Exhaust Vent Pipe Materials All Navien water heaters are Category IV appliances; NOTE: Plastic vent can be used in all cases EXCEPT when the incoming (or recirculation return) water temperatures exceed 160°F (70°C). IF you set the water heater at a temperature higher than 160°F (70°C) AND you are running an external recirculation loop or a combination heating system, you MUST use the Navien stainless steel venting or any 3" venting system approved for use with Category IV appliances (typically Type BH Special Gas Vent approved to UL1738-S636)** Navien Recommended Vent Materials Model Type USA CANADA CR-180, CR-180A CR-210, CR-210A CR-240, CR-240A PVC Schedule 40** ABS Schedule 40** Type BH Special Gas Vent Class IIA (PVC)** CR-180, CR-180A CR-210, CR-210A CR-240, CR-240A PVC Schedule 40** ABS Schedule 40** Navien's Stainless Steel Vent Kit Navien's Stainless Steel Vent Kit or Type BH Special Gas Vent Class IIB (PVC)** Exhaust Vent Pipe Materials NOTE:The maximum lengths listed below are for the exhaust vents only. The intake vent length is equal to that of the exhaust vent. Model Series MAX Length MAX number of Elbows Equivalent Length CR/CC-180(A) 70 feet 6 90° elbow = 5 linear feet 45° elbow = 2 linear feet CR/CC-210(A) 100 feet 6 CR-CC240(A) 100 feet 6 Vent Configuration Options The following diagrams represent some typical venting configurations and are included to assist you in designing your vent system. Possible configurations are not limited to these diagrams. The option of your choice will be shown on the screen when clicked. Contact: Hooked On Hydronics Inc. 206.730.0149   We Ship to the United States and Canada. *Name: *Email: *Phone: State: Best Time To Call: Question: Note: Fields with an * are required

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Although we specialize in Hydronic Heating and Tankless Water Heaters, we are also licensed plumbers and can provide a complete heating, plumbing, natural gas piping & fire protection package if so desired.

Commercial & Residential Installation

Serving the Seattle, Bellevue and Everett

Washington Areas 

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206.730.0149

Providing Radiant Heating & Cooling Systems

Since 1991