### Question
How is the term instantaneous water heater defined?


### Answer
The term **instantaneous water heater** is defined in *42 U.S.C. § 6311* as the following:

> a water heater that has an input rating of at least 4000 Btu per hour per gallon of stored water

#### Citation:
  - *42 U.S.C. § 6311*
  - Heading: **CHAPTER 76-AGE DISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS > SUBCHAPTER III-IMPROVING ENERGY EFFICIENCY > Part A&ndash;1-Certain Industrial Equipment**

