| 摘要 |
<p>A hot water storage vessel having an inlet and outlet water connection, a heat exchanger positioned outside said vessel in the connection between said inlet and outlet, said connection including an apertured body for securement to the vessel controlling the flow of water from a source of supply the vessel and the heat exchanger said apertured body including at least a cold water inlet aperture, an outlet aperture to said heat exchanger and a co-axial bore common to said apertures the bore dimension at the inlet aperture being smaller than that at the outlet, a tube positioned in said bore communicating with the inlet and outlet aperture. Also disclosed is a heat exchanger including metal fins adapted to be heated by a gas burner said fins extending substantially radially from a pipe carrying water to be heated said fins being enclosed and constructed that flue gases from the burner follow a path circumferentially around the pipe before flowing to exhaust. Also disclosed is a water connection said connection including a co-axial stepped diameter closed bore having at least two steps and adapted to open into the storage vessel, each stepped part of the bore being ported, the bore including a tubular insert extending thereinto and including a cut away or apertured portion communicating with the port associated with said intermediate bore and leaving an annular cavity communicating with the port associated with the largest stepped bore.</p> |
