Flue Exhaust Pipe Assembly for Instantaneous Gas Heaters
Stainless steel concentric flue pipe set venting combustion exhaust while drawing intake air in tankless water heaters. HTS 8419.90.10.00 applies as essential safety part for non-electric instantaneous heaters. Design prevents carbon monoxide buildup during on-demand operation.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If generic stainless steel exhaust tubing
Non-application-specific pipes classify under fabricated steel tubes, not machinery parts.
If parts of central heating boilers
Similar flues for boilers fall under boiler parts if not water heater dedicated.
If for domestic electric water heaters
Electric storage heaters use electrical venting or none, shifting to general parts.
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Import Tips & Compliance
• Include UL or equivalent certification for venting safety to support tariff heading
• Document concentric design specs distinguishing from standard chimney pipes
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