Furnace And Water Heater Venting Diagram

The most common problem associated with water heater venting is a condition called backdrafting in which exhaust gases from the water heater fail to exit the home via the vent and instead end up in the house backdrafting can have many causes but it is most commonly due to poor vent design or installation and or an imbalance of air volume in the home.

Furnace and water heater venting diagram.

The result is a back draft of combustion products out of the water heater s draft hood and into the building. When the vent is withdrawing air from the house it expels the gas outside through the vent. Also known as the type b this vent is operating on the natural air convection. Bradford white water heaters may at any time and at its sole discretion change or replace the information available on the bradford white water heaters youtube channel and in the videos contained therein.

With a replacement high efficiency furnace the existing vent pipe does not work for water heater only because the vent is too large. Any action you take on the information on the bradford white water heaters youtube or vimeo channels are strictly at your own risk. The old vent pipe is too large because it served both the furnace and water heater. Gas water heater vent codes standards.

Once a high efficiency condensing furnace removes this excess heat that conventional furnaces vent to the outside of a home the leftover mixture is acidic water. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. The conditions explained in this post also apply to the wood burning appliances. In comparing the venting of exhaust gases from a high efficiency furnace boiler or water heater with the venting of exhaust gases from a conventional heating system it will be immediately obvious that the high efficiency equipment exhaust is produced at a low enough temperature that it is vented through comparably small diameter plastic piping.

In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types. This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home. The photo below shows typical combined furnace water heater venting. High e furnaces have separate venting.

Consequences of improperly assembled vent pipes problematic chimney flue deteriorating chimney walls can be sometimes fatal fire and carbon. The lower btuh of a gas water heater compared with a heating furnace or boiler will very often be unable to heat the chimney interior sufficiently to develop a draft. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.