Can furnace and hot water heater share vent?

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. The photo below shows typical combined furnace + water heater venting.Click to see full answer. Similarly, it is asked, can furnace and water heater share PVC vent?The fan, however, does not exert positive pressure into the flue pipe. Category IV Appliances are mainly high-efficiency water heaters and furnaces that use plastic vent pipes. These appliances also operate with positive vent pressure and cannot share a common vent with a gravity-vented water heater.Also, can you vent a hot water heater out the side of the house? Water heaters with power venting come with an electric blower fan (often very quiet) installed on top of the water heater and can have either vertical or horizontal vent ducts. Since the vent does not rely on the buoyancy of hot air, it can be run horizontally to the outside of the house. Subsequently, one may also ask, how do I vent my furnace and water heater? Standard practice is to have the vents from furnaces and hot water heaters attach from the appliance to a solid single wall pipe, and then connect to a solid double wall pipe. The double wall pipe then vents through to the exterior.Does the furnace affect the water heater?Indirect water heaters can be powered by gas, electric, oil, or propane, and operate like direct water heaters. However, instead of having a heating mechanism inside the tank, it uses the heat from your furnace or boiler. Your furnace or boiler will have a pipe attached to the water heater.