"RUBS" is an acronym for "ratio utility billing system".  Per § 55-226.2 of Virginia law, "A 'ratio utility billing system' means a program that utilizes a mathematical formula for allocating, among the tenants in a building...the actual or anticipated [utility] billings billed to the building...owner from a third-party provider of the utility service.  Permitted allocation methods may include formulas based upon square footage, occupancy, number of bedrooms, or some other specific method agreed to by the building...owner and the tenant in the rental agreement or lease."
RUBs for Heating Fuel: King & Queen Apartments has a single meter for heating fuel.  The meter is read at the beginning of each month and the square footage of an individual dwelling unit (and the office on premises shall also be considered an individual dwelling unit for this purpose) is divided by the total number of square feet contained in the building, to determine that dwelling unit’s percentage of usage (the “Unit Percentage”).   The total heating fuel usage for the apartment community as indicated on the monthly meter reading is then multiplied by the applicable Unit Percentage for each dwelling unit to determine the allocated amount for heating fuel usage for each dwelling unit for the month.
RUBs for Heating Fuel for Hot Water: King & Queen Apartments has a single meter for heating fuel for hot water.  The meter is read at the beginning of each month and the charges are allocated to each unit based upon the individual unit's percentage of the total number of occupants living in the apartment community ("Unit Occupancy").  The total heating fuel for hot water usage for the apartment community is indicated on the monthly meter reading is then divided by the applicable Unit Occupancy for each dwelling unit to determine the allocated amount for heating fuel for hot water usage for each dwelling unit for the month.