I have a lab grade probe and a couple of Rutland thermometers. I have a small fire going to take the chill off. Probe is close to 500. Rutland below it is 200 and stove top Rutland is 450. It is a lazy little fire but hot enough to not make creosote, some well seasoned maple and birch rounds so nothing serious. I woke up a bit cold at 3:30 am so the reason to start a small one. It has to make you wonder how many millions of cords of wood that have been wasted trying to keep a cheap thermometer happy.
Crappy magnetic thermometers
- Thread starter ddahlgren
- Start date
-
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
madison
Minister of Fire
? Interpreting your comment - "Probe is close to 500. Rutland below it is 200 and stove top Rutland is 450."
1. The probe is measuring internal flue temp - I assume - and the "Rutland below it is reading 200" as a surface temp on the chimney? If yes, I would expect them to be different - especially so if the Rutland is placed on double wall pipe. Even if it is single wall pipe, you are measuring two different things.
2. Stove top Rutland is 450.
Suggestion - place the two Rutlands side by side, on the stove top. And see if they match. If they do not, place them all in the the oven, and adjust the dials to match.
1. The probe is measuring internal flue temp - I assume - and the "Rutland below it is reading 200" as a surface temp on the chimney? If yes, I would expect them to be different - especially so if the Rutland is placed on double wall pipe. Even if it is single wall pipe, you are measuring two different things.
2. Stove top Rutland is 450.
Suggestion - place the two Rutlands side by side, on the stove top. And see if they match. If they do not, place them all in the the oven, and adjust the dials to match.
Beer Belly
Minister of Fire
I gave my Rutland the boot (actually use it on the side, just for the heck of it), and got a Condar that is running pretty close to the IR Meter. We also lit the stove for the first time of the season this morning in my SE Corner of Ct
I think the real problem with any that are flat and magnetic is the fact they are flat on a round pipe. It allows room air to circulate behind them and cool the bi-metal used to measure the temp. Laying flat on a flat surface the keep the heat in. The two I have read very close to each other on the top of the stove.
Bluerubi
Burning Hunk
My rutland is awful, close to 150F off at cruising temp on my stovetop compared to my IR thermometer. My Condar Inferno is within 25F in the same location on the stove.
I have an old condor which is within about 50 degrees up to 500 and then it can be 100 degrees or more off, the new ones I bought are worse and one of those is a rutland.
I have a Rutland and a Condor and they both read the same when placed next to each other on the middle of my step. (both stoves are step top) I don't use them for more than an indication anyway.
Look through the window and you'll see immediately if the stove is burning cleanly. The fire will be lazy, balls out or somewhere inbetween. There is smoke visible in the firebox or not. I've never seen a lazy fire overheat a stove. I've never seen a balls out fire that I didn't want to keep at least a little bit of an eye on. My nose and ears tell me if I needed to move more air over the stove to cool it off or put more tubs of water on it to keep it cool.
Matt
Look through the window and you'll see immediately if the stove is burning cleanly. The fire will be lazy, balls out or somewhere inbetween. There is smoke visible in the firebox or not. I've never seen a lazy fire overheat a stove. I've never seen a balls out fire that I didn't want to keep at least a little bit of an eye on. My nose and ears tell me if I needed to move more air over the stove to cool it off or put more tubs of water on it to keep it cool.
Matt
Todd
Minister of Fire
Teltru has a good magnetic therm that doesn't have all the colored burn zones, just a plain Jane white face with black numbers. It seems quicker to react and more accurate than my Rutlands or Condars.
Seasoned Oak
Minister of Fire
Is this the one, looks nice but I would like to have more range then that.
http://www.teltru.com/s-54-dual-magnet-thermometers.aspx
Sprinter
Minister of Fire
Can you show a pic of the layout?
A few general observations:
1. For flue thermometers, it's important to be the correct height above the stoves as per the manual. That's where the manufacturer calibrates them.
2. Stove top temperatures can be quite different at different locations on the top, even a few inches away, especially when the fire is young.
3. None of these inexpensive thermometers are very accurate.
4. The consensus on the forum seems to be that Rutlands are less reliable than Condars. Don't know why.
`
A few general observations:
1. For flue thermometers, it's important to be the correct height above the stoves as per the manual. That's where the manufacturer calibrates them.
2. Stove top temperatures can be quite different at different locations on the top, even a few inches away, especially when the fire is young.
3. None of these inexpensive thermometers are very accurate.
4. The consensus on the forum seems to be that Rutlands are less reliable than Condars. Don't know why.
`
Todd
Minister of Fire
I can't get my phone to open that link but This is the one I have. It goes up to 750.
Last edited:
Seasoned Oak
Minister of Fire
500 Deg is not very usefull for the stovetop, all my stove tops cruise higher than that. I keep all my temp gauges on the stovetop. I guess its OK for the flue pipe.
Sprinter
Minister of Fire
Note that a regular surface thermometer will not be very useful for flue temps on a stovepipe. Makers of flue thermometers like Rudland and Condar know that the surface of the pipe, even single wall, will be much less than the temps inside the flue, so they have to specifically design and then calibrate them accordingly, and they have to be installed at the right height, so that they hopefully will record what the inside temp is. But it's still an indirect measure and the accuracy will be limited.
They should be fine for stovetops, though, since the surface temp is what you are concerned about.
They should be fine for stovetops, though, since the surface temp is what you are concerned about.
Oregon aloha
Feeling the Heat
I looked at there ratings online and found this forums observations of these two brands match other consumers outside of this forum. Consumers rank the Condars as better, but neither one is set accurately form the factory.
Seasoned Oak
Minister of Fire
The only way to get an honest stove top temp is with the paint sanded and heat sink compound between the top and the sensing surface of the gauge,
Backwoods Savage
Minister of Fire
On the other hand, one sometimes wonders how so many folks got along for so many years with no thermometers. Personally, I never used on until we bought our last stove. And I'll give another plus to the condar. We had some rutlands and threw them out.
Then one also has to realize that we aren't trying to keep a thermometer happy, we use the stove to warm our bodies and our homes. Let us never forget what we really want with a wood stove and that is nice heat.
+1 on that 750F Teltru. I've used that model for 2 or 3 years now. Very accurate. Very responsive.
brenndatomu
Minister of Fire
Yeah, and a lot of people don't realize that IR thermometers are most accurate on flat black (non reflective) surfaces
- Status
Similar threads
