Balancing fittings in a water heating system Olesya Averyanova, Aleksandra Amelina, Pavel Amelin, Aleksandra Makeeva, Sergej Manovitskij and Ernest Ivanov E3S Web Conf., 140 (2019) 04006 Published online: 18 December 2019 DOI: 10.1051/e3sconf/201914004006