Is it safe to boil my DME in the borosilicate flask on my electric stove’s ceramic cooktop? I’m guessing so given the directions which say that after a 15 minute boil to place it in an ice bath to cool. sounds like pretty tough stuff.
yes
I’ve been doing it for the past 3-4 years with no problems.
I have a normal electric range with the coil heating elements not a glass top can I boil in the glass on top of my stove.
Would I have to use a heat diffuser? B I have heard if you put the flask on a traditional electric stove top u can crak them
you can crack them - twice if your me. 
Only once for me, but that mess was enough to convince me to boil in a pot, then xfer to a flask.
Thanks, all.
Just reading this thread, the answers seem to vary. Is it safe to say that:
Flask of boiling wort on traditional coiled electric element = bad.
Flask of boiling wort on a ceramic cook top with electric element underneath = no problem.
I have a ceramic cooktop and wouldn’t exactly say “no problem.” Make sure you have a nucleation point for the boiling to occur, such as a stir bar or some sort of stir rod touching the bottom.
Without a nucleation site, superheated liquid can build up at the bottom, setting up a rather unstable situation. A slight bump can cause all of the superheated liquid to vaporize in an instant, causing a hot-wort volcano.
How do I know this? Well, you may be able to guess. :-\
Use that little wheel thingy on your mouse and scroll up to re-read Denny’s post.
And I quote:“…but that mess was enough to convince me…”
Right, but the topic had already shifted to traditional coils at that point. So I didn’t know if Denny had tried it on ceramic or not.
I’ll probably stick to boiling in a pot and transferring, but wanted to be sure.
If I do try it, I’ll leave the stir bar in there as a nucleation site.
Yep…flat top ceramic. Took me hours to scrape off the burned on sugar.
Yet another thing Barkeepers friend is great for cleaning - ceramic cook tops.
A friend has the lab stand, the clamp to hold the neck of the flask, and a bunsen burner.
That is the what they are designed for, no?