Eco-Friendly Shower Calls To Mind a Basic Question

I’ve been in correspondence with a fellow in the UK about his invention: an eco-friendly shower using electrically heated water.  The good news: it uses 80% less  energy and 80% less water than the conventional approach.  The bad news is that it recirculates the water until you’re ready for your final rinse, then it recirculates the rinse water until you’re ready to get out.

This calls to mind a simple truth of eco-friendliness generally: it normally comes at a cost – and the question then becomes: Are we willing to pay that cost?  In this case, given the current price of water and energy in the developed world, the answer is probably no, but there may be places – and times – where this changes.