Kiturami KTGWH-199CWS1

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.95 for this unit. This site combined that UEF with the test's daily draw for the high draw pattern. The result is 178 therms of natural gas a year. The registry does not publish that figure directly. It comes from this site's own calculation, using data retrieved from DOE CCD on 2026-09-19. Among the 397 models registered as a gas tankless unit at the high draw pattern, this one ranks 45th lowest for energy use. That places it in the lowest quarter of its class.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 178 therms figure applies only to that pattern. Energy use at another draw pattern is not available on this page. For this unit the registry lists a maximum flow rate in gallons per minute of 5.8, as a rated value. That is a rated limit, and it does not show how many fixtures the unit can serve at once. Treat the rank of 45th lowest as belonging to the high draw pattern only. The water heater selector filters by fuel, space and size if you want to compare other options.

The running cost is not stated in the text, because it depends on your state average residential gas price. This page does not estimate it. The cost calculator applies the price for your ZIP to the 178 therms figure at the high draw pattern. How the annual cost is calculated is documented on the methodology page. The same figure would give a different cost in a state with a different gas price. If you are replacing a unit, you can find a same-class replacement by model number. Compare replacements against the class median of 182 therms at the same draw pattern.