20.__Metal halide lamp fixture.__"Metal halide lamp fixture" means a light fixture designed to be operated with a metal halide lamp and a ballast for a metal halide lamp.

21.__Probe-start metal halide ballast.__"Probe-start metal halide ballast" means a ballast used to operate metal halide lamps that does not contain an ignitor and instead starts lamps by using a 3rd starting electrode "probe" in the arc tube.

22.__Pulldown refrigerator.__"Pulldown refrigerator" means a commercial refrigerator specifically designed to rapidly reduce, when fully loaded with beverage containers, all integrated product temperatures from 90 degrees Fahrenheit to 38 degrees Fahrenheit over a 12-hour period.

23.__Residential boiler.__"Residential boiler" means a self- contained appliance for supplying steam or hot water primarily intended for space heating that uses only single-phase electric current or single-phase electric current or direct current in conjunction with natural gas, propane or home heating oil and that:

A.__Is designed to be the principal heating source for the living space of one or more__residences;

B.__Has a heat input rate of less than 300,000 BTUs per hour; and

C.__Is not an appliance designed for the primary purpose of supplying hot water for purposes other than heating.

24.__Residential furnace.__"Residential furnace" means a self- contained space heater designed to supply heated air through ducts of more than 10 inches in length that uses only single- phase electric current or single-phase electric current or direct current in conjunction with natural gas, propane or home heating oil and that:

A.__Is designed to be the principal heating source for the living space of one or more residences;

B.__Is not contained within the same cabinet as a central air conditioner whose rated cooling capacity is above 65,000 BTUs per hour; and