Should a damper be installed in the vent to gas water heaters?

A damper should not be installed in the vent of gas water heaters to ensure proper operation and safety. The primary function of the vent system is to allow combustion gases, including potentially hazardous carbon monoxide, to safely exit the building. A damper can obstruct this flow, leading to a buildup of gases within the venting system, which poses significant health risks and can cause dangerous situations, including the potential for backdrafting.

In addition, gas water heaters rely on a consistent flow of air to operate efficiently. The installation of a damper can interfere with the natural draft that is essential for efficient combustion and venting. Therefore, it is crucial to follow established safety and installation guidelines, which generally specify that a damper should not be included in the venting system for gas water heaters. This regulation helps ensure that the appliance operates safely and effectively, minimizing any risk associated with the venting of combustion gases.