Gas Tank to Gas Tankless Water Heater - Vent question

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Leo Sangeet

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Hello. I'm new on this forum. I need some help on a project that I'm working.

I have a leaky gas tanked water heater system which I'm thinking about replacing. I've decided to go with Rheem Performance Platinum 9.5 GPM Condensing Direct Vent tankless gas system which comes with 2 separate vents - One for Air intake and other for Exhaust vent. My question is about exhaust vent.

Pictures of my my existing tanked heater vent is attached. Can I connect and vent the exhaust vent through this? Please advise.

For intake air I'll just connect a PVC pipe and use the attic air since I have massive attic which is about 60 x 30 feet and has can and ridge ventilation system.

Regards
Leo

tankless-normal-installation-01.jpg
 

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Terry

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You will need to use different material for the vent on this because it's a condensing tankless. The old metal one would quickly rust out.

tankless-vertical-installation-01.jpg



tankless-venting-materials.jpg
 

Fitter30

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Both intake and exhaust have to be on the same roof or wall for they have to be exposed to the same conditions like wind ( pressure). Manufacturers don't write specs and get approvals for nothing. They want to limit there liability and keep your family safe
 

Mulligan Stew

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You will need to use different material for the vent on this because it's a condensing tankless. The old metal one would quickly rust out.

tankless-vertical-installation-01.jpg



tankless-venting-materials.jpg
Both intake and exhaust have to be on the same roof or wall for they have to be exposed to the same conditions like wind ( pressure). Manufacturers don't write specs and get approvals for nothing. They want to limit there liability and keep your family safe
 

Mulligan Stew

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Does the low temp exhaust through PVC mean a standard neoprene roof vent can be used? I'm installing a condensing Noritz tankless vent (PVC sch 40 solid core) through a composite roof and would love to simply install the same neoprene flashing that I use for plumbing air vent terminations.
 

Sylvan

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If you go with plastic make sure it is protected from direct sun light
 

John Gayewski

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I think your already doing this, but don't use your attic for fresh air. It'll filth up your tankless and make your attic freezing cold in the winter. A ridge vent is only good for so many air changes per hour and it specifically sized (in linear feet) for your attic and insulation for etc.
 
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