Power Vent Location?
Starting to explore a dhw heater with a power vent. Having a challenge to see where the exterior exhaust port can be placed in relation to widows etc.
Advice would be great!
Thanks!
Comments
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Venting is covered in the IOM of the appliance.
Why power vent, why not through the roof?
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This would be in the basement.
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ok
Why side vent and not roof?
make and model would help
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JUst starting the search. So no model per se. Again the unit would be in the basement and it is not feasible to go through the roof as this is a 2 story home.
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I do have a chimney flue available but the timeless is quite low. Maybe I will do some searching for a short enough unit that is atmospheric vented.
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Hi, You might look into direct vent heaters if you can put the tank up against an outside wall. They don't need electricity and are far simpler. The problem of venting near any openings in the wall… and snow, are still concerns.
Yours, Larry0 -
???
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The concern I have is when I check the measurements on a number of different units, wi atmospheric venting, it indicates that 12" of vertical rise is required before an elbow. So this is where a shorter unit would be needed.
Larry, I
Ike the idea just have to look at my space to see if I can make it work. Too many windows a deck along the back of the house. The side would require going through the masonry because of the joist orientation.
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Hi @Cyclist77 , Here's some info on Rheem:
They show the 90 degree ell directly on top of the tank, just like the one I installed for myself 😎 There is some rise to the fitting, but no need for a foot of straight pipe before the fitting. About creating a hole in a cement wall, search the phrase "concrete core drilling" and see if anyone locally does this work. With the right tool, a very clean cut is made pretty quickly. About venting under a deck, I'd call Rheem. Their plumber support line is 866-339-2388. Not sure they will talk to mere mortals, but it can't hurt much to try.
Yours, Larry
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Are you in snow country? If so a hole through a cellar wall, below the rim joist may not fly.
I’m guessing that direct vent needs to be a foot above the ground also. Download the installation manual also.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
This is a direct vent appliance configuration. that means the the air intake and the exhaust is coming from the same outdoor location. The air intake on this appliance is under the cover where there is no hole on the rectangle
This is the one for power vent. that is where the appliance gets the combustion air from inside the building and only the exhaust is vented to the outside.
Some of the dimensions that were 1 Ft on the Direct Vent diagram will be increased to 4 Ft on the power vent application. What appliance are you thinking of using? Pick one and download the installation and venting instructions to see if you have the proper location to vent it.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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I don't think you can do much modification on those direct vent piping components? Even done properly, they smell when you sit near them. It is not a fan powered vent that blows the fumes away from the building.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Interesting thing about that.
I installed mine so it's above the snow 99% of the time in my area. However, my dad's power vented WH is installed through his foundation wall and it's only 2 feet or so above the ground. In his area the snow is above that height most of the winter. We were going to change it, but it melts the snow constantly and has never been an issue since 2006. No idea why his guy didn't install it through the rim up much higher, and easier, for that matter.
Apparently he often finds deer etc sleeping in the area melted / warmed by the WH exhaust.
Should you do what that guy did? Probably not. But, it was something I've noticed and wanted to share.His direct vent furnace is plumbed higher, and that actually has had a few nuisance issues with the intake so he keeps after that as well as clearance around the generator.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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I put a DV water heater (State) in my brother's house and it was great it lasted about 20-25 years.
When that let go, we found that State made the "same" DV water heater.
Picked up the new one and it was pretty much the same except it was a few inches taller due to the "new" energy requirements there was more insulation around the tank which raised the height and also the flue/air intake, so we had to raise the hole for the flue and do some patching. Luckily, we had no windows or snow height to deal with. It was in a utility room with a standard stud wall.
The elbow does go directly on the WH with no rise in height.
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Ed, those drawings are very helpful. Surprises me that the power vent requires more distance from a window than a direct vent.
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A direct vent doesn't cause any imbalance in air pressure inside the structure.
A power vent pulls air from inside the structure, and therefore could encourage exhaust to be pulled in via the window. That's my interpretation of it.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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