Any other type of vent pipe will not have an air tight gasketed connection and will corode in a short period of time. This will cause a deadly carbon monoxide leak and could cause a fire.
B-Vent, even though a double wall, has an alunimum inner pipe and galvanized outer shell that will not hold up to the corrossive condensation produced by Tankless water heaters or Hi-efficiency condensing boilers.
Your installation manual for your appliance will list the correct UL listing and/or a short description of the required venting.
Cinnabar Equipment Co.
http://www.ventingstore.com
Product Knowledgebase and FAQs
Why can't I use Double wall B-Vent on my Tankless or Boiler ?
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