IS 15558 is an Indian Standard specified by the Bureau of Indian Standards (BIS) for domestic gas stoves for use with Liquefied Petroleum Gas (LPG). Any business that wishes to import gas stoves into India must obtain BIS registration under this standard to ensure the products meet the country’s safety and performance requirements. https://www.agileregulatory.com/blogs/bis-isi-for-domestic-water-heater-instantaneous-for-use-with-lpg-is-15558-2005