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Casserole Door - an innovative door for batch box rocket mass heaters

 
gardener
Posts: 1795
Location: Kingman, Arizona
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Great job Bob! Really appreciated reading your posts about your experiences with the building and operation of your DSR. Highly recommended to anyone interested in thinking about building one.
 
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Does anyone have updates to share about casserole lid doors? I love the simplicity of this solution but am wary about their longevity and safety.
 
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Some have had no problems and others see them break fairly often. It could be due to the material/brand or those who see breaks might be touching the hot glass with a cold and wet glove which causes thermal shock. As you can find lids used for $5 or less, I would give it a try and see.
 
pollinator
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My breakages  seemed to be more connected to accidental drops/bumps weakening the structure of the glass and then it was more likely to break when it got hot. I also tried some of the flatter glass fry pans, and they have a better handle to grab that stays cooler. I never actually broke any of them.

Theoretically, the expansion coefficient of ceramic glass should not pose a hot to cold breaking problem, but i agree that exact quality of random cookware is likely not reliable .

But if you can afford it, buy ceramic glass, and weld up  a more conventional type door, and /or keep on the lookout for an old stove you can salvage a door from.

I finally had afriend weld up a door for me, paid for the real water clear ceramic glass -cut to order- and it is so nice to have a tight latch and easy hinge. That works real well for the DSR2 that I built. A history of my builds
 
This tiny ad dresses like this just to get attention:
Rocket Mass Heater Jamboree And Updates
https://permies.com/t/170234/Rocket-Mass-Heater-Jamboree-Updates
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