Fixtures & Water HeatersQuestion 188 of 360
An atmospherically vented gas water heater relies on which principle to move flue gases out of the building?
a.A powered blower on the tank
b.Positive pressure from the gas supply
c.The natural buoyancy of hot flue gases rising through the vent (draft)
d.The T&P relief valve
Explanation
A natural-draft (atmospheric) water heater vents by the buoyancy of hot combustion gases rising through a properly sized and sloped vent connector and flue. Adequate draft depends on vent height, slope, and combustion air. Blockage or poor connector slope can cause dangerous spillage of flue gases.
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