Right-Sizing Residential Plumbing with the Water Demand Calculator
California's Water Demand Calculator (WDC) is changing the way residential plumbing systems are designed. Now incorporated into the California Plumbing Code (Appendix M), the WDC replaces outdated sizing methods based on decades-old assumptions with a modern, data-driven approach that reflects today's fixtures and water use patterns.
Join nationally recognized plumbing and energy efficiency expert Gary Klein for a practical training on how right-sizing plumbing systems can improve building performance while reducing construction costs, water waste, energy use, and carbon emissions. You'll learn how properly sized hot and cold water distribution systems can deliver hot water faster, reduce water stagnation, improve water quality, and lower utility costs throughout the life of a building.
Whether you're designing single-family homes, multifamily housing, or mixed-use residential projects, this course will help you understand when and how to apply the Water Demand Calculator to create healthier, more efficient, and code-compliant plumbing systems.
Register Here!
Learning Objectives
During this course, participants will learn how to:
Compare traditional plumbing sizing methods with the Water Demand Calculator and understand when each approach is appropriate.
Evaluate how right-sized plumbing systems can reduce construction costs, water consumption, energy use, and carbon emissions.
Understand how properly sized plumbing systems improve water quality, reduce water aging, and minimize public health risks.
Identify tools and resources to confidently apply the Water Demand Calculator on future residential and multifamily projects.
About the Speaker
Gary Klein is President of Gary Klein & Associates and has been a nationally recognized leader in energy efficiency, water conservation, and sustainable plumbing design for more than 40 years. A former California Energy Commission staff member, Gary has dedicated his career to improving how buildings deliver hot water—helping architects, engineers, and builders create plumbing systems that are more efficient, cost-effective, and environmentally responsible. His work has influenced building codes and best practices across the country, making him one of the leading experts in hot water system design and plumbing efficiency.