In larger domestic hot water applications, we often see centralized water heating lineups with or without storage tank equipment to produce and distribute domestic hot water inside buildings and facilities. I often see these more robust systems in healthcare projects, numerous hospitality (hotel) projects as well as some multifamily installations when energy metering is not required for hot water serving the units (apartments). During the design phase, I take a keen interest in analyzing the approach to domestic hot water delivery, the equipment involved, the methods for hot water return and how these systems are represented in design for the specific project. I’m looking for system specifics shown in plan view layouts and system details or schematics that provide all pipe sizing and system configuration for a complete and proper installation.
Too often there are notes with keynotes like “install in accordance with the manufacturer's guidelines.” This is a good reference point to include in the final design deliverable for installation, although, in many instances, I find that we actually are installing basis-of-design (BOD) equipment and design details don’t align with the manufacturer’s details. More diligence is warranted. Providing the proper design details using the BOD manufacturer’s information better prepares the installer and helps avoid systems that do not perform properly under peak load conditions.