A. O. SMITH UPVA-80Y 1**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.94 for the A. O. SMITH UPVA-80Y 1**. It does not list annual energy. This site computed 628 kWh of electricity a year from that UEF and the daily hot-water draw DOE uses for the very small draw pattern, so the figure is not a registry value. The source is DOE CCD, retrieved 2026-09-19. Among the 271 electric tankless models registered at this draw pattern, the unit uses 13 kWh more than the class median of 615 kWh. It ranks 188th lowest for energy use, which places it in the second-highest quarter of its class. The calculation is described on the methodology page for annual cost.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The 628 kWh figure applies only to that pattern, so it fits a reader whose use matches it. The maximum flow rate in gallons per minute is 0.8. A household that needs more flow than 0.8, or a larger draw, is outside the condition this figure describes, and this page has no energy value for other draw patterns. Because the unit sits 13 kWh above the class median of 615 kWh, other models in the class use less. The water heater selector by fuel, space and size and the same-class replacement search by model number list alternatives.

The running cost is not written here because it depends on your own electricity tariff. The page computes it from your ZIP, and it scales with the 628 kWh shown above. A different rate changes the cost, while the energy figure stays the same for the very small draw pattern. Enter your ZIP in the cost calculator for your own rate to see it. The energy figure is a test-based calculation from data retrieved 2026-09-19, not a measurement in a home. A household whose daily draw differs from the federal test's will use a different amount, and how much different is not available. The modeled installed-cost range appears in its own block on this page, with its source and date.