Tankless Water Heater Venting Requirements

See the use and care manual for important information regarding the venting installation and materials for your tankless water heater.

Tankless water heater venting requirements. The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting. The attached installation instructions from the manufacturer of these water heaters require a minimum vertical rise in the water heater exhaust flue as well as a proper ul listed chimney cap or termination for safe venting of combustion products. Direct vent and power vent. Tankless water heaters don t always need two ventilation pipes even for direct vent units.

Tankless water heaters should not be installed near dryer vents or intake air vents. Ansi z223 1 nfpa 54 in the united states and or section 7 of the can csa b149 1 natural gas and propane installation code in canada as well as applicable local building codes. All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul. Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide.

Any new tankless is going to require a special type of venting whether it be pvc or a proprietary brand. Vent adapter is needed to connect the water heater which is tankless to the exhaust hose. Facts about tankless water heater venting. Tankless units withstand below freezing temperatures.

Indoor tankless water heaters draw in outside air. Tankless water heaters are vented in two ways. Here are a few things your installer should consider for effective tankless water heater venting. Vent to the outside.

American tankless water heaters venting. No they don t need to be vented. Tankless water heater vent clearances if the unit is vented to the outside then it needs 12 inches of clearance from a door or window. You do have way more options with electric than with gas or propane but the issue generally is the gpm.

There are grave liabilities and risks involved in violating basic mechanical and safety standards. Special stainless steel pipe. Outside tankless water heaters free up indoor space. If the window does not open the tankless water heater clearance from a window requires a 12 inch setback.

The water heater must be vented in accordance with the section venting of equipment of the latest edition of the national fuel gas code. If you have issues with where to place a tankless water heater due to venting concerns then your best bet may be to get an electric tankless water heater. Tankless water heater venting features. Gas tankless water heaters don t have to use indoor air for combustion.

The biggest issue i see with tankless water heaters is contractors using the existing 3 4 gas line.