Venting Furnace And Water Heater Together

A direct vent system pulls in.

Venting furnace and water heater together.

In those cases the cold masonry cools the exhaust gases causing loss of draft as well as moisture condensation. Two appliances connected into single vent. If you re replacing natural draft furnace no motor assistance for exhaust gases removal with an induced forced draft motor equipped appliance and your natural draft water heater remains connected to the same chimney flue pipe make sure that water heater vent pipe connection is y and not t type. Water heater ducts may lead directly outdoors or they may tie into a larger vent duct that also serves a gas or propane furnace or boiler in the home.

They are connected at the wye. Take a look at the two pics then. Lowering the btu rating of the furnace by even half would not require a change in the size of venting. The duct may be metal or plastic depending on the type of vent system.

Another potential problem with newer category i vents involves furnace and water heater flues that are connected to masonry chimneys. Let s say you have a job where you combine a furnace or boiler 8 flue with a water heater 6 flue. All water heater venting systems use a vent duct or pipe also called a chimney or flue to bring exhaust gases from the water heater to the outdoors. The solution is to use the masonry chimney as a chase for a b vent.

The furnace is induced draft the water heater natural. The difference is that a power vent water heater pulls in combustion air from the space around the appliance then uses a fan to propel the exhaust through the vent. To determine the main flue size refer to figure 3 and locate the square inch area of each individual flue size. I know that irc g2427 3 3 4 allows these two appliances to join into a common vent connector.

The water heater vent is located below the furnace vent at the wye. Many homes are built with the water heater and furnace sharing the same combustion gases exhaust vent. When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater.