Direct Vent Vs Power Vent Water Heater - Plumbing - Contractor Talk

Direct Vent Vs Power Vent Water Heater

 
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Old 09-11-2018, 07:39 AM   #1
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Direct Vent Vs Power Vent Water Heater


Given the choice between the two, which would you chose? Must go through rim joist. Tankless is a negative. Water heater will be in basement against foundation wall.
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Old 09-11-2018, 08:46 AM   #2
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Re: Direct Vent Vs Power Vent Water Heater


I have a power vent in my house and I remember reading it someplace that the main difference is between the 2 is that the power vent removes combustion gases from the atmosphere using a fan and chimney vent releases gases into the outdoor atmosphere via the chimney.

Another good benefit of having a power vent is that you can install your water heater anywhere in the house if chimney access is not available.

The only downside that I see is the cost, since its using electric and if the power is out and you have no generator you be without the hot water in the shower.

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Old 09-11-2018, 07:30 PM   #3
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Re: Direct Vent Vs Power Vent Water Heater


Additionally sometimes a power vent is a little loud if it's right under a bedroom or living room and sometimes a chimney vent isn't a good option if it's not properly lined as the gasses will deteriorate a masonry chimney, iirc.
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Old 09-11-2018, 08:25 PM   #4
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Re: Direct Vent Vs Power Vent Water Heater


https://haleymechanical.com/blog/dif...water-heaters/
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Old 09-11-2018, 09:05 PM   #5
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Re: Direct Vent Vs Power Vent Water Heater


No chimney, I took it out. I have access to direct vent that uses a non powered concentric vent through the wall. Similar cost to power vent. Close to $1000, vs $400 or so for a natural draft chimney vent.
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Old 09-11-2018, 09:06 PM   #6
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Re: Direct Vent Vs Power Vent Water Heater


Example: https://www.bradfordwhite.com/direct-vent-gas-models
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Old 09-12-2018, 06:53 AM   #7
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Re: Direct Vent Vs Power Vent Water Heater


A true direct vent with combustion air pulled from the outside via pipe wins hands down - better efficiency, no chance of back drafting, etc... The only thing to watch out for is the condensate - where is it going, etc...

As for power vents - one with a metal exhaust or pvc - pvc same issue as above, metal you need to make sure it doesn't form in the liner but then you are also looking at a larger hole so that would probably rule out that type of model

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