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2. 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 ...

3. Thermostatic mixing valve - Wikipedia

   en.wikipedia.org/wiki/Thermostatic_mixing_valve

   There are three main categories for water temperature controlling devices: Heat Source, Group Control, and Point-of-Use. Heat Source. These are used with central heating systems that use water as a medium. Tempering valves for use on hot water heat distribution systems; High flow rates suitable for use in under floor (radiant) heating applications

4. Water recycling shower - Wikipedia

   en.wikipedia.org/wiki/Water_recycling_shower

   The first recycling shower, operated by a hand pump, was patented in England in 1767 by the stove maker William Feetham. [1] This recycling shower used the pump to push the water into a basin above the user's head. To receive the water, the user pulled a chain to release the water from the basin.

5. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   If a storage water heater is replaced with a tankless one, the installer may have to increase the size of the electrical wiring or gas pipeline to handle the load, and replace the existing vent pipe—possibly adding expense to the retrofit. Many tankless units have fully modulating gas valves that range from as low as 10,000 to over 1,000,000 ...

6. Pressure-balanced valve - Wikipedia

   en.wikipedia.org/wiki/Pressure-balanced_valve

   The pressure-balanced shower valve compensates for changes in water pressure. It has a diaphragm or piston inside that reacts to relative changes in either hot or cold water pressure to maintain balanced pressure. As water pressure drops on one supply line, the valve reduces the pressure in the other supply line to match.

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