13 Va. Admin. Code § 5-200-100
Solar heating and hot water system functional description is contained in HUD Intermediate Minimum Property Standards for Solar Heating and Domestic Hot Water Systems, NBSIR #77-1226.
§ 58.1-3661 of the Code of Virginia.
Derived from VR394-01-8 § 100.1, eff. October 10, 1978; amended, Virginia Register Volume 24, Issue 26, eff. October 1, 2008.