GSA’s 2024 P100 requires electrification for any new or replacement HVAC or domestic water heating equipment. Equipment that uses steam, hot water, or chilled water from a conventional fuel–burning source, need an approved P100 waiver. If receiving a waiver, condensing boilers are recommended over conventional gas boilers.
Condensing boilers are more efficient because they capture the heat that conventional boilers lose through steam. Researchers from the Pacific Northwest National Laboratory (PNNL) and the National Renewable Energy Laboratory (NREL) evaluated condensing boilers at two locations. Savings ranged between 14% and 24%.
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