Rheem/Richmond XR90

[maverick]

I saw a few recommendations on this forum for the XR90. I had already been interested in it, so that was one of the things that encouraged me to buy it.

I was hoping that some of the members on here could help out. Maybe hausdok can chime in, as he seems knowledgeable about this this model, and in general.

First off, I understand the importance of proper venting. Which is why I'm asking the question upfront. In reviewing the instructions it specifies b-vent. Is this necessary or will a single wall 3 inch liner work? I ask because I already have a 3" liner in my "non-external" wall chimney.

My chimney is capped at the top and the bottom and has a 3 inch (I assume single walled) liner.

Will this setup work, or is it recommended that I replace the liner with a 3 inch b-vent? The rise is nearly straight up, will be approx. 20ft length.

What I'm getting at is whether documentation just states b-vent, because in modern construction it is most common, but is it synonymous with a equivalent sized lined chimney?

Your help is much appreciated,

Mike

[Scottpat]

You need to use "B" vent pipe. Single wall pipe will allow the flue gases to cool quicker and not rise/draft properly. The double wall "B" vent pipe keeps the gases warmer which helps to make them rise out the top of the flue pope.

[Marc]

If I'm not mistaken, this is an induced-draft water heater. No worries about getting sufficient draft.

'Liner' suggests a vent for a solid fuel burning appliance but I've never heard of one that measures only 3 inches across.

Marc

[Scottpat]

If I'm not mistaken, this is an induced-draft water heater. No worries about getting sufficient draft.

'Liner' suggests a vent for a solid fuel burning appliance but I've never heard of one that measures only 3 inches across.

Marc

The install requirements are pretty clear:

http://www.rheem.com/documents/xr90-1437--xr90-venting

[maverick]

Thanks for the help guys.

I'll just have to run b-vent through my chimney. Shouldn't be an issue since it's the only thing the chimney is being used for.

Unless someone suggests otherwise, I'll go with 3". As mentioned, total rise will be 20' give or take.

[maverick]

Hello again,

Long story short, I didn't end up installing the water heater earlier this year as I had planned.

Intending to get it done before winter hits.

I found this, and looks like it might fit the bill, but maybe someone can chime in.

http://www.menards.com/main/heating-coo ... c-9462.htm

http://www.ameri-vent.com/products/alk/kits

Looks like it is a double walled, b-vent flex pipe. So would this work running from my XR90, through the fab'd sheet metal chimney and exiting at the rooftop?

Thank you in advance.