"Seasoned wood" means wood that has a moisture content of less than or equal to 25%.
"Sole source of heat" means the solid fuel burning device is the only available source of heat for the entire residence, except for small portable heaters.
"Solid fuel burning device" means fireplaces, wood stoves and boilers used for burning wood, coal, or any other nongaseous and non-liquid fuel, both indoors and outdoors, but excluding outdoor wood boilers, which are regulated under R307-208.
Utah Admin. Code R307-302-1