To increase water efficiency within the tenant space to reduce the burden on municipal water
Employ strategies that in aggregate use 20% less water than the water use baseline calculated for the tenant space (not including irrigation).
BUILDING WATER USE
Calculate the baseline according to the commercial baselines outlined below. Calculations are based on estimated occupant usage. Include only the following fixtures and fixture fittings (as applicable): water closets, urinals, lavatory faucets, showers, kitchen sink faucets, and pre-rinse spray valves.
|Fixtures, Fittings, and Appliances||Current Baseline (Imperial Units)||Current Baseline (Metric Units)|
|Commercial Toilets||1.6 gallons per flush (gpf)*
Except blow-out fixtures: 3.5 (gpf)
|6 liters per flush (lpf)
Except blow-out fixtures: 13.5 lpf
|Commercial Urinals||1.0 (gpf)||4.0 lpf|
|Commercial Lavatory (restroom) Faucets||2.2 gallons per minute (gpm) at 60 pounds per square inch (psi),private applications only (hotel or motel guest rooms, hospital patient rooms)
0.5 (gpm) at 60 (psi)**all others except private applications
0.25 gallons per cycle for metering faucets
|8.5 liters per minute (lpm) at 4 bar (58 psi), private applications only (hotel or motel guest rooms, hospital patient rooms)
2.0 lpm at 4 bar (58 psi), all others except private applications
1 liter per cycle for metering faucets
|Shower||2.5 (gpm) at 80 (psi) per shower stall||9.5 lpm at 5.5 bar (80 psi) per shower stall|
|Kitchen Faucet||2.2 (gpm) at 60 (psi)||8.5 lpm at 4 bar (58 psi)|
|Commercial Pre-rinse Spray Valves
(for food service applications)
|Flow rate ≤ 1.6 (gpm)
(no pressure specified; no performance requirement)
|Flow rate ≤ 6 lpm (no pressure specified; no performance requirement)|
|* EPAct 1992 standard for toilets applies to both commercial and residential models.
** In addition to EPAct requirements, the American Society of Mechanical Engineers standard for public lavatory faucets is 0.5 gpm at 60 psi (2.0 lpm at 4 bar (58 psi)) (ASME A112.18.1–2005).
This maximum has been incorporated into the national Uniform Plumbing Code and the International Plumbing Code.
COMMERCIAL PROCESS WATER USE
Employ strategies that in aggregate use 20% less water than the water use baseline calculated for commercial equipment performance requirements as listed in the following table. Base the calculations on estimated occupant usage. Include only the following fixtures (as applicable): clothes washers, dishwashers, ice machines, food steamers, and combination ovens.
Exemptions from calculations:
- Appliances and equipment that use water for human consumption may be excluded. Examples: bread misters, produce misters, soda machines, coffee-making machines, and fixtures used to fill sinks for washing produce.
- Equipment, appliances, fixtures, and fittings not covered by the Energy Policy Act of 1992 (EPAct 1992), do not contribute toward the retail process, and are not commercially rated may also be excluded. Example: a residential dishwasher in an employee break room.
- Fixtures whose flow rates are regulated by health codes may be excluded. Example: fixtures used for filling dishwashing sinks in which water must be maintained at a certain temperature.
|Commercial Equipment||Baseline (Imperial Units)||Baseline (Metric Units)|
|Commercial clothes washer, less than 80 lbs (36.3 kg)||9 gallons/cf/cycle||1,200 liters/m3/cycle|
|Under counter, high temperature||1.98 gallons/rack||7.50 liters/rack|
|Under counter, low temperature||1.95 gallons/rack||7.38 liters/rack|
|Door type, high temperature||1.44 gallons/rack||5.45 liters/rack|
|Door type, low temperature||1.85 gallons/rack||7.00 liters/rack|
|Single tank rack conveyor, high temperature||1.13 gallons/rack||4.28 liters/rack|
|Single tank rack conveyor, low temperature||1.23 gallons/rack||4.66 liters/rack|
|Multi- tank rack conveyor, high temperature||1.1 gallons/rack||4.16 liters/rack|
|Multi- tank rack conveyor, low temperature||0.99 gallon/rack||3.75 liters/rack|
|Flight type||180 gph||681.37 lph|
|Commercial ice machines|
|Ice machine, IMH (ice-making head) H < 450 lbs/day (<204.11 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, IMH (ice-making head) H > 450 lbs/day (>204.11 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, RCU (no remote compressor) H < 1,000 lbs/day (<453.59 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, RCU (no remote compressor) H > 1,000 lbs/day (>453.59 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, RCU (remote compressor) H < 934 lbs/day (<423.66 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, RCU (remote compressor) H > 934 lbs/day (>423.66 kg/day)||< 25 gal/100 lbs ice||< 95 liters/46 kg ice|
|Ice machine, SCU (self-contained unit)||< 35 gal/100 lbs ice||< 133liters/46 kg ice|
|Ice machine, water-cooled||Must be on chilled loop||Must be on chilled loop|
|Ice machine, once-through water-cooled||Banned||Banned|
|Steam cooker, batch cooking||8 gph/pan||3085.11 lph/pan|
|Steam cooker, high production or cook to order||8 gph/pan||317.97 lph/pan|
|Countertop or stand mounted||40 gph||151.42 lph|
|Roll-in||60 gph||227.12 lph|
|Other equipment||Based on industry standards||Based on industry standards|
|Notes: gph = gallons per hour; cf = cubic feet; lph = liters per hour; H = ice production.|
For equipment not listed in the above tables, the project team may propose performance baseline requirements, with documentation supporting the proposed benchmark.
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