eyoo RA77V

The figure of 206 therms is computed by this site, not the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.82 with the DOE test's daily hot-water draw for the high draw pattern. It applies to natural gas at that test draw only. The page has no measured value for how much hot water any particular household draws. Against the 397 models registered as a gas tankless unit at the high draw pattern, the eyoo RA77V sits 24 therms above the class median of 182 therms. That places it 229th lowest for energy use, in the second-highest quarter of its class. The energy figure comes from DOE CCD, retrieved 2026-09-19.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The eyoo RA77V is registered at that pattern with a maximum flow rate in gallons per minute of 4.5. For a household that matches the pattern, the relevant comparison is the class median of 182 therms, which this model exceeds by 24 therms. For a household with lighter use, the figure of 206 therms does not apply, because it depends on the test's daily draw. The registry data used here gives no value for other draw patterns. To see other models in the same class, a same-class replacement can be found by model number through the replacement lookup.

The running cost is not stated here because it depends on the state average residential gas price for the reader's ZIP. The cost calculator on your own ZIP applies that price to 206 therms. The therm figure stays the same in every state, but the cost changes with the local rate. The same conversion applies to the 24 therms gap from the class median. The steps behind the calculation are described in how the annual cost is calculated. A modeled installed-cost range appears in its own block on the page, with its source and date. It is a modeled range, not a quote, and it is not restated in this text.