Green Plumbing

Category - Caring for Our Planet

Which of the following are not a renewable energy-driven plumbing appliance currently undergoing development and/or introduction?
  1. Solar-powered toilet that converts waste into biochar
  2. Geothermal water heater using a fluid loop in the ground
  3. Wind-powered clothes washer with second cycle for drying
  4. Biomass-burning water heater using waste products
Explanation
Answer: C -No wind-powered clothes washer exists. All of the other responses are plumbing products either currently being marketed or under development for use with renewable energy sources.
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