You can get an electronic version which does not need any plumbing skills as all you do is wrap a wire round the inlet pipe a dozen or so times and switch on. Apparently they work well, never need replacing and use minimal electricity. Probably good for all the other electrical appliances which use water like your kettle and washing machine.
If you travel overseas a lot where drinking water is not the norm from the tap you will see many gadgets which do need plumbing in but they not only get rid of scale but most of the other things which worry some people in our water. My apartment in Bangkok has an industrial sized one which gives you drinking water for about 2p a litre which is cheaper than bottled water which is actually very cheap to buy compared to here in the UK. Nestles or Singha bottled water only costs about 30p for 5 litres. Personally I think people are mad to pay for bottles water in the UK.
"You can get an electronic version which does not need any plumbing skills as all you do is wrap a wire round the inlet pipe a dozen or so times and switch on"
Sorry, but if these worked, then all the firms manufacturing water softeners in the world would be out of business overnight.