Chronomite R

This site calculates the 609 kWh figure; the registry does not state it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for this draw pattern. For the Chronomite R, the UEF is 0.97, from DOE CCD data retrieved 2026-09-19. There are 271 models registered as an electric tankless unit at the very small draw pattern. Among them, this model ranks 37th lowest in energy use. That puts it in the lowest quarter of its class. The gap to the class median is 6 kWh a year, measured at the same test draw. The method behind the figure is set out in how the annual cost is calculated.

The very small draw pattern covers small units, such as a single bathroom or a point-of-use heater under a sink. The Chronomite R is listed with a maximum flow rate in gallons per minute of 1.2. A plumber verifying a swap can check other units of this class with a same-class replacement search by model number. The 609 kWh figure does not describe a home that draws more hot water than the test assumes. This page has no energy figure for a larger daily draw. If the need goes beyond this draw pattern, the selector by fuel, space and size covers other classes. Their figures cannot be compared with this unit's rank of 37th.

This text does not state a running cost. The cost depends on your own utility's electricity tariff, so the page calculates it from your ZIP. The cost calculator on your own ZIP applies your rate to the 609 kWh test figure. At the same rate, the class median of 615 kWh would differ in cost by the value of 6 kWh. The cost of any usage above the test draw is unknown here. The modeled installed-cost range is shown in its own block, with its source and date. That range is a model, not a quote.