LBNL showerhead presentation-12-15-05.ppt [Read

LBNL showerhead presentation-12-15-05.ppt [Read
Current Market Trends and Potential Loss of Savings
Peter Biermayer
CEC Showerhead Workshop
December 15, 2005
Supported by CUWCC
What is this slide show about?
• Create awareness of new trends in shower
designs that influence the usage of water and
• Present terminology of new shower systems
• Provide background information on regulations &
• Order of magnitude of the effect
• Discuss next steps
• Trends in shower design are to design systems
and showerheads that may use more water than
regulations permit
—high flow showerheads advertised on the web
—By having more than one showerhead
—By having “body spas”
Epact –Federal Energy Policy Act of 1992
• No more than 2.5 gpm at 80 psig
Test procedure in DOE references ANSI / ASME
• California – CEC
— Lists self reported values
Types of Showerheads
Single head
Multiple head
— Rain shower, downpour
Shower panel / shower tower
Body spas
— Recirculating
— Non-recirculating
Rain systems
Water Tile
Single Head
Multiple head
Cascade / Downpour
Becoming more popular > 15% of the market
Shower panel or shower tower
Body Spa
Body Spa with recirculation
Rain System
Water Tile
• Cascade systems becoming more popular- 15%
of market
• Tankless water heaters make high flow systems
possible without running out of hot water
• Hotel chains test showerheads to provide
customers with shower satisfaction
If more than one showerhead per shut off valve and flow is
greater than 2.5 gpm at 80 psig – does this violate the
building code?
Clarify the law. Is it permissible to have multiple
showerheads on one valve if the total flow is greater than
2.5 gpm?
Is a body spa a shower?
— If not – should it be regulated
— What if it recirculates, can the showerhead then have a
higher flow rate?
Will those systems with large flows need extra large
capacity water heaters, instantaneous water heaters?
Are these Title 20 or Title 24 issues?
• How many showerheads are not in compliance?
• Is testing needed?
• Is better enforcement needed?
• How much water and energy could be saved?
• Are recent trends a problem?
— If yes, what should be done about it?
Report ranking potential savings
Percent Water
Counteract trend toward
multiple showerheads, etc.
Reduce average showering time
by 1 minute
Change all the showerheads
that meet code to below code
Change all showerheads that
exceed code to meet code
Reduce number of showerheads
tampered with
Reduce tub spout leakage
Details in report: Potential Water and Energy Savings from Showerheads, Peter Biermayer
Tampering & Non-compliance
Some web sites and
product instruction sheets
tell you how to remove the
flow restrictor to increase
the flow
Some web sites advertise
flow greater than 2.5 gpm
Some ideas for potential research
Performance & Efficiency Testing
— Rate performance of showerheads by objective repeatable
testing (coverage, temperature, force)
— Allows choice of water saving showerheads without
sacrificing shower experience
Safety Testing
— Low flow showerheads and sudden temperature changes due
to change in water pressure
— Temporary shutoff valves
Evaluation of Human Factors Affecting Energy & Water Use
— Relationship between temperature and water flow
See Proposal for Showerhead Testing and Evaluation for details
Showerhead performance metric
• Metric can include:
— Temperature
— Pressure
— Spray pattern
• Metric should be researched – requires testing
• Additional testing for
— Flow rate compliance
— Safety
— Tub spouts
— Basic data from field testing
— Test different types of showerheads
Linkages between Research,
Conservation Programs and Results
Performance &
Flow Testing
Tub Spout
Human Factors
Safety Testing
Market Transformaton Programs
(may include financial incentives, special promotions, education, and
voluntary and mandatory standards)
Don't promote
unacceptable to
the consumer
(may result in
tampering or
Reduce desire
for multiple
Save Water &
Utility Customers
are Happy
For More Information
Peter Biermayer
— (510) 486-5983
Camilla Dunham Whitehead
— (207) 228-3573
WETT - Water and Energy Technology Team (LBNL)
— Web site:
Report: Potential Water and Energy Savings from Showerheads
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