Electrification of Domestic Hot Water is a Tough Nut to Crack

Electrifying domestic hot water (DHW) in multifamily buildings is a tough nut to crack—and one of the most critical challenges on the path to low- and zero-carbon buildings. Join James Petersen, P.E., Founder & Principal at Petersen Engineering and President of the PHMass Board to explore the current landscape of electric DHW solutions for large multifamily projects, with a clear-eyed look at what works, what doesn’t, and where the real tradeoffs lie. Through real-world case studies, the presentation will examine system types, costs, sizing strategies, energy use, embodied carbon, mechanical space demands, metering approaches, and ongoing maintenance considerations.

James’ slides can be downloaded here.

This event took place on February 10, 2026 at the BSA Space in Boston, MA. It was supported by the Sponsors of Mass Save.