N.Y.C. Admin. Code § 24-149.1: § 24-149.1 Outdoor wood boilers.

(a) No person shall burn any fuel in an outdoor wood boiler except clean wood, provided that newspaper or other non-glossy, non-colored paper may be used as starter fuel.

(b) No person shall operate an outdoor wood boiler so as to cause an emission that (1) activates a smoke detector on an adjoining property; (2) impairs visibility on a public street or highway; or (3) causes a visible plume that comes into contact with a building on an adjacent property.

(c) No person shall operate an outdoor wood boiler with a thermal output rating of two hundred fifty thousand Btu/h or less, unless such outdoor wood boiler:

(1) Is in compliance with all applicable certification standards set forth in section 247.8 of title six of the New York codes, rules and regulations;

(2) Is located at least one hundred feet from the nearest property boundary line; and

(3) Is equipped with a permanent stack extending at least eighteen feet above ground level.

(d) No person shall operate an outdoor wood boiler with a thermal output rating in excess of two hundred fifty thousand Btu/h.