UL Solutions introduces hydrogen blending certification for gas-fired boilers

The bi-national standard sets a new industry benchmark for boilers using hydrogen blending up to 25 percent, covering gas-fired package boilers, high-pressure steam and water gas-fired boiler assemblies.

UL Solutions published the ninth edition of UL 795, the Standard for Commercial-Industrial Gas-Fired Package Boilers, in February 2024. This bi-national standard, ANSI/CAN/UL 795:2024, is the first North American standard to allow certification for boilers using hydrogen blending up to 25%, setting a new industry benchmark.

UL 795 provides a certification path for hydrogen-natural gas blends, as well as other traditional fuel types within its scope. The new edition includes requirements for:

Gas-fired package boilers. High-pressure steam and high-temperature water gas-fired boiler assemblies for the following fuel gases: natural gas, hydrogen-natural gas blends, LP-gas, LP-gas/air blends, and manufactured gas, Furnaces, Air heaters (United States only).

The full Standard is available in the UL Standards Catalog.

As new technologies have diversified industrial and commercial boiler products over the years, the need to address different certification paths for additional fuel sources and blends has come into focus. The original edition of the UL 795 Standard, first published in 1952, has been modified many times over the years to accommodate changes to the industry and manufacturers’ needs.

UL Standards & Engagement, the publisher of the UL 795 Standard, is accredited by the American National Standards Institute (ANSI) and the Standards Council of Canada (SCC) as a Standards Development Organisation. The ninth edition of the Standard, based on the eighth edition of UL 795 and the first edition of ULC/ORD-C795-2021, supersedes the previous editions.

UL Solutions, a pioneer in the combustion industry, can review boiler listings to ensure they meet new requirements or initiate new quotes. Their dedicated laboratory staff can assist users in testing and certification.