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Indiana Joins the Clean Air Movement

With the EPA’s Residential Wood Heater New Source Performance Standard (NSPS) now on the horizon, the State of Indiana has joined with many states in regulating outdoor hydronic heaters (also referred to as outdoor wood boiler or outdoor wood furnace). On May 18th, Indiana’s first rules regulating the sale, installation and operation of outdoor wood furnaces became law. The rules affect an estimated 8,000 Indiana residents who currently use an outdoor wood furnace to heat their home.

So, if you are an Indiana resident and either own or plan to purchase an outdoor wood boiler, here is a summary of some of the major elements of the adopted regulation 326 IAC 4-3.

  • emission limits for new units must meet EPA Phase 2 standards,
  • existing non-EPA qualified units must limit their operation to the heating season (October 1 – April 30),
  • increasing the stack height for certain existing units, and
  • notice requirements for sellers of outdoor hydronic heaters.

For additional information on this regulation, please visit the Indiana Department of Environmental Regulation website for outdoor hydronic heater regulations. A copy of the entire rule is available here or IDEM provides a fact sheet for more concise reading about the outdoor wood furnace rule.

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