Practice Quiz

Green Plumbing

Category - Caring for Our Planet

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What is the ratio of carbon dioxide (CO2) produced annually by the following (in order): conventional electric, conventional gas, and tankless gas water heaters?
  1. 5-5-2
  2. 2-5-8
  3. 8-2-1
  4. 20-15-2
Explanation
Answer: C - On average, conventional electric water heaters produce eight tons of CO2 annually; conventional gas and tankless gas water heaters produce an average of two and one tons, respectively. Solar water heaters produce only trace amounts of CO2 and are the best option for minimizing greenhouse gas emissions.
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