Lisowska-Lis A, Leszczyński R. Air–water heat pump applied as water boiler in single-family house, coefficient of performance analysis under the real conditions. Sci, Tech. Innov. [Internet]. 2018 Dec. 27 [cited 2024 Jul. 3];3(2):58-61. Available from: https://journals.anstar.edu.pl/index.php/sti/article/view/242