Practice Quiz

Green Plumbing

Category - Caring for Our Planet

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Which option below shows the chronological order of the evolution of recirculating water heating systems?
  1. Fully-heated loop - Fully-heated loop w/aquastat - Half-heated loop
  2. Half-heated loop - Half-heated loop, pump at last fixture - Fully-heated loop w/aquastat
  3. Half-heated loop - Fully-heated loop - Fully-heated loop w/aquastat
  4. Half-heated loop, pump at last fixture - Half-heated loop -Fully-heated loop
Explanation
Answer: A - The evolution of recirculating water heating systems began with a fully-heated loop, later added an aquastat, and then evolved to a half-heated loop design. After that was a half-heated loop with the pump at the last fixture. This progression of design changes was driven by successive efforts to reduce hot water waste and risk.
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