WT*

You tell me?

Comment

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

Comment by Eric Kjelshus on July 15, 2014 at 6:44am

I took 3 HOBO's and put in flue gas B1 pipe very top - mid way - at breaching ( in basement)  with a over sized 80% my house before change out but after sealing and high R was done, when from R-13 attic to R49 and sealed all holes walls from r-6 to R-20 and sealed with new windows.  went from 97,000 BTU to 34,000 BTUs/hr at 0'  I took the stat at 1' droop  and put a 5 gal bucket  under the hoz run.  At top of flue pipe never got to 250' and stayed  wet the whole time.  I rotted the flue/furnace/ in 4 mo.   You have to dry out the flue each hour to keep the pipe from just coming apart and fall down.  If you keep flue gas ( in my case) above 265'  with both hot water heater and furnace  above 265' will dry out the flue and will last very very long time.  I do my best to keep the flue gas temp as high as I can, Its the heat that's keeps the flue gas up the flue and out of the building,  unless you use a power vent  or PVC flue pipe.   

Comment by Bob Blanchette on July 14, 2014 at 7:40pm

+1 if flue gasses are too cool it will simply rot the pipe out. That's a big reason that double wall pipe (b vent) is used even when it's not required by code for low clearance.

Comment by Eric Kjelshus on May 28, 2014 at 7:07pm

I saw this a lot in the 60-70'.   not so much with 95% furnaces.   This will drop the flue temp some 100'  then the flue will condensate - stays wet then it just rots  outside in.   For fun turn the stat up to 85'  then use the IR photo to see heat loss.    Then look at temp at top of flue if under dew point then drip.  This will just rot the boiler/furnace/hot water and flue pipe

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Hal Skinner replied to Richard Beyer's discussion Spontaneous Combustion and Flash Fire regarding Spray Foam Insulation
"Richard, here is something else that might be pertinent. In my hundreds of conversations with our…"
8 hours ago
Trip posted a discussion

Starting a Home Weatherization Business. Considering it...

I am considering starting a home weatherization business. (I live in Southeast Alabama)  Currently…See More
9 hours ago
Jim Gunshinan commented on Jim Gunshinan's blog post My Energy Upgrade California—The Numbers Are In
"To all, one thing I don't lack is advice from the experts! Thanks for the input, challenges,…"
10 hours ago
tedkidd commented on Jim Gunshinan's blog post My Energy Upgrade California—The Numbers Are In
"Jim, I'm glad you are open, that's great!  We all learn best when we are open! The…"
10 hours ago
David Eakin commented on Jim Gunshinan's blog post My Energy Upgrade California—The Numbers Are In
"Jim, Well, as the editor of Home Energy you should already know that the order of remediation is…"
10 hours ago
Greg Labbe posted a blog post

Technical Tape Desecration

Lets face it – building science is pushing the performance of adhesive tapes to a new levels and…See More
12 hours ago
Stacy Hunt posted an event

High Performance Enclosure Strategies: Part II, New Construction at Online

August 13, 2014 from 1pm to 2:30pm
Please join the Building America Program for our free webinar: High Performance Enclosure…See More
14 hours ago
Richard Beyer replied to Howard Katzman's discussion UV lights on filters
"Howard, There are numerous manufacturer's who swear these systems work and then you have the…"
23 hours ago
Christopher Morin posted a blog post

How do You Test a TXV?

  Thermostatic Expansion Valves (TEV or TXV), one of the most popular metering devices for…See More
yesterday
Howard Katzman posted a discussion

UV lights on filters

I recently saw UV bulb installations in 2 HVAC systems in a home. Each system had the Lennox…See More
yesterday
Don Fitchett joined Michael Stuart's group
Thumbnail

INFRARED THERMOGRAPHY USERS

This group is dedicated to knowledge sharing and discussion of infrared thermography for building…See More
yesterday
Don Fitchett commented on Diane Chojnowski's group Pinterest
"While most of our (BIN95.com) energy post and boards are industrial related, there are crossovers…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service