This mark indicates that the product has been certified by the Japan Gas Appliances Inspection Association (LP/12A/13A only).
Empty shutoff: Shuts off the flow of gas immediately if the boiler becomes hot because it is operating empty.
(Sankyu Boiler Type 1/2)
Flameout shutoff: Shuts off the flow of gas immediately if a sensor indicates that the burner fails to reach a certain temperature.
(Sankyu Boiler Type 1/2)