EEMAX SPEX3512

The registry does not publish an annual energy figure, so this site computed 628 kWh for the EEMAX SPEX3512. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, of 0.94, together with the DOE test's daily hot-water draw for the very small pattern. The figure applies only under that condition. The source is DOE CCD, retrieved 2026-09-19. Among the 271 models registered as an electric tankless unit at this pattern, this one ranks 188th lowest for energy use. That places it in the second-highest quarter of its class. Its figure is 13 kWh above the class median of 615 kWh. The data available here do not show how the figure would change under any other draw pattern.

The very small draw pattern covers small units, meaning a single bathroom or a point-of-use heater under a sink. The maximum flow rate in gallons per minute for this model is 0.3. A reader with that kind of small, low-flow demand can treat 628 kWh as the like-for-like number when comparing models in the class of 271. It does not describe a household with heavier demand, because no figure for another draw pattern is available here. To narrow options by fuel, space and size, use the water heater selector. To compare against units in the same class, find a same-class replacement by model number.

The running cost is not stated in the text, because it depends on the electricity tariff you pay. The page computes it from your ZIP instead of assuming a rate. The arithmetic starts from the 628 kWh annual figure, so the 13 kWh gap to the class median of 615 kWh also converts at your own rate. To see the result for your location, use the cost calculator. The annual cost methodology explains how it is calculated. The modeled installed-cost range appears in its own block with its source and date. It is a modeled range, not a quote, and this text does not restate it.