Editing Talk:what if?

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Shall we forgive him this oversight and carry out some analysis to determine the harness-able energy content of hot water from the bathtub faucet in an average American apartment building?
 
Shall we forgive him this oversight and carry out some analysis to determine the harness-able energy content of hot water from the bathtub faucet in an average American apartment building?
  
:TODO: discuss Sterling engines or other strategies here.  (That means you! :)
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:TODO: discuss Sterling engines or other strategies here.  Well, what are you waiting for? :)
  
:I believe that even when you "run out of hot water", the incoming water will still have energy added since the gas or electric water heater will be running non-stop, turning cold water into slightly-less-cold water.  Since slightly-less-cold water is still colder than the ambient temperature in the apartment, I'm not sure how to harness the energy added by the water heater... But neither am I sure that "you can't".  TODO: Can someone confirm that you can't?
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:I believe that even when you "run out of hot water", the incoming water will still have energy added since the gas or electric water heater will be running non-stop, turning cold water into slightly-less-cold water.  Since the water in the mains presumably colder than the ambient temperature in the apartment, I'm not sure how to harness the energy of slightly-less-cold water...
  
 
Shall we then turn the dial up a notch, [http://what-if.xkcd.com/35/ What-if 35 style], and imagine how the scenario changes if the apartment building has a water heater that is perfectly capable of keeping the hot faucet piping hot, even if you run it 24/7?
 
Shall we then turn the dial up a notch, [http://what-if.xkcd.com/35/ What-if 35 style], and imagine how the scenario changes if the apartment building has a water heater that is perfectly capable of keeping the hot faucet piping hot, even if you run it 24/7?

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