| 摘要 |
Disclosed is a water heating system with a hot water storage tank having a first port located in a lower region of the tank and a second port located in an upper region of the tank; a water flow pathway extending from the first port through a heating chamber to the second port; electrical heating means (for example a heating element) arranged to heat water within the heating chamber, when required, so that water within the water heating system will circulate from the first port to the second port through the heating chamber, by convection, when water is not drawn from the water heating system; a water supply outlet communicating with the water flow pathway intermediate the heating chamber and the second port; and a check valve arranged to restrict the flow of water out of the hot water storage tank by way of the second port. |
