No permits shall be issued by the city for installation or connection for use of any gas-fired apparatus or equipment (except domestic ranges, refrigerators, water heaters or any gas equipment of less than 50,000 BTU per hour) supplied from the general gas distribution system of the Northern States Power Company located within the city, unless the application is accompanied by a statement from the power company stating that it has the facilities and capacity to serve the equipment or apparatus at the location designated.
(`89 Code, § 22.060)