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2. Hand pump - Wikipedia

   en.wikipedia.org/wiki/Hand_pump

   A chain pump is a type of water pump that uses a chain to move water from one place to another. It works on the principle of a continuous loop of chain moving through a series of sprockets, with attached buckets that lift water as the chain passes over the top sprocket and discharge it as the chain reaches the bottom.

3. 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]

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 ...

   www.aol.com/energy-prices-high-tankless-water...

   Tankless water heaters run on gas or electric, so we’ve consulted our guide listing the best tankless water heaters to give you a cost-effective option for each.. The Rheem RTEX-18 is one of the ...

6. 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.

7. Comparison of pumps - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_pumps

   Different types of pumps are suitable for different applications, for example: a pump's maximum lift height also determines the applications it can be used for. Low-lift pumps are only suitable for the pumping of surface water (e.g., irrigation, drainage of lands, ...), while high-lift pumps allow deep water pumping (e.g., potable water pumping ...