The glass shop did carry pyro. One of the few in the area that does. The local windshield places didn't have it. Been burning strong all week. The more I'm using this stove the less I'm liking the large glass because now I am paranoid with every log I place in. I'm kind of wanting that Tremont back...
How often does glass break?
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The glass shop did carry pyro. One of the few in the area that does. The local windshield places didn't have it. Been burning strong all week. The more I'm using this stove the less I'm liking the large glass because now I am paranoid with every log I place in. I'm kind of wanting that Tremont back...
I agree "I broke it" but it was a log rolling a half turn. I've had that happen dozens of times on my old Tremont over the years. The Manchester has a side load door which is why I purchased that model. It burns great. Puts out good heat, easy to keep stoked an has a nice ash pan. I keeping looking at that large glass door. It is fun to watch the fire but its a lot of glass to be careful with...
ridemgis
Feeling the Heat
Check out this video from Kuma stove:
The ceramic will handle a direct hit without breaking, but it doesn't bend well. So a log rolling into it will do no harm. Force the door shut against an oversize split and you are toast. And no I don't plan to test this on my stove!
The ceramic will handle a direct hit without breaking, but it doesn't bend well. So a log rolling into it will do no harm. Force the door shut against an oversize split and you are toast. And no I don't plan to test this on my stove!
The BKs you mention are very square and designed primarily as north/south burners. As such nothing to worry about.
Great video . . . and it shows what some of us have stated about the durability. That said . . . I must confess that I cringed every time with every hit.
ridemgis
Feeling the Heat
Me too! The first time he hit it I about leapt out of my chair! I wake up in the night thinking that thump I heard was a split falling hard against that huge fragile window. Actually it's my shift working neighbor slamming his car door at 4am.
Having a second window break would be like winning Megabucks a second time.
You've had your once in a lifetime event. Get some sleep.
PercivallPotts
New Member
The reason regular glass and even pyrex glass is sensitive to thermal shock is two fold. It has a relatively large coefficient of thermal expansion (gets larger as it gets hot and smaller as it gets colder) and it has a relatively low thermal conductivity (does not conduct heat very fast the way metals do). With these two properties combined, a hot glass that is cooled in a small area by a splash of water or a random snow ball results in cold spot that shrinks and pulls on the surrounding material (tensile strain). Since the glass does not conduct heat to the cold area very quickly the thermal strain grows much faster than thermal conduction can relieve.
With the high temps in the burn box of wood stoves this can result in tremendous internal strain. Since glass is a non-compressible/ stretchable material it can only take a limited amount of strain before it shears / cracks. Couple that with a retaining clip / screw that is just a bit too tight and hot burn... the metal in the door expands more than the glass resulting in a pressure point (internal strain) on the glass and then the thermal shock puts it over and Wa-La. A crack runs through it.
Ceramics are not this way, they have virtually zero thermal expansion coefficient therefore the difference in temperature in v. hot area and v.cold area causes very little internal strain. The transparent ceramic window used in modern wood stoves is quite stable to thermal shock. (As others have noted)
I did learn something new about how impact resistant they are from that video, THANKS. I bet it would be a different result if he used a harder object and not a soft 2x4...
With the high temps in the burn box of wood stoves this can result in tremendous internal strain. Since glass is a non-compressible/ stretchable material it can only take a limited amount of strain before it shears / cracks. Couple that with a retaining clip / screw that is just a bit too tight and hot burn... the metal in the door expands more than the glass resulting in a pressure point (internal strain) on the glass and then the thermal shock puts it over and Wa-La. A crack runs through it.
Ceramics are not this way, they have virtually zero thermal expansion coefficient therefore the difference in temperature in v. hot area and v.cold area causes very little internal strain. The transparent ceramic window used in modern wood stoves is quite stable to thermal shock. (As others have noted)
I did learn something new about how impact resistant they are from that video, THANKS. I bet it would be a different result if he used a harder object and not a soft 2x4...
Heck, I said a four letter word! and it wasn't "fudge"..
"How often does glass break?"
Only once, usually...(sorry, I couldn't resist).
Only once, usually...(sorry, I couldn't resist).
Ah another reason to love a north to south loading stove. No broken glass, unless you try to close the door against a pc that is too long.
Sorry, just not enough to wish to going back to an old smoke dragon.
Not the stoves fault.
Sorry, just not enough to wish to going back to an old smoke dragon.
Not the stoves fault.
My old stove has glass in the doors. 21 years of burning in the house and eight years burning in the backyard and still going with the original glass.
fitter9
Member
the wife and i went to atlantic city for the weekend 2weeks ago. the first thing we wanted to do when we came home was fire up the stove. while i was out in the yard getting kindling she was sweeping the hearth around the stove. this is a thread about broken stove glass so guess what happened?? she came outside almost in tears and said she hit the open door with the broom and cracked the glass. i was so mad i had smoke coming out of my ears. still waiting for the glass from the dealer. the ups delivery was delayed because of the latest snow storm. the gas fired steam boiler has been running non stop just to keep the house at 63. my gas and electric bill has only been about 550$ total since i had the stove installed in october. its going to be that much just for the month of feb. if that glass doesnt get here soon. i just showed her that video from Kuma stove and i asked her how hard she was sweeping. i thought it was funny.....she did not 
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![[Hearth.com] How often does glass break?](https://www.hearth.com/talk/data/attachments/127/127559-f794f8d15d568d2fd4f5afa7ba4a176b.jpg?hash=Ecw2Nez5kn "[Hearth.com] How often does glass break?")
husky345 vermont resolute
Feeling the Heat
the wife and i went to atlantic city for the weekend 2weeks ago. the first thing we wanted to do when we came home was fire up the stove. while i was out in the yard getting kindling she was sweeping the hearth around the stove. this is a thread about broken stove glass so guess what happened?? she came outside almost in tears and said she hit the open door with the broom and cracked the glass. i was so mad i had smoke coming out of my ears. still waiting for the glass from the dealer. the ups delivery was delayed because of the latest snow storm. the gas fired steam boiler has been running non stop just to keep the house at 63. my gas and electric bill has only been about 550$ total since i had the stove installed in october. its going to be that much just for the month of feb. if that glass doesnt get here soon. i just showed her that video from Kuma stove and i asked her how hard she was sweeping. i thought it was funny.....she did not
So inquiring minds want to know ... did you win enough at Atlantic City to pay for the new glass?
fitter9
Member
lets see..losses in ac, the broken glass, and the huge gas and electric bill. the wife might have to get a second job.
I have relatively small pieces of glass on a double door of my CDW Federal Airtight and one pane was broken with a hockey puck, fortunately, not during the winter. The stove has some pretty good grates in front of the glass, but I have wondered what I should do if the glass ever breaks while I am burning.
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