Ten Things to Know About DHW Return Design

0:00 Intro
7:50 Parallel piping systems and fluid dynamics
19:28 Recirculating vs. circulating
24:23 Automatic vs. manual balancing valves
32:42 Digital point of distribution mixing valve Standard IGC 384 - IAPMO/ASSE/ANSI 1118-202x
35:00 Right-sizing hot water supply systems
46:41 Professional credentials - ASPE/IAPMO/ANSI Series 12000-2021
51:01 Testing and balancing
52:25 ASPE 99 Thermal Disinfection Standard development
53:03 Domestic hot water recirculation pumps
59:14 Why plumbing expertise matters for innovation
1:04:12 Q&A

Technical Content Level: Intermediate

Domestic hot water (DHW) design is critical to optimize energy efficiency, while reducing water waste. Host Christoph Lohr P.E. will detail the policies, standards, and credentials that can help designers and installers navigate the waters. He will discuss ten critical issues related to DHW design:

→ Definition: Recirculating vs. Circulating
→ Automatic Balancing Valves vs. Manual Balancing Valves
→ ASSE/IAPMO IGC Standard 368 for thermostatic balancing valves and IAPMO/ASSE/ANSI 1115-202x for Automatic Balancing Valves
→ Digital Master Mixing Valve Standard IGC 384 (IAPMO/ASSE/ANSI 1118-202x)
→ Right Sizing Hot Water Supply Systems (Water Demand Calculator)
→ Right Sizing Hot Water Return Systems (Hardy Cross Methodology)
→ ASSE 12000 Series Credential
→ Testing and Balancing/Commissioning of hot water systems
→ ASPE 99 Thermal Disinfection Standard Development
→ Hot Water Return Pump: UPC Code Update

Christoph is IAPMO’s Vice President of Technical Services and Research. As part of his duties he provides industry leadership through participation in strategic industry initiatives, and provides technical support to all IAPMO’s business units as needed. Christoph has over a decade of experience in designing plumbing systems and has a reputation as a results-oriented expert, particularly in the realm of balancing waterborne pathogen prevention and water sustainability. He is a distinguished graduate from the Virginia Military Institute, with a Bachelor of Science in Mechanical Engineering.

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