Conserving Hot Water Through Bath and Shower Diverter

WaterSense®
Conserving Hot Water Through
Bath and Shower Diverter labeling
February 27, 2017
Richa Sharma, US EPA
Tessa Roscoe, Eastern Research Group
Agenda
• Introduction to WaterSense
• Bath and Shower Diverter Background
• Notice of Intent (NOI) for Bath and Shower Diverters
– Scope
– Leak rate criteria
– Performance criteria and product testing
– Next steps
3/6/2017
Part 1:
Introduction to WaterSense
What Is WaterSense?
• Voluntary partnership and labeling
program launched by EPA in 2006
designed to reduce municipal
water use across the country
• Simple way for consumers to
identify products that are waterefficient and perform well
• A label with integrity—products are independently certified
• Aims to increase the adoption of water-efficient products,
homes, and programs by consumers and organizations
3/6/2017
WaterSense Product
Evaluation Factors
WaterSense uses several factors to determine which
products to label. Products must:
– Offer equivalent or superior performance
– Be about 20 percent more water-efficient than
standard models
– Realize water savings on a national level
– Provide measurable results
– Achieve water efficiency through several
technological options
– Be effectively differentiated by the WaterSense label
– Be independently certified
3/6/2017
WaterSense Labeled Products
More than 21,000
product models have
earned the
WaterSense label
Flushing
Urinals
Lavatory
Faucets
Irrigation
Controllers
Flushometer-Valve
Toilets
Tank-Type
Toilets
3/6/2017
Showerheads
Pre-Rinse
Spray Valves
Accomplishments
7
3/6/2017
Part 2:
Bath and Shower Diverter
Background
Bath and Shower Diverter
Background
• A device that diverts the flow of water either to the bath tub
through the tub spout or to the showerhead.
• Commonly found in residential bathrooms and private
commercial restrooms (e.g., hotels)
Tub Spout Diverters
3/6/2017
Tub-to-shower Diverters
Bath and Shower Diverter
Background
• These diverters can leak water through the tub spout
when the entire flow should be diverted to the
showerhead.
• Leakage occurs throughout the
shower event
• Leak rates typically increase
over the lifetime of the product
• Often leak hot water, resulting in
water and energy waste
3/6/2017
Bath and Shower Diverter
Background
Existing performance/efficiency standards:
• National: ASME A112.18.1/CSA B125.1 Plumbing Supply Fittings
• State: California Energy Commission’s (CEC) Appliance
Efficiency Regulations
Pre-Life Cycle
Leak Rate
Post-Life Cycle
Leak Rate
ASME A112.18.1/
CSA B125.1
0.1 gpm
0.2 gpm
CEC Appliance
Efficiency Regulations
0.01 gpm
0.05 gpm
Standard
3/6/2017
Field Study:
Taitem Engineering
• In 2011, Taitem Engineering, PC, LLC. assessed bath and
shower diverter leaks for the New York State Homes and
Community Renewal Agency.
• Examined 120 bath and shower
diverters in residential apartment
buildings:
– 34 percent of diverters leaked
more than 0.1 gpm
– The largest leak observed was
3.0 gpm
– The average of all leaks greater
than 0.1 gpm was 0.8 gpm
3/6/2017
Taitem Engineering, PC, 2011.
“Leaking Shower Diverters”
Field Study:
Taitem Engineering
• Taitem Engineering also assessed the potential energy
savings inherent in fixing bath and shower diverter leakage.
• Fixing a diverter leak that saves 0.8
gallons of water per minute could save
2,785 gallons per household per year.
– Saves 415 kWh/year or 17
Therms/year
– Monetary savings of $18 to 50/year
– Additional energy savings mean
faster consumer payback rates!
3/6/2017
Bath and Shower Diverter
Background
• EPA estimates there are 145 million bath and shower diverters installed
in homes and another 3 million in hotels across the United States.
• Field studies show older models on
average leak 0.3 gpm.
– This will waste 2.3 gallons of water
with every shower
– wasting 1,500 gallons a year!
– Equals water needed for 90
showers
– Saves nearly 190 kWh per year
with an electric hot water heater
3/6/2017
2.3 Gallons
Bath and Shower Diverter
Background
• Many models currently on the
market can eliminate leaks entirely
• New, innovative designs
3/6/2017
Bath and Shower Diverter
Background Summary
WaterSense Labeled
Product
Estimated Annual Household
Water Savings (gal)
Pre-Rinse Spray Valves
7,000
Flushing Urinals
4,600
Showerheads
2,900
Bath and Shower Diverters
1,500
Faucet Aerators
700
Utilities serving 200,000 households that replace their old,
leaky bath and shower diverters could save
300 million gallons of water and 37 MWh a year.
3/6/2017
Bath and Shower Diverter
Background Summary
• A WaterSense specification for bath and shower diverters
would
– Draw attention to old, leaky diverters that persistently
waste water and energy
– Recognize the top performing technologies on the
market
– Drive the market to offer even more options that
effectively do not leak
3/6/2017
Part 3:
WaterSense
Notice of Intent (NOI) for
Bath and Shower Diverters
Scope Considerations
• WaterSense labeling criteria for bath and shower diverters
will apply to:
– Product Category: Bath and Shower Diverters
– Product Families: Tub Spout and Tub-to-Shower Diverters
• WaterSense intends to exclude:
– Other types of diverters (shower-to-shower, bidet,
shampoo, shower-to-body spray diverters, etc.)
– Companion products such as twin ell adaptors, vacuum
breakers, or in-line flow control devices
3/6/2017
Scope Considerations:
Product Families
Tub Spout Diverters
Tub-to-Shower Diverters
diverter mechanism is
embedded in the tub spout fitting
diverter mechanism is embedded
as a valve in plumbing .
3/6/2017
Proposed Criteria:
Product Life Cycle
• WaterSense is considering setting leak rate limits that
apply to the entirety of a bath and shower diverter’s
life cycle by establishing:
– a pre-life cycle leak rate limit and
– a post-life cycle leak rate limit
• WaterSense is considering adopting 15,000 cycles for
a bath and shower diverter life cycle, same as the
ASME/CSA standard.
• 15,000 cycles = +22 years of use in a typical home
3/6/2017
Proposed Criteria:
Leak Rate
• WaterSense is considering setting “0-0” limits for bath
and shower diverters.
Standard
Pre-Life Cycle
Leak Rate (gpm)
Post-Life Cycle
Leak Rate (gpm)
National: ASME/CSA
0.1
0.2
State: CEC
0.01
0.05
WaterSense
0
0
3/6/2017
Products in CEC database
Diverter
No. Models
% Models With
Total Models in
With “0-0” Test
“0-0” Test
Database
Results
Results
Lift-Type
1907
535
28%
Pull-Type
183
69
38%
Push-Type
149
53
36%
Turn-Type
658
596
91%
Total
2,897
1,253
43%
• WaterSense aims to drive the market to offer even more
options that effectively do not leak.
3/6/2017
Leak Rate Criteria:
Savings Factor
• When a diverter leak is fixed, some of the water is
diverted to the showerhead and used in the shower event.
• Taitem Engineering’s study quantifies the fraction of water
not diverted back to the shower as the savings factor.
• Based on this study, the actual household savings from
replacing leaking diverters would be reduced.
• The savings factor can be impacted by:
- system water pressure
- magnitude of the initial leak
- showerhead selection
3/6/2017
Leak Rate Criteria:
Savings Factor
3/6/2017
Product and
Performance Testing
• Bath and shower diverters must conform to applicable
requirements within the ASME/CSA standard.
• Bath and shower diverters shall be tested for leakage:
– At 10 psi flowing pressure
– Measured between the diverter and the secondary
outlet at 12 inches from the diverter
– With water at 100 ± 10°F
– Measurements shall be taken for 5 minutes,
beginning 1 minute after the diverter is activated
3/6/2017
Next Steps
Water Sense is looking for more information and supporting
material for further consideration on:
• What constitutes “zero leakage”?
• How much leak tolerance is required, if any, to encompass
automatic reset diverters?
• Additional information to determine if a savings factor is
appropriate, and if so, a value for a savings factor.
• Other factors that can cause a bath and shower diverter to
leak.
• Best ways to engage the plumbing community in this
specification design process.
3/6/2017
Next Steps
• NOI can be reviewed at:
– www.epa.gov/watersense/products/bath_and_sho
wer_diverters.html
• Submit written comments to:
watersense-products@erg.com
• Draft specification anticipated in Spring/Summer 2017
3/6/2017
Contact Us
General Email: watersense@epa.gov
Comment Submission Email: watersense-products@erg.com
Website: www.epa.gov/watersense
WaterSense Helpline: (866) WTR-SENS (987-7367)
3/6/2017
Download PDF
Similar pages