Hot water on tap

摘要

Do you remember the time when you had to wait for the kettle or urn to boil before getting your morning cuppa at the office? Then Zip Heaters' instant boiling water heater changed everything. Suddenly you could get instant boiling water without waiting. Around 1975 David Davis patented the instant boiling water heater for the office environment. The patented Zip water heater included a heating element A located in a water reservoir B (see illustration). A vertically movable spindle C is supported in the reservoir B and has at one end a disc D to activate a pair of micro switches E, F. When there is no water in the reservoir B, a float G, movable along the spindle C, is located in the lower position as shown. The disc D contacts the lower micro switch E, breaking a circuit with the heater element A. When the circuit is activated, a water inlet control valve solenoid H is energised permitting water to flow into a second reservoir J before moving into reservoir B by way of tube L.