NF P52-100-2*NF EN 16297-2:2012 Pumps - Rotodynamic pumps - Glandless circulators - Part 2: calculation of energy efficiency index (EEI) for standalone circulators
2006NF P52-101-1:2006 Pumps - Rotodynamic pumps - Circulation pumps having a rated power input not exceeding 200 W for heating installations and domestic hot water installations - Part 1 : Non-automatic pumps, requirements, testing, marking.