Which statement about carbon monoxide testing is true?

• A. It is required for all electric water heaters
• B. It is not produced by electric water heaters
• C. It should be performed after every repair
• D. It is part of regular maintenance for water heaters regardless of fuel type

Answer: (B)

Carbon monoxide comes from incomplete combustion of fuels like natural gas, propane, or oil. Electric water heaters don’t burn fuel, so they don’t produce carbon monoxide. That’s why the statement that carbon monoxide testing is not produced by electric water heaters is true.

The other options don’t fit because testing for CO isn’t needed for electric units (no CO to test), CO testing isn’t something that must be done after every repair, and CO testing isn’t a universal part of regular maintenance for water heaters that run on electricity. For fuel-burning appliances, CO testing is relevant, but electric models aren’t a source of CO.