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On March 16, 2015, EPA published a final rule that made revisions to the New Source Performance Standards (NSPS) for new residential wood heaters. The 2015 final rule updated the 1988 NSPS to reflect significant advancements in wood heater technologies and design, broadened the range of residential wood-heating appliances covered by the regulation, and improved and streamlined implementation procedures. The 2015 rule requires manufacturers to redesign wood heaters to be cleaner and lower emitting. In general, the design changes also make the heaters perform better and more efficiently. On November 30, 2018, EPA published an Advance Notice of Proposed Rulemaking (ANPRM) to solicit comment on several aspects of the 2015 final rule, including: the compliance date for the Step 2 PM limits (while part of the ANPRM, the compliance date will not be part of the proposal); Step 2 PM limits for forced-air furnaces, hydronic heaters, and wood stoves; Step 2 PM limits based on weighted averages versus individual burn rates; transitioning to cord wood certification test methods; compliance audit testing; third-party review; electronic reporting; and warranty requirements. On April 2, 2020, EPA finalized the rule that was proposed on November 30, 2018. The final rule addressed minimum pellet requirements and other issues identified in the proposed rule. At this time, no regulatory development is anticipated until the new emission test method has been promulgated for wood heaters; the target date for promulgation of the new test method is probably late FY 2025/early FY 2026.