Tankless Water Heater Venting Requirements

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.

Tankless water heater venting requirements.

Outside tankless water heaters free up indoor space. There are grave liabilities and risks involved in violating basic mechanical and safety standards. 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. Tankless water heaters can be vented in two ways.

Tankless water heaters should not be installed near dryer vents or intake air vents. Tankless units withstand below freezing temperatures. American tankless water heaters venting. Any new tankless is going to require a special type of venting whether it be pvc or a proprietary brand.

Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide. 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 heaters don t always need two ventilation pipes even for direct vent units. Tankless water heaters are vented in two ways.

Direct vent and power vent. See the use and care manual for important information regarding the venting installation and materials for your tankless water heater. The water heater must be vented in accordance with the section venting of equipment of the latest edition of the national fuel gas code. All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul.

No they don t need to be vented. The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting. 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. Vent to the outside.

Vent adapter is needed to connect the water heater which is tankless to the exhaust hose. You do have way more options with electric than with gas or propane but the issue generally is the gpm. Special stainless steel pipe. The high efficiency 90 or higher furnace will also require pvc venting.

The biggest issue i see with tankless water heaters is contractors using the existing 3 4 gas line. All indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using factory approved venting material no other venting material is permitted. Here are a few things your installer should consider for effective tankless water heater venting. If the window does not open the tankless water heater clearance from a window requires a 12 inch setback.

Facts about tankless water heater venting.