Direct-fired water heaters use a primary fuel to heat water.
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Q12: On electric water heaters with dual elements,
Q13: Indirect-fired water heaters may be tank or
Q14: Converting from a tank-type water heater to
Q15: The dip tube helps to get the
Q16: Indirect-fired water heater installations should include valves
Q18: All water heaters must be equipped with
Q19: Most electric water heaters have an upper
Q20: A new temperature-and-pressure relief valve is required
Q21: If you smell the gas odorizer (an
Q22: Most standards now require that a(n) _
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