Tankless Water Heater Venting Requirements

Gas tankless water heaters don t have to use indoor air for combustion.

Tankless water heater venting requirements.

All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul. The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting. American tankless water heaters venting. Facts about tankless water heater venting.

Special stainless steel pipe. 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. 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.

There are grave liabilities and risks involved in violating basic mechanical and safety standards. No they don t need to be vented. Tankless water heaters don t always need two ventilation pipes even for direct vent units. If the window does not open the tankless water heater clearance from a window requires a 12 inch setback.

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. 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. You do have way more options with electric than with gas or propane but the issue generally is the gpm. Here are a few things your installer should consider for effective tankless water heater venting.

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. The water heater must be vented in accordance with the section venting of equipment of the latest edition of the national fuel gas code. Vent adapter is needed to connect the water heater which is tankless to the exhaust hose. The first permit is for the water heater itself.

See the use and care manual for important information regarding the venting installation and materials for your tankless water heater. You re only looking at 20 to 100 out of pocket as opposed to several hundred dollars to call in a plumber. Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide. Tankless water heaters should not be installed near dryer vents or intake air vents.