Weil-McLain Introduces B100 Compatibility for Residential Oil Boilers

Burr Ridge, Ill. – September 17, 2025 – Paving the way for a more climate conscious future, hydronic comfort heating solutions leader Weil-McLain^® has announced that its Ultra^® Oil, WGO, WTGO and SGO residential oil boilers are now certified for use with biofuel blends up to 100% (B100). This achievement has been made possible through collaboration with industry leaders R.W. Beckett and Carlin Combustion, as Weil-McLain validates the adaptability of their burners to the elevated blend of biofuel when combined with its popular oil-fired boiler product lines. This advancement underscores Weil-McLain’s commitment to delivering sustainable heating options and driving environmental progress in the industry.

A B100 compatible boiler is one that operates with a fuel blend consisting of 100% biodiesel. Biodiesel is a renewable fuel made from organic materials such as plant and vegetable oils, animal fats and used cooking oils.

Climate Conscious Solutions

Using B100 with a certified oil boiler can help reduce greenhouse gas emissions because biodiesel is a cleaner-burning fuel than petroleum diesel that can provide similar performance while significantly limiting how much carbon dioxide is released into the air. Other benefits of using a B100 certified boiler include:  

• Renewable energy source: Biodiesel is made from renewable sources, meaning it can be continually produced by a steady supply of raw materials. By utilizing biodiesel in a B100 blend, the dependence on finite fossil fuel resources can be reduced. 
• Energy security: Incorporating biodiesel into a fuel mix diversifies energy sources and reduces dependence on foreign oils and petroleum. This can contribute to enhancing energy security and reducing vulnerability to supply disruptions.
• Government incentives: In some regions, there may be government incentives, grants or tax credits available for using biodiesel.  

“Our new B100 certified boilers mark an important milestone in our commitment to a sustainable future,” added Boyd. “By embracing biodiesel technology, we are not only reducing carbon emissions and environmental impact, but also paving the way for a more resilient and renewable energy landscape. This exciting development highlights our dedication to innovation and positions us as a leader in providing energy-efficient solutions that shape the future of heating while making a positive impact on the planet.”  

In addition to these benefits, homeowners interested in upgrading to one of these units can reap the rewards of a federal tax credit. Weil-McLain is a Qualified Manufacturer (QM), and its residential oil water boilers with an 87% AFUE rating installed between January 1, 2025, and December 31, 2025, can be claimed for up to $600 after meeting federal requirements. Eligible homeowners must include the four-digit QM code of “46H2” when completing their taxes for 2025 using tax form IRS Form 5695, Residential Energy Credits (the QM code may be used in lieu of a product identification number (PIN)). This tax credit can also be used in conjunction with any local ENERGY STAR^® rebate programs. 

Versatile Applications

Weil-McLain’s oil-fired boilers are an ideal solution for residential applications. Available for both water and steam systems, these high-efficiency units are rugged and reliable – providing peace of mind comfort heating for years to come. And with AFUE ratings of 85% to 87%, they all can significantly reduce energy waste while providing fuel cost savings. The Ultra Oil is the industry’s premium “commercial-grade” residential boiler featuring an easy-to-clean, three-pass heat exchanger. The WTGO is the perfect boiler for customers seeking an “all-in-one” space and domestic hot water heating appliance, while the SGO (steam) and WGO (water) are great for easy inspection and service due to their quick-open tops and swing-away burner doors that provide full chamber access.

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About Weil-McLain

Weil-McLain^® is a leading North American brand of hydronic comfort heating systems for residential, commercial, and institutional buildings since 1881. Known for innovation and reliability, Weil-McLain is committed to delivering high-efficiency heating solutions that prioritize comfort, energy savings, and sustainability. Weil-McLain continues to serve as a trusted partner by providing Solutions that Matter™ for the diverse needs of contractors, engineers, architects, homeowners, and facility managers, where products are trusted in homes, offices, schools, restaurants, hotels, and more throughout North America.

WM Technologies, LLC, assembles, sells, and distributes Weil-McLain boilers from Eden, North Carolina, and manufacturers cast iron products in Michigan City, Indiana, with approximately 600 employees across manufacturing facilities, sales locations, and administrative offices in Burr Ridge, Illinois. Backed by the global strength of SPX Technologies Inc, WM Technologies, LLC is dedicated to driving industry innovation and advancing climate-conscious heating solutions. For more information, visit www.weil-mclain.com.