Prevention or reduction of scaling on a heater element of a water heater
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United States of America Patent
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May 24, 2016
Grant Date -
Apr 11, 2013
app pub date -
Jul 13, 2011
filing date -
Jul 22, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a method of using a water heater arranged for heating an aqueous liquid wherein the water heater comprises a heating element to heat aqueous liquid in the water heater. The method comprising (a) heating aqueous liquid in the water heater with the heating element, wherein the heating element is in contact with the aqueous liquid; and (b) applying a first AC voltage between the heating element and a counter electrode and applying a second AC voltage between the heating element and the counter electrode, wherein the second AC voltage has a second AC frequency selected from the range of 0.02 Hz-5 Hz and wherein the ratio between the first AC frequency and the second AC frequency is 2 or more.
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