Initially it was considered a rather inefficient method because up to 65% of the initial energy was lost. However, the advances made in improving its efficiency and the large scale use of renewable energy has made this a very valid option.
Inicialmente se consideraba un método poco eficiente porque se perdía un 65% de la energía original. Sin embargo, los avances realizados para la mejora de su eficiencia y el uso a gran escala de energías renovables, ha hecho de este sistema una opción muy válida.