Does it matter where the stack thermometer is placed?

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
Status
Not open for further replies.

pro5oh

Member
Aug 19, 2008
150
downeast Maine
Hi all, got a 30-nc with about 3' of single wall pipe before the thimble. Been keeping the thermometer about 8" up from the outlet of the stove. Just wondering if it should be higher. Wheres yours?
 
Some say 24-28 inches..I dunno.
 
I like mine just above the flue collar. Put it where you feel comfortable having it, and then get to know what it and the stove are telling you. On both of my step-top steel stoves, I have a mag thermo on the lower top and another on the single-wall pipe just above the stove's flue collar. I've learned to burn this way. You'll figure out what works for you. Rick
 
18 inches on mine well maybe more like 20-23.
 
it's all relative. Most say 18 inches up, but you can put it anywhere so long as you compare it to what the fire looks like it is doing and some common sense.

pen
 
Ditto on the manufacturers recommendation of 18" above the top of the stove! I measured it, and drilled it that way.

By the way, you will also note (at least on Condar's products) that they have a life expectancy of 2 years. I dunno if that's just a way for the manufacturer to ensure that you'll buy another one, or if it's legitimate. Worth noting, anyway.

-Soupy1957
 
As mentioned . . . most seem to recommend 18 or so inches up from the stove collar.
 
I was told 18-20" up from the collar, so that's what I use. Best thing about that is that you have a reference temp that matches most folks here because that's where most put it. When someone tells they have a stack temp of 400º, it helps to know where it was taken on the pipe matches where yours is.

Personally, I'm much more interested in what my stack temp is halfway up, but I'd have to bore a hole through an upstairs wall and two layers of brick and a clay-tile flue in order to do that.
 
Battenkiller said:
Personally, I'm much more interested in what my stack temp is halfway up, but I'd have to bore a hole through an upstairs wall and two layers of brick and a clay-tile flue in order to do that.
So whats stopping you? :cheese:
 
Assuming you mean an actual flue thermometer, the probe type that reads flue gas temp: This measuring device was designed for a particular height above the flue collar to ensure dependable reporting of a temperature that you want to know about. Anything other than following the directions means you may as well wipe the numbers off of the dial as they mean nothing.

Surface mount: Only tells you the surface temp of metal. I would put it in the middle of that vertical section you describe. Know that you aren't reading flue gas temps directly so you can pretty much do what looks nice.
 
Status
Not open for further replies.