Requires electric public utilities and gas public utilities to implement or maintain public utility warranty programs that cover full cost to repair or replace covered appliances.

S 4478 requires New Jersey's electric and gas public utilities to create or maintain warranty programs covering the full cost to repair or replace specific household appliances. Covered appliances include furnaces, water heaters, HVAC systems, refrigerators, stoves, washers, dryers, and similar items. Utilities must notify all customers about the program via bill inserts every billing cycle for one year after the law takes effect, explaining their rights and how to switch from existing programs. The bill also prohibits utilities from passing on the cost of these programs to customers through higher rates. This law directly affects residential utility customers and the state's electric and gas utility providers.