A water heater needs air to work properly and efficiently. So, venting a water heater properly is very important. In order to vent a water heater correctly it is crucial to understand what types of venting are available for each type of water heater.
Take a look at an overview of standard gas water heaters and the venting they use.
- Standard atmospheric gas water heater: These are the most common water heaters found in many homes and mobile homes with outside access. Atmospheric venting works with the difference of temperature and pressure from inside and outside the home to move the exhaust gas out through the vertical flue pipe. A standard vent normally works great for this type of water heater, but can be susceptible to back drafting. Be aware of the signs of a gas leak and if you suspect any type of improper venting contact the gas company or call a plumber right away because this can cause damage or illness.
- Direct vent water heater: Air for combustion is drawn from the vent, which is either run from outside the wall or through the roof. Off gases are vented outside as well. Taking fresh air from outside can reduce the risk of accidental fires caused by flammable vapors around the water heater. Some units can only vent horizontally or up to so many inches before a power vent is required. Direct vent models will eliminate any problems caused by insufficient indoor ventilation. Some direct vent systems have a dual channel one pipe system meaning only one pipe needs to go through the wall or roof where fresh air is taken and off gases are vented. Other direct vent types take air from a pipe that is ran under the house and to the exterior and they vent the off gases through the roof.
- Power vent water heater: Power vent models come with a blower (often very quiet) installed on top of the water heater and can be used in vertical and horizontal application. Since the vent does not rely on the buoyancy of hot air it can be run horizontally to the outside of the house. The blower cools the air so the vent can be run in PVC pipe and is easy to assemble. This blower will require an outlet within 6 feet so if you are thinking about one of these models take that into consideration.
When venting a water heater it is also important to consider the building code and permit requirements for your area. For more information on properly venting your water heater – or for a professional’s help – give Outstanding Plumbing a call today!