Venting Gas Furnace And Hot Water Heater

Want to add a 40 000 btu gas hot water heater to same 4 chimney duct.

Venting gas furnace and hot water heater. In many cases the exhaust from the larger appliance heats up the common vent improving the flow of the water heater vent. 4 flexible chimney liner runs from basement up 1st floor and out to roof. The exhaust gas temperature of modern gas furnaces and water heaters is much lower than past appliances because much more heat is harvested so you waste less money up your chimney. Atmospheric venting refers to a system in which exhaust from the water heater naturally rises out of the appliance s combustion chamber then travels up through a standard chimney style flue.

The conditions explained in this post also apply to the wood burning appliances. The function of these fins on the gas water heater flue vent connector is to try to increase the transfer of heat from the water heater exhaust into the surrounding area maybe to make it warmer in a fantasy that we re cutting heating cost by exracting heat perhaps in hope of preventing frozen pipes nearby. Proper furnace water heater venting is an extremely important issue which depends on the performance of the house chimney chimney flue or other exhaust assemblies. The main concern has been whether a gravity vented water heater flue can be connected to the fan assisted flue of a plus 80 afue rated forced air furnace.

When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater. Over the years we have received many questions regarding combined venting of furnaces and water heaters. The photo below shows typical combined furnace water heater venting. Rheem s prestige high efficiency natural gas combi boiler rheem s prestige high efficiency natural gas combi boiler provides an efficient continuous supply of domestic hot water used for faucets showers washing machines etc and provides hydronic space heating for residential applications such radiant floors baseboards hydronic air handlers etc.

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. This is called a common vent configuration. Traditional masonry chimneys were designed and sized to vent very hot flue gases from old coal wood burning or low efficiency gas furnaces. Consequences of improperly assembled vent pipes problematic chimney flue deteriorating chimney walls can be sometimes fatal fire and carbon.

By michael casey and barry stone.