Combination water and space heater

Claim 1

AN IMPROVED COMBINATION SPACE AND WATER HEATING APPARATUS WHICH COMPRISES: A HOT WATER TANK DEFINED BY TOP, BOTTOM AND CYLINDRICAL SIDE WALLS AND COMPRISING COLD WATER INLET MEANS AND HOT WATER OUTLET MEANS, SAID TANK HAVING A NORMALLY VERTICAL AXIS; A FUEL COMBUSTION CHAMBER DEFINED BY TOP, BOTTOM AND CYLINDRICAL SIDE WALLS, SAID CHAMBER HAVING A NORMALLY VERTICAL AXIS COINCIDENT WITH SAID AXIS OF SAID TANK, SAID TOP WALL BEING BELOW SAID BOTTOM WALL OF SAID TANK AND SPACED THEREFROM, THE SPACE BETWEEN SAID BOTTOM WALL OF SAID TANK AND SAID TOP WALL OF SAID FUEL COMBUSTION CHAMBER FORMING AN AIR HEATING CHAMBER; A HOUSING COMPRISING A TOP WALL AND A CYLINDIRCAL SIDE WALL SURROUNDING SAID TANK, SAID HOUSING HAVING A NORMALLY VERTICAL AXIS COINCIDENT WITH SAID AXIS OF SAID TANK, SAID TOP WALL OF SAID HOUSING BEING SPACED FROM SAID TOP WALL OF SAID TANK AND SAID SIDE WALL OF SAID HOUSING BEING SPACED FROM SAID SIDE WALL OF SAID TANK, WHEREBY THERE IS PROVIDED AIR SPACE BETWEEN THE TOP AND SIDE WALLS OF SAID HOUSING AND THE TOP AND SIDE WALLS OF SAID TANK AND AT LEAST SAID SIDE WALL OF SAID FUEL COMBUSTION CHAMBER IN THE REGION OF SAID TOP WALL THEREOF, SAID AIR SPACE BEING IN AIR FLOW COMMUNICATION WITH SAID AIR HEATING CHAMBER, SAID HOUSING FURTHER COMPRISING BOTTOM CLOSURE MEANS IN COMBINATION WITH SAID SIDE WALL OF SAID FUEL COMBUSTION CHAMBER, WHICH BOTTOM CLOSURE MEANS ENCLOSE SAID AIR SPACE AT THE NORMALLY BOTTOM END THEREOF;