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2. Hot tub - Wikipedia

   en.wikipedia.org/wiki/Hot_tub

   The earliest hot tubs were calderas in which hot stones were placed to heat the water. [citation needed] Therma in Ikaria has been a very popular place particularly for hydrotherapy ever since the 4th century B.C. [2] The remains of wrecked marble bathtubs along with a prehistoric aqueduct that have been unearthed from this area bear ample testimony of the place's popularity in the ancient times.

3. Hand pump - Wikipedia

   en.wikipedia.org/wiki/Hand_pump

   A hand pump opens access to deeper groundwater that is often not polluted and also improves the safety of a well by protecting the water source from contaminated buckets. Pumps such as the Afridev pump are designed to be cheap to build and install, and easy to maintain with simple parts.

4. Circulator pump - Wikipedia

   en.wikipedia.org/wiki/Circulator_pump

   A household circulator pump clogged by contaminants. Circulating pumps are often used to circulate domestic hot water so that a faucet will provide hot water instantly upon demand, or (more conserving of energy) a short time after a user's request for hot water.