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A great way to save money is to install a heat exchanger on the drain of your shower. By warming your cold water feeding the hot water tank or instantaneous unit you can reduce the amount of energy to replenish the heater.

My website: http://www.plumboogle.com

How to make a heat exchanger, first video :    • How To Make A Heat Exchanger - VIDEO HD  

How to prepare and solder copper:    • Plumbing How To,  Soldering Copper - ...  

See how a plate exchanger works:
   • Plate Heat Exchanger - Introduction