RINNAI RE180I (REU-VE2432FFD-US)

This site, not the registry, computes the 206 therms figure. It uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.82. The source is the DOE CCD, retrieved 2026-09-19. The class includes the 397 models registered as a gas tankless unit at the high draw pattern. This model ranks 229th lowest for energy use in that class. That puts it in the second-highest quarter of its class for energy use. You can see how the figure is built in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 206 therms figure applies only at that pattern's daily draw. A household that uses less hot water each day would use a different amount of energy, and that amount is not available here. The registry also lists this model's maximum flow rate in gallons per minute as 4.1. The data does not say how many fixtures that flow rate can serve at the same time. If you are checking this unit against others, its place is 229th of the 397 models in its class. To look up other models in the same class, use find a same-class replacement by model number.

This text does not give a running cost for this model. The cost depends on your state's average residential gas price. For that reason, the page calculates it from your ZIP instead of giving one figure for everyone. Your gas price applies to the 206 therms this model uses each year at the high draw pattern. The same price also applies to the 24 therms gap above the class median. To see the cost at your own rate, use the cost calculator on your own ZIP. The installed price range is shown in its own block, with its source and date. It is a modeled installed-cost range, not a quote.