The water heater must be properly vented to the outdoors.
Direct vent water heater venting requirements.
The venting must be vertical or upward sloping so that the hot exhaust rises up through the venting to exit your home.
See figures 4 through 8 and items below.
18 minimum from the ground and 12 from ceiling overhangs.
Warning vent termination must not be within 4 feet of any items such as gas meters gas valves or other gas regulating equipment.
Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide.
For non direct vent applications that is side wall venting only the required clearance is 7 feet.
Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run.
Atmospheric venting works on the principle of hot air rising.
All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul.
The natural gas fueled water heater shown at page top is improperly vented lacking the recommended minimum 12 of vertical rise before the elbow and vented directly into a large masonry flue where it cannot develop adequate draft.
This difference in operation means that you can install a direct vent system almost anywhere.
For this reason common venting configurations are no longer allowed in some code jurisdictions where direct venting or power venting of water heaters is now mandatory.
This heater installation may be unsafe.
18 minimum in all directions from any obstruction that may interfere.
A direct vent system pulls in air from outside and then vents the exhaust through a horizontal pipe.
In addition to venting gas and propane water heaters need an air supply for combustion.
The vent outlet must be installed a minimum of 12 in.
This venting may either be dedicated to the water heater or can be shared with other atmospheric vent appliances such as a furnace.
Above the air intake inlet.
In direct vent applications this clearance distance must be in compliance with local building codes the requirements of the fuel gas supplier for the heating appliance in use and the appliance manufacturer s instructions.
When determining the installation location for a direct vent water heater snow accumulation and drifting should be considered in areas where applicable.
