Onsen 3" Insulated Air Intake Kit
Onsen 3" Insulated Air Intake Kit
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Onsen 3" Insulated Fresh Air Intake Kit
Supplies fresh outside air directly to your Onsen indoor water heater while thick insulation prevents cold-pipe sweating and water drips on your walls.
Fresh Outside Air
Feeds clean air directly to the burner so the heater won't deplete indoor oxygen or create room drafts.
Stops Pipe Sweating
Thick fiberglass wrap and foil vapor jacket stop cold winter air from dripping condensation indoors.
Flexible 4–10 Ft Fit
Durable aluminum duct bends easily around wall framing and expands from 4 to 10 feet for a clean setup.
Certified Air Duct
ULC-S110 and UL-181 Class 1 certified for airtight, leakproof, and vibration-dampened installation.
- Why Use Fresh Air Intake: Pulling outside air directly to the sealed heater keeps your room comfortable and prevents the unit from using up indoor room air.
- Seal Snug to Stop Moisture: Tighten the clamps firmly over the foil insulation at both ends so warm indoor air can't reach the cold inner pipe and create drips.
- Outdoor Clearance: Keep the outside intake hood positioned clear of winter snowdrifts and away from the hot exhaust vent according to your local guidelines.
- Tips & Tricks: Check out our Tankless Water Heater Selection Guide for sizing, layout, and venting guidelines.
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