JIS A 1621:2020

This Japanese Industrial Standard specifies the measuring methods for indoor test of hot water supply efficiency using the hot water supply standard usage mode of the liquid heat collection type and the air heat collection type, and the space heating efficiency of air heat collection type among solar heating systems composed of a solar collector, solar storage tank, auxiliary heat source, etc. mainly used for hot water supply and space heating in general households (hereafter referred to as systems).