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Many thanks for your replies, some are quite good and could be useful. What I was really looking for is non invasive. To my thinking if its switched on, then there is current flowing. In that case a device which slips a coil around the wire which should give me an induced current in the coil...

I understand that the objective here is to find out things one does not know, if you have nothing constructive, just childish remarks, use twitter

I have a 30 gallon hot water tank in a cupboard. The switch to switch it on and off is inside the cupboard. I only use the water in the tank for washing up. But herein is the difficulty, I tend to forget that it is switched on and keeping a 30 gallon tank constantly hot unnecessarily is...