Does the glass Jena flame proof kettle for use on electric range
required a 'trivet' for the burner or can it sit directly on a ceramic
top?

Thanks,
Jim

On 1 Aug 2005 06:24:06 -0700
"Space Cowboy" > wrote:

> Does the glass Jena flame proof kettle for use on electric range
> required a 'trivet' for the burner or can it sit directly on a ceramic
> top?


My guess is that ceramic cooktops constitute a trivet of sorts in the
first place.

I think the little wire dingus for putting between electric coils and
glass cookware is intended to prevent the very small points of direct
contact between the irregular glass surface and the irregular coil surface
from becoming far hotter than neighboring points that are relying on
radiated rather than conducted heat. The irregular heat expansion could
theoretically cause breakage. fwiw, the thermal advantage of Pyrex over
most glasses is it's lower rate of heat expansion.

In as much as the ceramic glass plate on that style of cooktop serves as
a decoupling point between the heating element and the cookware, I think
it'd work just fine. There are still going to be points that are getting
direct conduction from the cooktop, but it's not going to be as intense as
sitting right on the coil.

I say 'think' because I've never tried. Can't stand those glass top
jobs. They stay quite hot for a long time after they look like they've
cooled off, and are ultimately harder to keep clean. They stain, and can't
be abrasively scrubbed.

That and I have a (probably irrational) fear that i could shatter the
cooktop with my beloved Griswold #9 cast iron skillet.

If i bought a house that had a glass cooktop I'd figure the cost of
ripping it out and replacing it with gas into the move-in budget.

On 8/1/2005 10:49 AM, Eric Jorgensen wrote:
> On 1 Aug 2005 06:24:06 -0700
> "Space Cowboy" > wrote:
>
>> Does the glass Jena flame proof kettle for use on electric range
>> required a 'trivet' for the burner or can it sit directly on a ceramic
>> top?
>
>
> My guess is that ceramic cooktops constitute a trivet of sorts in the
> first place.
>
> I think the little wire dingus for putting between electric coils and
> glass cookware is intended to prevent the very small points of direct
> contact between the irregular glass surface and the irregular coil surface
> from becoming far hotter than neighboring points that are relying on
> radiated rather than conducted heat. The irregular heat expansion could
> theoretically cause breakage. fwiw, the thermal advantage of Pyrex over
> most glasses is it's lower rate of heat expansion.
>
> In as much as the ceramic glass plate on that style of cooktop serves as
> a decoupling point between the heating element and the cookware, I think
> it'd work just fine. There are still going to be points that are getting
> direct conduction from the cooktop, but it's not going to be as intense as
> sitting right on the coil.
>
> I say 'think' because I've never tried. Can't stand those glass top
> jobs. They stay quite hot for a long time after they look like they've
> cooled off, and are ultimately harder to keep clean. They stain, and can't
> be abrasively scrubbed.
>
> That and I have a (probably irrational) fear that i could shatter the
> cooktop with my beloved Griswold #9 cast iron skillet.
>
> If i bought a house that had a glass cooktop I'd figure the cost of
> ripping it out and replacing it with gas into the move-in budget.

Talk about timely! I am in the process of buying a house that has a
ceramic cooktop stove. Having only ever had gas stoves, other than a one
year rental years ago that had electric, I'm less than thrilled, but
even less thrilled with the side-by-side refrigerator, which I always
think of as having little usable space. I guess I should figure that
both will be replaced sooner, rather than later, and maybe I'll be
pleasantly surprised. Thanks for this, Eric!

Resa

"Space Cowboy" > wrote in message
oups.com...
> Does the glass Jena flame proof kettle for use on electric range
> required a 'trivet' for the burner or can it sit directly on a ceramic
> top?

Putting glass on a ceramic cooktop is specifically dis-recommended by all
the manuals I've read. Glass and ceramic may fuse together, with chipping or
shattering on separation/cooling. Even high-temperature glasses (like
Pyrex/borosilicate) and ceramics may bond by diffusion or reaction. Metal in
between is safer.

-DM

That's what I understand when I read the fine print of the product
manual for my ceramic top. I was hoping someone would have a JENA
where it specifically said safe for ceramics. If it doesn't it ain't.
I was curious about their claim of flame proof. Any high temperature
glass with a trivet will work. I have my share.

Jim

Dog Ma 1 (reply w/o spam) wrote:
> "Space Cowboy" > wrote in message
> oups.com...
> > Does the glass Jena flame proof kettle for use on electric range
> > required a 'trivet' for the burner or can it sit directly on a ceramic
> > top?
>
> Putting glass on a ceramic cooktop is specifically dis-recommended by all
> the manuals I've read. Glass and ceramic may fuse together, with chipping or
> shattering on separation/cooling. Even high-temperature glasses (like
> Pyrex/borosilicate) and ceramics may bond by diffusion or reaction. Metal in
> between is safer.
>
> -DM

Space Cowboy > wrote:
>That's what I understand when I read the fine print of the product
>manual for my ceramic top. I was hoping someone would have a JENA
>where it specifically said safe for ceramics. If it doesn't it ain't.
>I was curious about their claim of flame proof. Any high temperature
>glass with a trivet will work. I have my share.

I have used a Jena on an open gas range for a good while and never had
any problem with it, but then the glass temperature is limited by the
water within it. If you put one on the stove dry, it would most probably
be damaged.

I don't use the Jena much, though, because it leaks too many leaves. Fine
with large-leaf teas, but with BOP, a huge amount of stuff winds up in
the cup. The Chatsworth plastic mesh is much more effective in that regard.

I know, leaves in the cup are just part of the charm.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

I just went through a kitchen remodel where I had the opportunity to
pipe in gas. That cost is nothing compared to everything else. I lost
the argument with you know who. She figured wiping up spills is easier
on a unitop. Now you can tell which burner I use for the pot. However
we didn't replace the side-by-side because it is the old model without
the ice chest. They all come with chilled water which takes up half
the space. It's the only appliance I'll get repaired. I visited
someone in the South where they fill their ice maker with bagged iced
because it couldn't keep up.

Jim

Serendip wrote:
> On 8/1/2005 10:49 AM, Eric Jorgensen wrote:
> > On 1 Aug 2005 06:24:06 -0700
> > "Space Cowboy" > wrote:
> >
> >> Does the glass Jena flame proof kettle for use on electric range
> >> required a 'trivet' for the burner or can it sit directly on a ceramic
> >> top?
> >
> >
> > My guess is that ceramic cooktops constitute a trivet of sorts in the
> > first place.
> >
> > I think the little wire dingus for putting between electric coils and
> > glass cookware is intended to prevent the very small points of direct
> > contact between the irregular glass surface and the irregular coil surface
> > from becoming far hotter than neighboring points that are relying on
> > radiated rather than conducted heat. The irregular heat expansion could
> > theoretically cause breakage. fwiw, the thermal advantage of Pyrex over
> > most glasses is it's lower rate of heat expansion.
> >
> > In as much as the ceramic glass plate on that style of cooktop serves as
> > a decoupling point between the heating element and the cookware, I think
> > it'd work just fine. There are still going to be points that are getting
> > direct conduction from the cooktop, but it's not going to be as intense as
> > sitting right on the coil.
> >
> > I say 'think' because I've never tried. Can't stand those glass top
> > jobs. They stay quite hot for a long time after they look like they've
> > cooled off, and are ultimately harder to keep clean. They stain, and can't
> > be abrasively scrubbed.
> >
> > That and I have a (probably irrational) fear that i could shatter the
> > cooktop with my beloved Griswold #9 cast iron skillet.
> >
> > If i bought a house that had a glass cooktop I'd figure the cost of
> > ripping it out and replacing it with gas into the move-in budget.
>
> Talk about timely! I am in the process of buying a house that has a
> ceramic cooktop stove. Having only ever had gas stoves, other than a one
> year rental years ago that had electric, I'm less than thrilled, but
> even less thrilled with the side-by-side refrigerator, which I always
> think of as having little usable space. I guess I should figure that
> both will be replaced sooner, rather than later, and maybe I'll be
> pleasantly surprised. Thanks for this, Eric!
>
> Resa

On 8/2/2005 12:12 PM, Space Cowboy wrote:
> I just went through a kitchen remodel where I had the opportunity to
> pipe in gas. That cost is nothing compared to everything else. I lost
> the argument with you know who. She figured wiping up spills is easier
> on a unitop. Now you can tell which burner I use for the pot. However
> we didn't replace the side-by-side because it is the old model without
> the ice chest. They all come with chilled water which takes up half
> the space. It's the only appliance I'll get repaired. I visited
> someone in the South where they fill their ice maker with bagged iced
> because it couldn't keep up.
>
> Jim

Thanks, Jim. This is all SO helpful. I'm going to wait until I'm in the
house, but now realize that the stove probably won't be lasting long.
Since I have a deep freezer, I can get by longer with the side-by-side,
though I really don't think I want to - between teh ice bin and the
water chiller (it has both in the door) there's barely room for
anything. Time to re-work the budget!

Resa

Hello:

We sell the full-line of Jenaer Glass teaware in our shop and according
to Jenaer, their kettles are designed for use on ceran-top ranges and
gas ranges. That said, we tell our customers to use a metal trivet
just in case!! We have had a couple of customers who had the kettles
crack when using the metal coils that are more common here in North
America. Just a point of interest, Jena is a susidiary of Schott
Glass, the same company who manufactures the glass on the Ceran-top
ranges for most stove manufacturers. Also, if you are interested in
Jena Glassware, be aware that since March 2005, they no longer produce
any home glassware (including teapots etc). There is a large inventory
out there but certain designs are already out of stock and are no
longer produced. Hope this helps!!
Space Cowboy wrote:
> Does the glass Jena flame proof kettle for use on electric range
> required a 'trivet' for the burner or can it sit directly on a ceramic
> top?
>
> Thanks,
> Jim

All I can say is complete any remodeling before moving in. I see why
people buy new houses just to avoid the fuss and bother even if money
isn't an issue. However if you have the space you can buy restaurant
grade standalone refrigerator and freezer which function as
side-by-side. The cost isn't that unreasonable. There are humongous
household grade refrigerators with crispers near 35f and the freezer
located elsewhere. There are times where a glass kettle would be more
desirable for cleaning and determining water temperature. I have
forgotten a boiling stainless steel kettle on the ceramic for a couple
of hours with no damage. It essentially bakes lose any mineral buildup
on the inside of the pot. Not a recommended way of cleaning the
kettle.

Jim

am wrote:
> On 8/2/2005 12:12 PM, Space Cowboy wrote:
> > I just went through a kitchen remodel where I had the opportunity to
> > pipe in gas. That cost is nothing compared to everything else. I lost
> > the argument with you know who. She figured wiping up spills is easier
> > on a unitop. Now you can tell which burner I use for the pot. However
> > we didn't replace the side-by-side because it is the old model without
> > the ice chest. They all come with chilled water which takes up half
> > the space. It's the only appliance I'll get repaired. I visited
> > someone in the South where they fill their ice maker with bagged iced
> > because it couldn't keep up.
> >
> > Jim
>
> Thanks, Jim. This is all SO helpful. I'm going to wait until I'm in the
> house, but now realize that the stove probably won't be lasting long.
> Since I have a deep freezer, I can get by longer with the side-by-side,
> though I really don't think I want to - between teh ice bin and the
> water chiller (it has both in the door) there's barely room for
> anything. Time to re-work the budget!
>
> Resa