TY - JOUR AU - Schumm, G. AU - Philipp, M. AU - Schlosser, Florian AU - Hesselbach, J. AU - Walmsley, T. G. AU - Atkins, M. J. ID - 24637 JF - Energy Efficiency SN - 1570-646X TI - Hybrid heating system for increased energy efficiency and flexible control of low temperature heat ER -