// CODE SNIPPET
702.8 Efficient Hot and Tempered Water Distribution
JUMP TO FULL CODE CHAPTER
Hot and tempered water distribution shall comply with either the maximum pipe length or maximum pipe volume limits in this section. Hot and tempered water shall be delivered to the outlets of individual showers, combination tub-showers, sinks, lavatories, dishwashers, washing machines and hot water hose bibbs in accordance with Section 702.8.1 or Section 702.8.2. For purposes of this section, references to pipe shall include tubing. For purposes of this section, the source of hot or tempered water shall be considered to be a water heater, boiler, circulation loop piping or electrically heat-traced piping.
The maximum allowable pipe length from the source of hot or tempered water to the termination of the fixture supply pipe shall be in accordance with the maximum pipe length columns in Table 702.8.2. Where the length contains more than one size of pipe, the largest size shall be used for determining the maximum allowable length of the pipe in Table 702.8.2.
The water volume in the piping shall be calculated in accordance with Section 702.8.2.1. The maximum volume of hot or tempered water in the piping to public lavatory faucets, metering or nonmetering, shall be 2 ounces (0.06 L). For fixtures other than public lavatory faucets, the maximum volume shall be 64 ounces (1.89 L) for hot or tempered water from a water heater or boiler; and 24 ounces (0.7 L) for hot or tempered water from a circulation loop pipe or an electrically heat-traced pipe.
|NOMINAL PIPE OR TUBE
|LIQUID OUNCES PER FOOT
|MAXIMUM PIPE OR TUBE LENGTH|
|System without a circulation
loop or heat-traced line (feet)
|System with a circulation
loop or heat-traced line (feet)
|Lavatory faucets — public
(metering and nonmetering)
|2 or larger||18||4||1||0.5|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m, 1 ounce = 29.6 ml.
- The flow rate for 1/4-inch size pipe or tube is limited to 0.5 gallons per minute; for 5/16-inch size, it is limited to 1 gpm; for 3/8-inch size, it is limited to 1.5 gpm.
The volume shall be the sum of the internal volumes of pipe, fittings, valves, meters and manifolds between the source of hot water and the termination of the fixture supply pipe. The volume shall be determined from the liquid ounces per foot column of Table 702.8.2. The volume contained within fixture shutoff valves, flexible water supply connectors to a fixture fitting, or within a fixture fitting shall not be included in the water volume determination. Where hot or tempered water is supplied by a circulation loop pipe or an electrically heat-traced pipe, the volume shall include the portion of the fitting on the source pipe that supplies water to the fixture.
Related Code Sections
702.8 Water Resource Conservation, Quality and Efficiency, Efficient Hot and Tempered Water Distribution
Hot and tempered water distribution shall comply with either the maximum pipe length or maximum pipe volume limits in this section. Hot and tempered ...
Green Construction Code 2012 of Maryland > 7 Water Resource Conservation, Quality and Efficiency > 702 Fixtures, Fittings, Equipment and Appliances > 702.8 Efficient Hot and Tempered Water Distribution
Section 607 Water Supply and Distribution, Hot Water Supply System
or building maintenance purposes. In nonresidential occupancies , hot water or tempered water shall be supplied for bathing and washing purposes ...
R403.5.2 [RE] Residential Energy Efficiency, Demand Recirculation Systems
or sensing the flow of hot or tempered water to a fixture fitting or appliance. The control shall limit the temperature of the water entering ...
Energy Conservation Code 2015 of Maryland > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.5 Service Hot Water Systems > R403.5.2 Demand Recirculation Systems
607.1.2 Water Supply and Distribution, Tempered Water Temperature Control
Tempered water shall be supplied through a water temperature limiting device that conforms to ASSE 1070/ASME A112.1070/CSA B125.70 and shall limit ...
Plumbing Code 2018 of Maryland > 6 Water Supply and Distribution > 607 Hot Water Supply System > 607.1 Where Required > 607.1.2 Tempered Water Temperature Control
R403.5 [RE] Residential Energy Efficiency, Service Hot Water Systems
of hot or tempered water to a fixture fitting or appliance. The control shall limit the temperature of the water entering the cold water piping ...
Energy Conservation Code 2015 of Maryland > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.5 Service Hot Water Systems