Onsen 3" Horizontal Vent Kit
Onsen 3" Horizontal Vent Kit
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Onsen 3" Horizontal Vent Kit
Premium Z-Vent stainless steel exterior wall venting with built-in freeze protection, engineered to safely exhaust combustion flue gases in cold northern climates.
Built-In Freeze Guard
Integrated backflow damper keeps freezing outdoor air from entering the heater and bursting internal pipes.
Acid-Resistant Stainless
Crafted from premium AL-294C super-ferritic stainless steel to withstand corrosive flue condensation for decades.
Safe Wall Pass-Through
Includes an insulated wall thimble, 90° elbow, extension pipes, and hooded termination cap for a complete setup.
Certified & Guaranteed
UL and cUL listed for Category II, III, and IV gas appliance venting, backed by a 15-year limited manufacturer warranty.
- Why Freeze Protection Matters: In cold Canadian winters, sub-zero winds can blow back down an open exhaust flue and freeze the water inside your heater's copper heat exchanger. The built-in backflow preventer flapper closes automatically when the unit isn't running to stop cold drafts.
- Acidic Exhaust Resistance: Gas combustion creates acidic condensate that eats through standard stainless steel. Premium AL-294C alloy is engineered specifically to withstand these acids without pitting or pinholing.
- Slope & Snow Clearance: Install horizontal vent pipes with a slight downward pitch away from the water heater to drain moisture, and mount the outside hood well above your area's maximum expected winter snowline.
- Tips & Tricks: Check out our Tankless Water Heater Selection Guide for sizing, layout, and venting guidelines.
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