JETGLAS RG2F40S*N

The figure of 242 therms is computed by this site, not published by the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.7 for this model. The site then applies the DOE test's daily hot-water draw for the high draw pattern. It applies to natural gas at that test draw only. A household that draws more or less hot water than the test will use a different amount. The figure checks a rating; it does not predict a bill. The source is DOE CCD, retrieved 2026-09-19.

Within its class, this model has the 90th lowest energy use of 414, which places it in the lowest quarter, and it sits 18 therms below the class median of 260 therms. The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 75 gallons, and a rated volume of 38 gallons. The high draw pattern describes a larger household, or one where showers and laundry overlap, so these are the ratings to compare against that use. The class comparison does not carry over to other fuels or draw patterns, and it does not rank hot-water capacity. To filter by fuel, space and size, use the water heater selector. For a same-class alternative, find a replacement by model number.

Running cost is not stated in the text, because it depends on your state's average residential gas price. Multiply 242 therms by that price per therm to check it, or enter your ZIP in the cost calculator, which performs the same calculation. The 18 therms gap to the class median of 260 therms changes the yearly cost by that quantity of gas at whatever price applies. The registry data holds no price of its own. The methodology page explains how the annual cost is calculated. The modeled installed-cost range appears in its own block on this page with its source and date. It is a range, not a quote, and it is not repeated here.