Scambiatore primario per caldaie Riello articolo compatibile con modelli: Benefit 20/20 IS/20 K/20 KI/20 KF/20 KS/20 KIS, Benessere 24 KI/KIS, Colonna 80 24/ISCM, Externa 20 K/20 KS/20 KIS, Residence 24 I/24 IS/24 K/24 KI/24 KF/24 KIF/24 KS/24 KIS, Salvaspazio 24 KI/24 KIS