To properly define and distinguish between decorative hearth products and vented hearth heaters.

“(67) Vented hearth heater—The term “vented hearth heater” means a vented gas fireplace, vented fireplace insert, or vented stove—

“(A) for which any AFUE representation, or representation with respect to P.4 efficiencies required for products sold in Canada, is made in any manufacturer advertising or literature;

“(B) that is certified to the ANSI Z21.88 standard or identified in any manufacturer literature or advertising as a “heater-rated” product; or

“(C) that is equipped by the manufacturer with a thermostatic control.

“(68) Decorative hearth product—The term “decorative hearth product” means a vented gas fireplace, vented fireplace insert, vented stove, or vented gas log set that—

“(A) is not certified to the ANSI Z21.88 standard and, in the case of a vented gas fireplace, vented fireplace insert, or vented stove, is certified to the ANSI Z21.50 standard;

“(B) is sold without a thermostat and with a warranty provision expressly voiding all manufacturer warranties in the event the product is used with a thermostat; and

“(C) contains no energy efficiency representations other than P.4 efficiencies required for products sold in Canada.”