Furnace/water heater flue questions


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Old 02-01-16, 02:03 PM
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Furnace/water heater flue questions

Have a split level home.

Lower level is approximately 4' below grade all around, maybe slightly lower on one side of house.

Current setup in utility room looks like the images here:
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On the fence about replacing water heater and am just doing my own research on how flues are sized and such.

http://www.hartandcooley.com/files/a...Guide_0813.pdf

I found this document which seems to break it down.

I have a roughly 19' total vent height, appear to be 4" single wall for HWH and 4 or 5" type B for furnace.

I've been down there a bit cause my HWH pilot isn't staying lit and I feel like I'm hearing condensation drips in my flue. This is what made me look up proper sizing for this installation.

I know the flue looks flat on the long horizontal for the HWH vent, but it does have a very slight pitch. 1/4" per foot is probably a bit of a stretch but it definitely pitches properly.

Had my annual furnace service last weekend, and the tech was making such a big deal about the venting of the current setup. Other then possibly using a Y connector at the flue, I'm not sure I really see what the concern is.

This was a new tech. Like owner of company, who came out last 2 services, but not too sure of this guy. May ask owner to come do a follow up as part of quote for new HWH.

Any thoughts? I'm really just looking to learn and get feedback. No real question here.
 
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Old 02-01-16, 04:47 PM
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A pilot not staying lit is likely a bad thermocouple. I do not think it has anything to do with the venting. Thermocouples are about $7 and found at most big box and hardware stores.
 
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Old 02-01-16, 07:44 PM
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If you were getting condensation in the flue, you would likely be seeing rusted spots on the underside of the vent pipe.
 
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Old 02-02-16, 11:47 AM
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but the pilot stays lit for anywhere from 12 hours to 5-6 days. still think its a thermocouple?

I sent soem of these pics to a few highly rated plumbers and got a comment back that the tape used is not allowed and possibly $2-300 worth of work in flue repairs.

waiting for HVAC guy to get back to me.

I'm confused on what the issue is.
 
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Old 02-02-16, 02:42 PM
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Tell your "highly rated" plumbers to take a long walk off a short pier. They jump all over a little bit of tape which will hold up just fine yet say nothing abut the gaps where the sections of pipe are joined together.
 
 

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