68 Pa. Stat. § 399.2
The following words and phrases when used in this act shall have, unless the context clearly indicates otherwise, the meanings given to them in this section:
"Landlord ratepayer." One or more individuals or an organization listed on a gas, electric, steam or water utility's records as the party responsible for payment of the gas, electric, steam or water service provided to one or more residential units of a residential building or mobile home park of which building or mobile home park such party is not the sole occupant.
"Mobile home." A transportable, single-family dwelling unit intended for permanent occupancy and constructed as a single unit, or as two or more units designed to be joined into one integral unit capable of again being separated for repeated towing, which arrives at a site complete and ready for occupancy except for minor and incidental unpacking and assembly operations and constructed so that it may be used without a permanent foundation.
"Mobile home park." Any site, lot, field or tract of land, privately or publicly owned or operated, upon which three or more mobile homes, occupied for dwelling or sleeping purposes, are or are intended to be located.
"Municipal corporation." All cities, boroughs, towns, townships, or counties of this Commonwealth, and also any public corporation, authority, or body whatsoever created or organized under any law of this Commonwealth.
"Public utility." A municipal corporation now or hereafter owning or operating within its corporate boundaries equipment or facilities for:
"Residential building." A building containing one or more dwelling units occupied by one or more tenants, but excluding nursing homes, hotels and motels.
"Tenant." Any person or group of persons whose dwelling unit in a residential building or mobile home park is provided gas, electricity, steam or water, pursuant to a rental arrangement for such dwelling unit, mobile home or plot of ground within a mobile home park, but who is not the ratepayer of the company which supplied such gas, electricity, steam or water.
68 P.S. § 399.2