ISO 23550:2011 Safety and control devices for gas burners and gas-burning appliances - General requirements
BS ISO 23551-9:2015 history
2022BS ISO 23551-9:2022 Safety and control devices for gas burners and gas-burning appliances. Particular requirements. Part 9: Mechanical gas thermostats
2015BS ISO 23551-9:2015 Safety and control devices for gas burners and gas-burning appliances. Particular requirements. Mechanical gas thermostats