BS EN 303-6:2019 Heating boilers Heating boilers with forced draught burners. Specific requirements for the domestic hot water operation and energy performance of water heaters and combination boilers with atomizing oil burners of nominal heat input not exceeding 70 kW

Temperature measurement
Pressure testing
Hot-water boilers
Domestic
Burners
Heating equipment
Type testing
Efficiency
Instructions for use
Forced-draught burners
Hot-water supply systems
Temperature-rise limit
Testing conditions
Storage water heaters
Marking
Boilers
Mathematical calculations
Water heaters
Fitness for purpose
Safety measures
Performance testing
Temperature
Instantaneous water heaters

Link: BS EN 303-6:2019 Heating boilers Heating boilers with forced draught burners. Specific requirements for the domestic hot water operation and energy performance of water heaters and combination boilers with atomizing oil burners of nominal heat input not exceeding 70 kW
Source: BSI Standards