I think you need to put the heater in a smaller container of water to
test it, something like a large glass vase. This will give you faster
feedback as to which way is ON. I fill the sink with water and put
the heater completely underwater. For smaller heaters, you can leave
your hand on the elements (ie:100W), for larger heaters, you have to
touch lightly and quickly (or watch for the heat ripples in the
water). hth
NetMax
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