BRADFORD WHITE RTGS199N1**

The figure of 176 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 0.96 for this model, with the DOE test's daily hot-water draw for the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. This model is compared with the 397 models registered as a gas tankless unit at the same draw pattern. It ranks 12th lowest energy use of 397, which places it in the lowest quarter of its class. The gap to the 182 therms median is 6 therms a year at that draw. The steps behind the calculation are described under how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap, so the figure of 176 therms applies to that kind of use. The registered maximum flow rate in gallons per minute is 5.8. A household with lighter or heavier daily use than the federal test's draw will use a different amount of gas, and the registry does not say how much different. Measured gas use in an individual home is not available in the data. If your household fits a different draw pattern, the water heater selector filters by fuel, space and size. To look for a unit in the same class, you can find a same-class replacement by model number.

The running cost is not stated in the text, because it depends on your state's average residential gas price. Multiplying 176 therms by that price gives the yearly cost of this model at the high draw pattern. The same price applied to the class median of 182 therms shows what the 6 therms difference is worth in your state. The cost calculator on your own ZIP does this with your location. The modeled installed-cost range appears in its own block on this page with its source and date. It is a modeled range, not a quote, and it is not repeated here.