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  #1  
Old 1/26/11, 7:42 AM
Joshua L. Frederick Joshua L. Frederick is online now
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Default Exterior tankless water heater vent clearance

Bosch tankless water heater vent approx. 5' below kitchen window. What's the proper clearance? Safety Concern? (Black vent hood to the right of AC unit).

Thanks in advance.
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  #2  
Old 1/26/11, 7:58 AM
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Wayne B. Wilson, TN 439 Wayne B. Wilson, TN 439 is online now
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Default Re: Exterior tankless water heater vent clearance

I would not think that would be allowed just because of possible blockage if i am seeing things right.



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Old 1/26/11, 9:10 AM
KEVIN WOOD, CMI KEVIN WOOD, CMI is offline
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Default Re: Exterior tankless water heater vent clearance

According to the standards of installation. This is not safe and needs to be away from window or the window must be secured or fixed.
I do agree that it can be blocked or even have a barbeque placed in the front. Clearance to windows and doors is generaly 5-6 feet but can be as low as 3 feet according to your authority having the final say.
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Old 1/26/11, 3:04 PM
Brian A. MacNeish Brian A. MacNeish is offline
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Default Re: Exterior tankless water heater vent clearance

Quote:
Originally Posted by jfrederick View Post
Bosch tankless water heater vent approx. 5' below kitchen window. What's the proper clearance? Safety Concern? (Black vent hood to the right of AC unit).

Thanks in advance.
May be alright for the window but snow may cover the vent in that location.
See: http://www.boschhotwater.com/Portals...ual11_2009.pdf
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Old 1/26/11, 3:45 PM
KEVIN WOOD, CMI KEVIN WOOD, CMI is offline
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Default Re: Exterior tankless water heater vent clearance

Brian it depends on "Propane or natural gas".
Since we don't know what model it is I exercised caution and picked Propane. Plus I don't care what the installation tells me. I know from experience three to five feet is safe and acceptable by most jurisdictions. This is what I go by.
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Old 1/26/11, 8:26 PM
Brian A. MacNeish Brian A. MacNeish is offline
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Default Re: Exterior tankless water heater vent clearance

Quote:
Originally Posted by kwood View Post
Brian it depends on "Propane or natural gas".
Since we don't know what model it is I exercised caution and picked Propane. Plus I don't care what the installation tells me. I know from experience three to five feet is safe and acceptable by most jurisdictions. This is what I go by.
I didn't see any distinction made in that sample installation brochure. Why did you indicate there is a difference?
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Old 1/26/11, 10:32 PM
KEVIN WOOD, CMI KEVIN WOOD, CMI is offline
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Default Re: Exterior tankless water heater vent clearance

Well documented inherent Dangers of Propane over natural gas.
Natural gas is plumbed in by gas techs.
Propane can and is done sometimes by home owners.Sometimes the bottle is put in the basement.This is why we take this into consideration when making recommendations.
The five to six foot rule away from doors and open windows is on the eye of caution only,not a code or rule.Most will allow you to fallow the codes but this does not mean it is a good idea.
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Old 1/26/11, 10:51 PM
Robert Smith Robert Smith is offline
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Default Re: Exterior tankless water heater vent clearance

Anyone think when the AC is running it my hamper proper venting of the WH?




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Old 1/27/11, 3:48 AM
Brian A. MacNeish Brian A. MacNeish is offline
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Default Re: Exterior tankless water heater vent clearance

Quote:
Originally Posted by kwood View Post
Well documented inherent Dangers of Propane over natural gas.
Natural gas is plumbed in by gas techs.
Propane can and is done sometimes by home owners.Sometimes the bottle is put in the basement.This is why we take this into consideration when making recommendations.
The five to six foot rule away from doors and open windows is on the eye of caution only,not a code or rule.Most will allow you to fallow the codes but this does not mean it is a good idea.
Very odd! Not allowed here!

What kind of documentation?

Last edited by Brian A. MacNeish; 1/27/11 at 3:52 AM..
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Old 1/27/11, 7:07 AM
KEVIN WOOD, CMI KEVIN WOOD, CMI is offline
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Default Re: Exterior tankless water heater vent clearance

Propane is heavy and will sit in pockets in your basement. You cant smell it unless you sniff the floor. It travels quickly with air movement. The installation shows its being installed in the basement.
It can be installed by the homeowner.
The tanks can be played with.
The tank can be installed inside by amature.
CO detectors may be placed too high to be effective.
CO detectors may not be sensitive enough.
If you take any safety training on Propane, natural gas and oil
you can bet your intructors will explain more to you.
All this because you say it can be installed according to code.
Remember as inspectors we don't even mention codes.
How many installers do you know fallow logic and not manufacturer installation?
Just because it says you can have 18 inches clearance from combustibles
will you try to go as close as 18 inches?
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Old 1/27/11, 7:54 AM
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Michael Larson Michael Larson is offline
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Default Re: Exterior tankless water heater vent clearance

Yes propane is heavier that air but that has nothing to do with the question at hand.

And Propane "bottles" are not allowed inside homes here either.



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Old 1/27/11, 9:44 PM
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Chuck Evans Chuck Evans is offline
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Default Re: Exterior tankless water heater vent clearance

12 inches (US) 36 inches (Can) according to the manufacturer's document that Brian posted. Clearance requirements for listed appliances will be in the manufacturer's installation documentation. Just make sure you reference the right document for the model installed.



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Old 1/31/11, 11:46 PM
Allan Gallatin, #53277 Allan Gallatin, #53277 is offline
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Default Re: Exterior tankless water heater vent clearance

Quote:
Originally Posted by kwood View Post
Propane is heavy and will sit in pockets in your basement. You cant smell it unless you sniff the floor. It travels quickly with air movement. The installation shows its being installed in the basement.
It can be installed by the homeowner.
The tanks can be played with.
The tank can be installed inside by amature.
CO detectors may be placed too high to be effective.
CO detectors may not be sensitive enough.
If you take any safety training on Propane, natural gas and oil
you can bet your intructors will explain more to you.
All this because you say it can be installed according to code.
Remember as inspectors we don't even mention codes.
How many installers do you know fallow logic and not manufacturer installation?
Just because it says you can have 18 inches clearance from combustibles
will you try to go as close as 18 inches?
Yes , this is for sure ! Has been in many articles years ago when propane was causing homes to blow up due to being heavier than air . It stayed low in the basement and built volume until the furnace pilot light ignited it .



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