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2. Hand pump - Wikipedia

   en.wikipedia.org/wiki/Hand_pump

   Direct action hand pumps have a pumping rod that is moved up and down, directly by the user, discharging water. Direct action handpumps are easy to install and maintain but are limited to the maximum column of water a person can physically lift of up to 15 m.

3. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Back pressure can force an undesirable contaminant to enter potable water piping. Sources of back pressure may be boilers, heat exchanging equipment, power washing equipment, fire sprinklers, or pumps in the water distribution system. In some cases there may be an almost continuous risk of overcoming the static water pressure in the piping.

4. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Direct electric resistance tank water heaters are not included in the Energy Star program; however, the Energy Star program does include electric heat pump units with energy factors of 200% or higher. Tankless gas water heaters (as of 2015) must have an energy factor of 90% or higher for Energy Star qualification.

5. Energy Prices Are High—And These Tankless Water Heaters Can ...

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6. Circulator pump - Wikipedia

   en.wikipedia.org/wiki/Circulator_pump

   By installing a thermostatically controlled pump just after the farthest fixture on the loop, cyclic pumping maintains ready hot water up to the last fixture on the loop instead of wasting energy heating the piping from the last fixture to the water heater. Installing a circulation pump at the farthest fixture on a hot water circulation loop is ...

7. India Mark II - Wikipedia

   en.wikipedia.org/wiki/India_Mark_II

   A broken India Mark II pump in rural Uganda A busy Mark II pump in Uganda. Children often bear the responsibility for collecting water. Durability needs to be incorporated into pump design to the handle the heavy use (and abuse). The India Mark II is a human-powered pump designed to lift water from a depth of 50–80 m. [1]