Hot water tank and controller therefor

摘要

A hot water tank and method for estimating an available quantity of usable water having a desired water temperature therein, the tank being fed by cold water heated by a controllable heating element containing an electrically conductive wall, a heating element and at least three temperature sensors disposed at respective heights of the tank for measuring local water temperature at respective points thereof. Each of the temperature sensors is an electrical conductor formed of a material different to that of the electrically conductive wall of the tank and which is bonded to the wall so as to form a thermocouple at a respective point of contact.