AMERICAN GUC-30 4**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.59 for this model. The registry does not publish a yearly energy figure. This site computed 188 therms of natural gas from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The figure holds only at that test draw. A household that uses more or less hot water will use a different amount, and this page does not estimate it. Within its class, the model sits in the second-highest quarter of the 288 gas tank models for energy use. The source is DOE CCD, retrieved 2026-09-19.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 62 gallons, and the rated volume is 29 gallons. These describe supply at peak demand, not annual energy. The model suits a household whose busiest hour of hot-water use fits within 62 gallons and that accepts energy use above the class median of 185 therms. It suits a household less well if peak-hour demand is higher than that rating. It also suits less well where the lowest gas use in the class is the main aim, since 186th lowest of 288 means other models use less. The replacement finder by model number lists same-class options. The selector by fuel, space and size narrows by those criteria.

Running cost is not stated here because it depends on the state average residential gas price, and this page does not estimate it. Multiply 188 therms by your own gas rate, or use the cost calculator on your own ZIP, which applies your state average. The method behind the annual cost is documented separately. An installed price range is not published for this model: its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past that. The energy figure is for the medium draw pattern only, so the result changes if your household's hot-water use differs from the test draw.