Gas Water Heater Vent Pipe Code

If the draft hood that came with your water heater has a top opening diameter designed for 3 vent pipe and you have 4 vent pipe installed use an adapter increaser.

Gas water heater vent pipe code.

The different types of venting. When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater. 504 7 1 pan size and drain. The process of burning of the gas is called combustion and it creates heat exhaust gases including highly poisonous carbon monoxide and moisture the water heater s ventilation system removes these byproducts from the home making it a critical safety feature.

All water heaters that burn natural gas or liquid propane lp gas require a venting system. These vents must be made of suitable materials and be kept clear of. The pan shall be not less than 1 1 2 inches 38 mm in depth and shall be of sufficient size and shape to receive all dripping or condensate from the tank or water heater. Violating these codes may result in fines voiding your warranty or putting your family at risk.

Code expert glenn mathewson describes 10 common water heater code issues including confusion about drip pans and drains unsupported expansion tanks and plastic vents lack of combustion air and more. Proper venting gas and propane heaters emit carbon monoxide which must be vented outside. The national fuel gas code ansi z223 1 nfpa 54 link to 2012 edition. Gas water heater draft hoods come in different sizes and if you are replacing water heater make sure that the draft hood and the water heater vent pipe match each other.

The vent system for a gas fired water heater must be installed according to local and state codes or in the absence of local or state codes the current edition of. 11 pipe should be of approved materials. Copper glavanized steel cpvc and pex or pe rt are all approved. Understanding water heater installation code requirements can be a real pain.

The photo below shows typical combined furnace water heater venting. Use the manufacturer provided draft hood. Installing a tank water heater might seem easy but homeowners who refinish their basements often create a number of code violations with respect to the water heater. With a replacement high efficiency furnace the existing vent pipe does not work for water heater only because the vent is too large.

The pan shall be drained by an indirect waste pipe having a diameter of not less than 3 4 inch 19 mm. For safety water heaters must be vented using a listed and approved venting system that provides adequate size height and draft. For some reason the installer of the water heater shown below decided that the tpr drain piping needed a vent pipe.