As the United States moves to decarbonize commercial and residential building structures, all eyes turn to heat pumps as a way to increase energy efficiency and reduce carbon emissions for not only space heating but domestic hot water as well. This month, Plumbing & Mechanical Chief Editor Nicole Krawcke had a chance to sit down with Cain White, director of commercial product management for Mitsubishi Electric Trane HVAC US LLC (METUS), about commercial water heating trends, including heat pump water heaters.