Green Plumbing

Category - Caring for Our Planet

In what year was the first residential water heater patented?
  1. 1793
  2. 1831
  3. 1868
  4. 1902
Explanation
Answer: C - The first residential water heater was patented in 1868. It used a type of gas as its fuel source. However, the lack of a flue in the design rendered it unsafe for household use.
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