Water heating stove

A water heating stove for supply of hot water to circulating hot water heating systems, comprising:

• a fire box having a fire supporting grate therein, a fuel loading aperture in a front wall thereof and a flue outlet for exit of combustion gases therefrom;
• a water jacket lining the rear and side upright walls of said fire box;
• inlet and outlet means for circulating water into and out of said water jacket;
• a fuel loading door adapted to close the fuel loading aperture to prevent ingress of combustion air through the said aperture;
• a combustion air inlet in the fire box and disposed at a level below the fuel loading door, said combustion air inlet being equipped with damper means adapted to adjust air flow therethrough, said damper controlled air inlet comprising the sole substantial inlet for combustion air to the fire box when the fuel loading door is closed;
• a bottom wall of said fire box, below the fire supporting grate, shaped to provide a lowermost zone for collection therein of liquid residues and condensates from the fire box;
• an outlet conduit having an inner end communicating with said lowermost zone inside the fire box and an outer end disposed exterially of the fire box and at a level below that of the inner end;
• a water trap into which the outer end of said outlet conduit protrudes, said outer end being disposed below the water level in said water trap, substantially to prevent acess of air to the fire box through said outlet conduit.