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2. Water recycling shower - Wikipedia

   en.wikipedia.org/wiki/Water_recycling_shower

   External hot water is used to maintain temperature, with incoming hot water replacing the used water within the loop. In addition to replacement, water within the loop is filtered and purified with UV light. [11] For users unable or unwilling to use the recycling mode, the e-Shower offers a classic shower where all the water is drained. [12]

3. Unplug These 8 Appliances That Will Hike Up Your Electricity ...

   www.aol.com/unplug-8-appliances-hike-electricity...

   Hot Water Recirculation Pump. As a serial climate tech entrepreneur, Andrew Meyer, CEO of Arbor, has a mission to help everyone save money and live more sustainably. “If you want to save money ...

4. Unplug These Appliances That Hike Up Your Electricity Bill - AOL

   www.aol.com/unplug-appliances-hike-electricity...

   Hot Water Recirculation Pump Average Wattage: 28-92 watts Cost per Year: $28-$93 Plug your hot water recirculation pump into a timer and program it to switch the pump off at times when no one is ...

5. Circulator pump - Wikipedia

   en.wikipedia.org/wiki/Circulator_pump

   The traditional hot water recirculation system uses the existing cold water line as return line from the point of use located farthest from the hot water tank back to the hot water tank. The first of two system types has a pump mounted at the hot water heater while a "normally open" thermostatic control valve gets installed at the farthest ...

6. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   Installation of a double-walled copper-on-copper heat exchanger in a vertical section of the master drain line in a Canadian home (2007) Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery, [citation needed] or sometimes shower water heat recovery [citation needed]) is the use of a heat exchanger to recover energy and reuse heat ...

7. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Recirculation systems: Since a tankless water heater is inactive when hot water is not being used, they are incompatible with passive (convection-based) hot water recirculation systems. They may be incompatible with active hot water recirculation systems and certainly use more energy to constantly heat water within the piping, defeating one of ...