; or (ii) no WaterSense product of such type is reasonably available to meet the functional requirements of the agency; or (B) the water-consuming product being procured is designed for use in combat or combat-related missions. (b) Installation and maintenance As applicable, the head of an agency that procures a WaterSense product under subsection (a)(1) shall use a certified professional (including a licensed plumber or a licensed mechanical contractor, as appropriate) to install and maintain such product. (c) Measures To reduce water consumption The head of each agency shall consider adopting measures to reduce agency water consumption, including such measures as the use of— (1) water reuse, reclamation, or recycling technology; (2) water leak detection technology; and (3) products that— (A) do not consume water; and (B) perform similar functions as comparable water-consuming products. (d) Listing of WaterSense products The Administrator of General Services shall clearly identify and prominently display, in a listing of water-consuming products, WaterSense products. (e) Regulations Not later than 180 days after the date of enactment of this section, the Administrator of the Environmental Protection Agency and the Director of the Office of Management and Budget shall issue regulations to carry out this section. 4. Incentives for the purchase of WaterSense products (a) Establishment The Administrator of the Environmental Protection Agency shall establish a program to provide grants to eligible entities to provide incentives to covered consumers for the purchase of a WaterSense product. (b) Eligibility To be eligible to receive a grant under this section, an eligible entity shall— (1) submit an application to the Administrator at such time, in such form, and containing such information as the Administrator may require