Viessmann 100-W install for radiant heat- Coxial Venting?

[hellspcangel911]

Hi All,
I purchased a B1HE 85K unit for the radiant in my shop and am planning the install, but having a really hard time finding a coaxial vent system for it. I spoke to Viessmann and they noted I need atleast a 3' vent stack in addition to the first elbow. I had been planning to go straight out the shop wall which is only 10". I could not find this requirement anywhere in the factory literature- and neither could the rep.
They did provide the attached parts list for the venting system, at 80/125 I need the 7571.784 384 kit. This would allow me to use part #3 coming straight up from the boiler, into elbow #2, then termination kit #3 which can be trimmed down so its not sticking out the wall 2'.
I cant find any information on the kit, non of my 'local' shops can find the kit or coaxial parts that would fit. Even the supply house that sold me the unit cant locate any venting pipes. To the point they offered to return the unit and sell me a Navien.....

I see SupplyHouse and other online retailers have coaxial systems but I dont know if they are compatible. Any help in located a venting system thats compatible would be greatly appreciated.

Thank you

 

[Jackfre]

Why haven’t you called Viessmann?

 

[hellspcangel911]

Why haven’t you called Viessmann?

I did, twice. they provided the page above and stated I need a minimum of "3 to 4 feet of linear run, not including a reduction for the first elbow" i asked if they could cite that in the literature, and he put me on hold, came back said he spoke to a "more senior tech who stated 3' would be sufficient". They directed me to Sid Harvey as my local supplier, which is unable to find any of these parts.
I noticed on the sheet they provided the prices are in CAD, so I'm assuming these are not readily availble parts in US, much the same way I could locate their parts in EU.
I called back asking for alternative part numbers and the rep was unable to find other parts, or cross reference parts from other manufacturers.
I know this is a popular boiler on here so I was hoping to get more info from members that installed it.

 

[road_king]

I googled 3" coaxial boiler vent and there were 3' options that came up. There is even a 1 meter NOS Viessmann currently up on ebay

That's a great boiler you have there. Have had a viessmann vitodens 100 combi for radiant and DHW in my shop since 2018 and has worked flawlessly thus far

 

[hellspcangel911]

Will any 3” work or Does it need a special locking ring/groove? Obviously Viessmann said it needs to be their brand

 

[road_king]

google viessmann 7571.784
Theses kits are out there and available

 

[hellspcangel911]

SupplyHouse.com is out of stock (and hasn’t had it in stock for the last three months). I called them and they don’t know if they will get it back in stock.
The other links coming up are all overseas. One Canada seller doesn’t actually have any in stock though the site says “low stock”.

 

[PoorUB]

Can you buy a similar, acceptable termination in Duravent? Often these high efficiency units don't manufacture their own venting, but sell venting manufactured by another company.

 

[Jackfre]

Ok, call them again. Tell them your story and if a guy has tospeak with a more senior guy tell him you want to talk to that guy. Veissmann is a really good outfit and did not get that way with this type service. Don’t go nuts, just demand a bit of consideration.
In looking at their web site they list Ferguson and The Granite Group. They were my customers for years and will likely have the material you require.

 

[fitter30]

Will the supply house you purchase the boiler make a call to engineering or a factory service person that takes care of your area. Not everything is in a install manual.

 

[98ssuck]

My info on these is an about a decade out of date. I used to install lots Viessmann 100 and 200 series boilers before more or less getting out of gas. At one time i even got trained at our regional viessman office. So I did a quick google refresh. Here’s my interpretation.

The viessman venting is proprietary. If you want to use a more generic option you have to buy their 2 pipe adapter.

If they say a minimum of 3’ of vent. Use the minimum of 3’ of vent or add an extra elbow or two to get the equivalent amount of at least 3’ of vent.

The concentric vent needs to be run at a 3* slope towards the boiler. But don’t worry viessman though of this. The elbows are not 90* they are 87* elbows. Getting the slope right was always crucial for the vent not to leak.

I always got my parts from viessman directly. This was in bc, Canada. Not sure where you are.

 

[caleb383]

Hi All,
I purchased a B1HE 85K unit for the radiant in my shop and am planning the install, but having a really hard time finding a coaxial vent system for it. I spoke to Viessmann and they noted I need atleast a 3' vent stack in addition to the first elbow. I had been planning to go straight out the shop wall which is only 10". I could not find this requirement anywhere in the factory literature- and neither could the rep.
They did provide the attached parts list for the venting system, at 80/125 I need the 7571.784 384 kit. This would allow me to use part #3 coming straight up from the boiler, into elbow #2, then termination kit #3 which can be trimmed down so its not sticking out the wall 2'.
I cant find any information on the kit, non of my 'local' shops can find the kit or coaxial parts that would fit. Even the supply house that sold me the unit cant locate any venting pipes. To the point they offered to return the unit and sell me a Navien.....

I see SupplyHouse and other online retailers have coaxial systems but I dont know if they are compatible. Any help in located a venting system thats compatible would be greatly appreciated.

Thank you

Running into clearance and venting restrictions like that is super frustrating when the manual doesn't make it clear. Hopefully, you can track down a compatible coaxial kit so you don't end up having to swap out the whole unit.