Humidifier for heating systems

Claim 1

A FURNANCE CONSTRUCTION COMPRISING A HOUSING, A COMBUSTION CHAMBER IN SAID HOUSING, SAID FURNACE HOUSING HAVING HOLLOW WALLS SURROUNDING SAID COMBUSTION CHAMBER AND DEFINING AN AIR PASSAGEWAY, A FLUE CONDUIT PASSING THROUGH SAID HOLLOW WALLS OF SAID FURNACE HOUSING AND JOINING SAID COMBUSTION CHAMBER, A BURNER IN THE LOWER PORTION OF SAID COMBUSTION CHAMBER, A BURNER IN THE LOWER CHAMBER ABOVE SAID COMBUSTION CHAMBER, A PAIR OF GENERALLY HORIZONTALLY DISPOSED LATERALLY SPACED APART HEAT EXCHANGER TUBES LYING IN A COMMON PLANE AND EXTENDING INTO SAID COMBUSTION CHAMBER IN CLOSE PROXIMITY TO AND ABOVE SAID BURNER, MEANS SUPPLYING WATER TO SOME DESIRED LEVEL IN SAID HEAT EXCHANGER TUBES, SAID MEANS SUPPLYING WATER INCLUDING A TANK POSITIONED EXTERNALLY OF SAID FURNACE HOUSING, SAID TANK HAVING A GENERALLY VERTICAL WALL THEREIN DEFINING FIRST AND SECOND SIDE-BY-SIDE HORIZONTALLY DISPOSED CHAMBERS, A WATER SUPPLY LINE LEADING TO THE FIRST OF SAID SIDE-BY-SIDE CHAMBERS IN SAID TANK, A COMBINATION FLOAT AND VALVE MEANS IN THE FIRST OF SAID SIDEBY-SIDE CHAMBERS ARRANGED AND CONSTRUCTED TO AUTOMATICALLY CONTROL THE ADMISSION OF WATER FROM SAID SUPPLY LINE TO SAID TANK, SAID GENERALLY VERTICAL WALL HAVING A