Learn how commercial boiler system design, condensing boilers, outdoor air reset controls, and modular systems can improve efficiency, reduce operating costs, and support long-term building performance.
Boiler systems play a critical role in the operation of many commercial and institutional buildings. Whether you’re planning a replacement, upgrading an existing system, or evaluating opportunities to improve efficiency, proper system design and equipment selection can significantly impact operating costs, maintenance requirements, and long-term performance.
Many facilities serve multiple heating loads that vary throughout the year. Understanding those loads, distribution systems, and operating requirements is an important first step in selecting and operating equipment efficiently. Vermont Gas can help identify opportunities to improve system performance and support informed equipment decisions.
A boiler’s performance depends on more than the equipment itself. System design, operating temperatures, controls, and load management all influence efficiency and overall building performance.
Conventional boilers lose efficiency as heat exits through exhaust gases. Condensing boilers capture a portion of that heat and use it to preheat returning water, allowing properly designed systems to operate at significantly higher efficiencies. In some applications, condensing boiler systems can achieve efficiencies approaching 99%.
Working with a qualified contractor or engineer can help ensure equipment is properly sized and configured to meet your facility’s needs while maximizing performance.
Facilities can often achieve meaningful energy savings without completely replacing existing heating systems. Operational improvements, control strategies, and targeted equipment upgrades can help improve efficiency, reduce operating costs, and support reliable performance across a wide range of heating loads. Explore the opportunities below to learn how these approaches may benefit your facility.
ENERGY STAR-certified condensing boilers offer a minimum thermal efficiency of 94% and are designed to operate efficiently across a wide range of heating loads. Their ability to maintain operation at lower firing rates helps reduce cycling, improve reliability, and support long-term equipment performance.
Building heating needs change constantly as outdoor temperatures fluctuate. Outdoor air reset controls automatically adjust supply water temperatures based on conditions, helping boiler systems operate more efficiently while maintaining occupant comfort. These controls also support condensing boiler performance by helping maintain lower return water temperatures.
Delta T refers to the difference between supply-water and return-water temperatures in a hydronic heating system.
Increasing Delta T can reduce pumping energy requirements while helping maintain lower return-water temperatures. This supports more efficient boiler operation and improved overall system performance. In some applications, equipment upgrades such as semi-instantaneous water heaters may also help reduce standby losses and improve efficiency.
Facilities do not always need to replace existing systems all at once. In some cases, adding a smaller modulating condensing boiler to an existing system can improve efficiency during periods of lower demand.
Modular boiler configurations can also provide operational flexibility, allowing individual boilers to operate efficiently at varying loads while maintaining redundancy during service or maintenance events. These systems can be particularly effective when space is limited or building loads fluctuate throughout the year.
Explore technical guides, best practices, and industry resources related to boiler design, operation, and efficiency improvements.
