Key Takeaways:
As maintenance and engineering managers continue to navigate rising operational demands, aging infrastructure and evolving sustainability goals, a major regulatory shift is on the horizon that will significantly impact the way hot water systems are designed, installed and managed in institutional and commercial facilities.
The latest commercial water-heater efficiency standards from the U.S. Department of Energy (DOE) have been postponed and are now set to take effect Oct. 6, 2027, giving managers more time to prepare for one of the most substantial industry changes in decades. The DOE announced in May that the original deadline for the standards to take effect, October 6 of this year, would be pushed back for a full year.
For facility managers, engineers and operators, the implications extend far beyond compliance, signaling a broader transformation in the way water heating systems are evaluated as critical infrastructure.
At the core of the new standards is a dramatic increase in minimum efficiency requirements.
“The federal efficiency rule will increase the minimum efficiency level of tank type from 80 percent to 95 percent thermal efficiency and 80 percent to 96 percent on commercial tankless,” says Matt Schulz, senior product manager of commercial gas at A.O. Smith. “In transitioning to these levels, manufacturers will be required to sell condensing products and non-condensing products will be phased out.”
This transition effectively makes high-efficiency condensing technology the new baseline across much of the commercial market.
While many facilities have already adopted condensing systems, the greatest impact will be felt in existing buildings. Many older facilities still rely on non-condensing equipment with atmospheric venting and will face more complex upgrade paths. Schulz says that when replacement becomes necessary, “installation upgrades will need to be done in addition to selecting high-efficiency-compliant products,” highlighting the dual challenge of equipment selection and infrastructure adaptation.
One of the most important shifts driven by the new standards is a move away from viewing water heaters as standalone pieces of equipment toward a more system-based approach.
The standards will push facilities to think “less about individual pieces of equipment and more about how the entire hot water system operates under real-world conditions,” says Marc Croce, senior product manager at AERCO. This system-level thinking is critical in healthcare and senior care facilities, where hot water is essential for sanitation, patient care and daily operations.
Cheryl Wagner, senior manager, mechanical solutions at Bradford White, says the new standards will “fundamentally change how systems are engineered.” Managers will need to consider factors such as condensate management, venting materials and advanced control systems as standard components of design. Performance expectations are also expanding.
“Performance expectations will expand beyond simple recovery to include turndown, redundancy, and precise temperature stability under continuous load,” Wagner says, underscoring the need for systems that can deliver efficiency and uninterrupted service in a 24/7 environment.
This evolution elevates water heating from a background utility to a critical, engineered asset that must integrate seamlessly with broader building systems. Wagner says systems will increasingly need to connect with building infrastructure and monitoring platforms, enabling more proactive and data-driven operations.
The leap in efficiency requirements is not incremental. It represents a fundamental shift in the types of technologies that will dominate the market. Higher efficiency is no longer limited to premium product categories and now applies across a broader range of institutional and commercial equipment, according to a shared perspective from manufacturers. This change narrows the gap between minimum compliance and best-in-class performance, raising the bar for all installations.
As a result, traditional product selection strategies are becoming obsolete.
“Facilities will need water heating systems that meet higher efficiency thresholds while still supporting high-demand periods, infection control protocols and long operating lifespans,” says Helen Ringle, product manager for domestic hot water at PVI, adding that managers must now prioritize solutions that balance efficiency with durability and real-world performance.
This shift also means that like-for-like replacements are increasingly rare. Instead, managers must evaluate entire systems, considering not only capacity but also compatibility with venting, condensate handling and controls.
“Selection becomes more system-driven rather than equipment-driven,” Wagner says, a change that requires closer collaboration between facility teams, consulting engineers and manufacturers.
Maura Keller is a freelance writer based in Plymouth, Minnesota.
What Facility Managers Need to Know About 2027 Water Heater Regulations
