On May 15th of 2020, EPA regulations took effect requiring solid fuel heaters (wood stove, fireplaces, and inserts) to emit less than 2 grams/ hour of soot when tested according to new standards, known as New Source Performance Standards (NSPS). These clean air standards are intended to make new heaters significantly cleaner and improve air quality in communities where people burn wood for heat.
This rule has given HearthStone the opportunity to take a leadership position and develop some of the cleanest, most efficient stoves in existence today. All of our wood burning products use secondary combustion to burn the gases given off by the wood fuel. Secondary combustion is visible as flames dancing above the wood, below the baffle.
Our TruHybrid™ technology is a breakthrough with measured efficiencies up to 81% and emissions down to 1/2 gram per hour. The TruHybrid™ system adds tertiary combustion, using a catalytic combustor to burn any remaining particulates and gases, resulting in a clear, smokeless exhaust from your chimney.
All products currently available in stores must meet the 2020 EPA standards. Stoves that are already installed in homes, are still perfectly legal.
Visit the EPA website to learn more: https://www.epa.gov/residential-wood-heaters