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Weil-McLain introduces B100 compatibility for residential oil boilers

Written on: September 19, 2025 by ICM

Supporting a more climate conscious future, hydronic comfort heating solutions manufacturer 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 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, the company said in a statement.

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.

“Weil-McLain boilers that are B100 certified are designed to operate on this blend of biodiesel fuel with the approved Beckett and Carlin burners,” said Mike Boyd, Product Manager with Weil-McLain.

“These compatible burners have seals and components designed to optimize operation when using biodiesel.”  

Using B100 with a certified oil boiler can help reduce greenhouse gas emissions because biodiesel is a cleaner-burning fuel than petroleum diesel. It 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.  

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. 

“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.”