Tankless common venting
I just seen an install of 4 tankless on the main wall. Looks like a real nice job, but I noticed that all 4 are being common vented with the fresh air being taken from the room. I just checked with Noritz and they say they do not allow common venting. I have a few jobs that if we could common vent, the tankless units would work, but we cannot go individual. Do you know what manufacturers if any allow common venting on their tankless units.
Thanks
Not Noritz
Sprinter,
Those are Eternals.
Bob
You can choose to do what you want, but you cannot choose the consequences.
This post was edited by an admin on February 14, 2011 7:54 PM.
Ok that's one
Are there any others that can be common vented.
Heres what
the factory states about Eternal:
Good Morning Mr. McElwain,
Thank you for your interest in the Eternal Advanced Hybrid water heaters.
The GU195M unit, which is designed for use in multiple unit applications, can be common vented for exhaust. Up to four units can share the same exhaust pipe. If you were to do this, you would need to utilize 6" PVC piping for the common run (rising to the run from each unit would require 3" PVC). If you are drawing the combustion area from the space around the units, you would be able to have a maximum run length of 60 feet with a total of 5 90 degree elbows (deducting 5 ft from the run for each elbow).
I have included with this email a copy of the Eternal's Installation and Operations manual, which includes all of our installation specifications for the Eternal, including for multiple unit installs. If you have any further questions, please feel free to contact Grand Hall.
Andrew Hall
Inside Sales
Grand Hall USA, Inc.
T. 866.946.1096
F. 972.279.8440
[u]www.eternalwaterheater.com[/u]
Venting options for tankless water heaters
There are many venting options available on the market today for gas tankless water heaters, including direct-vent, no vent, etc.
On the other hand, another choice is electric tankless water heaters. They do not require venting, and if electricity costs are low in your area, it might be a good option.
I'm currently working on comparison table of several gas tankless water heater models and will post it in 2-3 days. It might be helpful to compare venting options:
http://www.tanklesswaterheatersbuyingguide.com/
