BS IEC 60335-2-51. Household and similar electrical appliances. Safety. Part 2-51. Particular requirements for stationary circulation pumps for heating and service water installations— 15 стр.
91.140.10 Central. Including burners and boilers for central heating systems / Системы центрального отопления. Включая горелки и котлы для систем центрального отопления
