Bosch TR4000C-3*

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.94 for this unit. This site does not read the annual figure from the registry. It computes 628 kWh from that UEF and the daily hot-water draw in the DOE test for the very small draw pattern, using DOE CCD data retrieved 2026-09-19. Among the 271 electric tankless models at this draw pattern, the unit ranks 188th lowest for energy use, which places it in the second-highest quarter of its class. Its figure is 13 kWh above the class median of 615 kWh. The calculation method is documented on a separate page.

The figure applies to small units, meaning a single bathroom or a point-of-use heater under a sink. The registry gives the maximum flow rate in gallons per minute as 0.4. The annual figure of 628 kWh is valid only at the very small draw pattern; for a larger daily draw, no energy figure is available on this page, and none is estimated here. A household running several fixtures at once is outside the condition that figure describes. To compare sizes and fuels, the water heater selector filters by fuel, space and size. To look for another model in the same class, use the replacement search by model number with TR4000C-3*.

Running cost is not stated in the text, because it depends on your own utility electricity rate. Multiplying 628 kWh by your rate per kilowatt-hour gives a yearly cost at this draw pattern. Applying the same rate to the 13 kWh gap from the class median of 615 kWh gives the difference against the median model. The cost calculator does this from your ZIP code. The installed-cost range is shown in its own block with its source and date, so it is not repeated here. The data holds no measured household usage, so a home that draws more or less than the federal test will differ from 628 kWh.