Most Tankless manufacturers only require our Z-Vent AL29-4C single wall stainless steel.However, it's always best to check with your local building inspector because your local code may require doube wall.
The clearance to combustibles is the same with either using single or double wall Z-Vent brand of pipe.
Please call Cinnabar Equipment for pricing on Z-Vent Double Wall.
Cinnabar Equipment Co.
http://www.ventingstore.com
Product Knowledgebase and FAQs
Do I need Z-Vent Double-Wall for my Tankless Venting ?
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