The 635 kWh figure applies only to the very small draw pattern at the federal test's daily draw. It is not a measurement of any home, and the registry data used here gives no figure for other draw patterns. A reader whose hot-water use matches that small-unit description is the situation the figure describes. A reader who needs more hot water than the test assumes should not treat 635 kWh as their own usage. To look at other options, use the water heater selector or find a same-class replacement by model number.

The running cost is not written here because it depends on the electricity tariff you pay. The same 635 kWh costs different amounts under different rates, so any single price would be an estimate, and this page does not give one. The cost calculator takes your ZIP and applies your utility rate to the figure. Because this model is 20 kWh above the class median of 615 kWh, the class median would cost less at the same rate. The size of that gap in money depends on your rate and is not available on this page. The installed price range appears in its own block with its source and date, as a modeled range and not a quote.