CO-Z JSD-24

The figure of 92 therms is not a registry entry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.83 for this unit, and from the DOE test's daily hot-water draw for the low draw pattern. The DOE CCD data was retrieved 2026-09-19. The figure therefore describes the test conditions, not a particular home. The low draw pattern represents a one- or two-person household, so a home with more people or longer daily use will burn more gas than 92 therms. The calculation is set out in how the annual cost is calculated.

Against its class, the unit sits 1 therms below the median of 93 therms. It ranks 3rd lowest energy use of 10 models registered as a gas tankless unit at the low draw pattern, which places it in the lowest quarter of its class for energy use. The gap to the median is 1 therms, so the ranking rests on a narrow spread among 10 models. The maximum flow rate in gallons per minute is 3.1; it is a flow limit and is separate from the energy figure. The unit suits a household whose use is close to the low draw pattern. It does not suit a household with a daily draw well above the test's, because 92 therms understates that use. To look at other models in the same class, find a same-class replacement by model number.

The running cost is not stated here. It depends on your state's average residential gas price, and this page assumes no rate. Multiply 92 therms by your own price per therm to get a yearly cost at the low draw pattern, or use the cost calculator on your own ZIP. The 1 therms gap to the 93 therms median amounts to 1 therms of gas priced at your rate. The installed price appears in its own block with its source and date, as a modeled range and not a quote. This page has no energy figure for other draw patterns. If your household does not match the low draw pattern, the selector by fuel, space and size covers other cases.