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Old 06-22-2017, 10:08 AM   #1
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Gas Tankless Venting - Will Existing Tanked Venting Work?


I have a gas tanked water heater in an upstairs closet venting upward out through the roof. I'm considering replacing it with a Gas Tankless system.
Years back I was told that venting for my existing water heater would need to be replaced with heavier gauge pipes if I were to go tankless. Was this a true statement? Is it still the case? Can I replace my gas tanked heater with a tankless without changing the existing vents. Any recommendations on a tankless system? Where could I find installation steps for this?

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Old 06-22-2017, 10:10 AM   #2
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Re: Gas Tankless Venting - Will Existing Tanked Venting Work?


Have you done the math to ensure a tankless will work? They are generally much better on paper than in real life.
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Old 06-22-2017, 12:05 PM   #3
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Re: Gas Tankless Venting - Will Existing Tanked Venting Work?


Vent sizing is based on BTU's. A tankless is going to be way more BTU's than one with a tank.
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Old 06-22-2017, 05:48 PM   #4
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Re: Gas Tankless Venting - Will Existing Tanked Venting Work?


Quote:
Originally Posted by dreiding View Post
I have a gas tanked water heater in an upstairs closet venting upward out through the roof. I'm considering replacing it with a Gas Tankless system.
Years back I was told that venting for my existing water heater would need to be replaced with heavier gauge pipes if I were to go tankless. Was this a true statement? Is it still the case? Can I replace my gas tanked heater with a tankless without changing the existing vents. Any recommendations on a tankless system? Where could I find installation steps for this?

TIA,
Patrick
There are many different models of tankless. But I can tell you for sure that venting will need to be redone.
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Old 06-22-2017, 06:19 PM   #5
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Re: Gas Tankless Venting - Will Existing Tanked Venting Work?


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There are many different models of tankless. But I can tell you for sure that venting will need to be redone.
+1
Assuming your current heater is natural draft- you will not be able to use that vent for a new mech. draft tankless. A new vent system will be needed based on the manufacturers installation manual. Perhaps even a different location as well.
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Old 06-22-2017, 07:49 PM   #6
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Re: Gas Tankless Venting - Will Existing Tanked Venting Work?


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+1
Assuming your current heater is natural draft- you will not be able to use that vent for a new mech. draft tankless. A new vent system will be needed based on the manufacturers installation manual. Perhaps even a different location as well.
Which isn't totally bad. You can hook up most of your new tankless while still using your old tank until the tankless is ready to rock.
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