Tankless Water Heater Venting Requirements

Here are a few things your installer should consider for effective tankless water heater venting.

Tankless water heater venting requirements.

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. There are grave liabilities and risks involved in violating basic mechanical and safety standards. If the window does not open the tankless water heater clearance from a window requires a 12 inch setback. Tankless water heater venting features.

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. Outside tankless water heaters free up indoor space. Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide. 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.

Indoor tankless water heaters draw in outside air. Special stainless steel pipe. Gas tankless water heaters don t have to use indoor air for combustion. Facts about tankless water heater venting.

Tankless water heaters can be vented in two ways. Tankless water heaters don t always need two ventilation pipes even for direct vent units. American tankless water heaters 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.

Tankless units withstand below freezing temperatures. The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting. The water heater must be vented in accordance with the section venting of equipment of the latest edition of the national fuel gas code. Direct vent and power vent.

Tankless water heaters are vented in two ways. Vent adapter is needed to connect the water heater which is tankless to the exhaust hose. The biggest issue i see with tankless water heaters is contractors using the existing 3 4 gas line. All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul.

Any new tankless is going to require a special type of venting whether it be pvc or a proprietary brand. The high efficiency 90 or higher furnace will also require pvc venting. See the use and care manual for important information regarding the venting installation and materials for your tankless water heater. No they don t need to be vented.

Vent to the outside.