Pub. L. 110-140, tit. V, subtit. C, sec. 523
STANDARD RELATING TO SOLAR HOT WATER HEATERS.
SEC. 523. STANDARD RELATING TO SOLAR HOT WATER HEATERS. Section 305(a)(3)(A) of the Energy Conservation and Production Act (42 U.S.C. 6834(a)(3)(A)) is amended—(1) in clause (i)(II), by striking “and” at the end;(2) in clause (ii), by striking the period at the end and inserting “; and”; and(3) by adding at the end the following:“(iii) if lifecycle cost-effective, as compared to other reasonably available technologies, not less than 30 percent of the hot water demand for each new Federal building or Federal building undergoing a major renovation be met through the installation and use of solar hot water heaters.”.