Pottery Kiln vs Glass Kiln: Why Element Placement Decides Everything (2026)
Clay wants heat from the sides and glass wants heat from above. Almost every other difference between the two kinds of kiln follows from that one fact.
Here is the whole difference in one line: clay wants heat from the sides, glass wants heat from above.
Everything else follows from that. The maximum temperature, the lid that opens like a clamshell, the controller with thirty-two ramp segments, the price. Once you see why, the question "can I use one kiln for both?" stops being a yes or no and becomes a much more useful question about which direction you are going.
Every chamber dimension, voltage, amperage, plug, cubic foot figure and temperature on this page is taken from our own product record for the kiln named in that sentence. Where we do not publish a figure, this page says Not published rather than carrying across a number we cannot stand behind. Prices update live from our store.
Quick picks
You can often fuse small glass in a pottery kiln. You almost never can fire clay in a glass kiln, because glass kilns stop well below the temperatures clay needs.
- Best kiln that genuinely does both: the Jen-Ken Ceram-a-Glass 1513, $2,068.00. Two separate element sets, coils in the lid for glass and coils in the walls for ceramics, with a toggle switch to choose. 1,700°F in glass mode, 2,150°F in ceramic mode, 15" x 13" chamber, 1.33 cu ft, 240V at 22A. Two kilns in one box, and you pay for the second set of elements.
- Bigger version of the same idea: the Ceram-a-Glass 1815, $2,080.00. The same two circuits and the same two ceilings in an 18" x 15" chamber, 2.21 cu ft, 240V at 26A.
- Best dedicated glass kiln for a home studio: the Evenheat GTS 17, $2,649.00. A 17" square chamber on a full 16" shelf, 2.26 cu ft, 1800°F, a fiber lid over firebrick walls and floor, and the Quiet Drive solid state relay as standard. 240V at 18A on a NEMA 6-20.
- Cheapest real way into glass: the Evenheat Studio Pro STP, $1,214.00, an 8" x 8" x 4.5" bench-top box, 1800°F, 12 amps on an ordinary NEMA 5-15 outlet. Or the Jen-Ken AF3P 15/6, $1,249.00, 1,700°F, for a wider 15" shelf. Both are 120V. Browse the band: 120V kilns, no electrician needed.
- Best pottery kiln, if clay is the real job: the Olympic 1818HE, $2,422.00, cone 10, 2.63 cu ft, 21 amps at 240V. Or the Cress E1414, $1,867.70, cone 10 in 1.4 cu ft.
- If you only need to anneal beads: you do not need a fusing kiln at all. The Jen-Ken Chilipepper is $1,074.00, plugs into a wall outlet and draws 8 amps. An annealer, not a fuser. Its 1,100°F ceiling is deliberate.
Start hereWhy element placement is the whole story
A pottery load is a three-dimensional stack: pots on a shelf, posts, another shelf, more pots, several layers deep. Heat has to get into the middle of that stack from all around it, so pottery kilns put the elements in grooves cut into the side walls, wrapping the load in radiant heat. Our Olympic 1818HE ships with its coiled elements already seated in the grooves of the brick wall sections, and Olympic sells two-zone and three-zone control as a paid option on top of that, so a controller can even out the top-to-bottom difference in a tall load.
A glass load is the opposite shape: a single flat piece, or a flat stack of two or three layers, lying on one shelf. What matters is that every square inch of that flat surface reaches the same temperature at the same moment. Side elements cannot do that. They heat the perimeter of the piece faster than the centre, and in glass that differential shows up as real defects:
- Uneven fuse. The edges round over and begin to flow while the centre is still stiff, so the piece pulls, distorts or traps bubbles along the seam.
- Thermal shock. Glass is far less tolerant of a temperature gradient across a piece than clay is. Hot edges and a cold centre put the sheet in tension and it cracks, usually on the way up.
- Devitrification on the hot spots. The perimeter sits longer at crystal-forming temperature and goes cloudy or scummy while the middle looks fine.
So glass kilns put the coils in the lid, firing straight down onto the shelf. Radiant heat from directly above hits the whole flat surface at once.
The Ceram-a-Glass 1513 is the clearest proof that this is the real difference, because Jen-Ken solved it the honest way: two complete sets of elements and a switch. Our own product page for that kiln puts it plainly.
A toggle on the control panel selects which set of elements does the work. Up is glass mode: the lid coils fire from above and wash the shelf in even heat, which is what fused and slumped glass needs, with the middle-side coils helping the chamber come up to temperature. Down is ceramic mode: the side coils take over for the side firing that clay and glaze want.
Nobody builds in a second element circuit and a second set of wiring unless the placement genuinely matters.
Element placement is a property of the model, not of the category, so check the kiln rather than assuming. Our record for the Jen-Ken Chilipepper, which is a glass oven, lists it as side-fired, because an annealer never has to fuse anything flat and does not need heat from above. The Paragon F130 is built side-fire, top-fire or top-and-side combination, chosen at order time. Where our record does not state how a kiln is fired, we say so rather than reading it off the product category.
The comparisonSide by side
Everything in the right-hand columns is drawn from the product records of kilns we actually stock, named in the cell. Where we publish no figure, the cell says so.
| Pottery kiln | Glass kiln | |
|---|---|---|
| Elements | In grooves in the side walls. Single zone as standard on the Olympic 1818HE, with two-zone and three-zone control as paid options. | In the lid, firing down onto the shelf. Not universal: the Chilipepper annealer is side-fired and the Paragon F130 is ordered side-fire, top-fire or combination. |
| Max temperature | Cone 6 to cone 10. We publish 2,350°F for cone 10 on the Olympic 1818HE. Cone 6 in Fahrenheit: Not published. | 1,700°F on the AF3P 15/6, the Paragon F130 and the Ceram-a-Glass in glass mode; 1800°F on the Evenheat GTS 17 and Studio Pro STP; 2,000°F on the Paragon SC2. |
| Load shape | Multiple shelves, stacked three-dimensionally. | One flat shelf, one layer. |
| Access | Top-loading lid or front-loading door; deep chamber. | Lid, flip door or vertical-drop door; shallow chamber, easy reach to a flat shelf. |
| Controller | Cone-fire presets plus full ramp and hold programming. The Bartlett KilnStar is standard on the Olympic 1818HE. | Many ramp and hold segments, because glass schedules have several stages. We list the SENTINEL Touch Xpress on the Paragon F130 at up to 32 segments and 12 saved profiles. |
| Relays | Mechanical relays are normal; a solid state relay is a paid upgrade on the Olympic 1818HE. | Often standard, but not always: Evenheat fits Quiet Drive as standard on the GTS 17, while Jen-Ken lists solid state relays as a paid upgrade on the Ceram-a-Glass and the Chilipepper. |
| Lid vent | Peepholes; downdraft vent sold separately. | Two-position lid vent is fitted to the Evenheat GTS 17, for venting and controlled cooling. |
| Insulation | Firebrick. We publish 3 inch brick on the Olympic 1818HE. | Often hybrid: the GTS 17 is a light fiber lid over firebrick walls and floor, so it heats fast but still stores heat for a smooth anneal. The Paragon F130 is 3 inch firebrick throughout. |
The common caseCan you fuse glass in a pottery kiln?
Often yes, within limits, and plenty of people do. The temperature is not the problem. Oceanside publishes a full fuse of 1460°F to 1475°F and a slump of 1225°F to 1250°F for its own sheet glass. Bullseye publishes no full fuse range at all; its platemaking schedule peaks at 1490°F. Our own Chilipepper listing rounds the whole band to roughly 1,450°F to 1,500°F for a full fuse and about 1,200°F for a slump, which is a fair summary rather than a manufacturer figure. Take whichever you like: every one of them sits hundreds of degrees below what any pottery kiln can reach. The published numbers, including the two places Oceanside's own sheet disagrees with itself, are in our glass fusing temperature guide. The problem is not heat. It is uniformity.
What usually works: small pieces, jewelry, coasters, a 4" or 6" tile, on a single primed shelf positioned high in the chamber near the top element band, with ramps slowed down to give the chamber time to even out. Slumping is more forgiving than fusing, because the glass only has to soften, not flow.
What usually does not: anything large and flat. A 12" panel in a side-fired kiln will reliably fuse at its edges before its centre. Tack fusing is the hardest case of all, because the whole effect depends on stopping at a precise point everywhere at once. And fine stringer or frit detail will devitrify at the hot spots.
Three things to do if you try it. Prime or kiln-wash the shelf, because glass will weld itself to bare brick or an unprimed shelf; our Ceram-a-Glass listing makes the same point and Jen-Ken includes kiln wash with that kiln for exactly this reason. Run the shelf on posts so air can circulate under it. And fire a test piece before you commit real glass, because every kiln's hot spots are its own.
If glass is going to be more than an occasional experiment, a dedicated glass kiln pays for itself in pieces you do not throw away. Our best glass fusing kilns guide compares the dedicated models, and the glass fusing temperature guide has the schedules.
The other directionCan you fire clay in a glass kiln?
Usually no, and the reason is ceilings rather than anything subtle.
Bisque is normally cone 06 and a glaze firing is cone 6 or cone 10. We do not publish a Fahrenheit equivalent for cone 06 or cone 6 anywhere in our product data, so this page does not print one: Not published, and our Orton cone chart is the place to look cone equivalents up. What we do publish is ceilings, and the ceilings settle it.
Every glass kiln in our range tops out at 1,700°F or 1800°F, with one exception: the Paragon SC2, $1,476.00, a jewelry and glass kiln rated to 2,000°F. Even 2,150°F, the ceramic mode of the Ceram-a-Glass 1513, is described on its own product page as low-fire and mid-range ceramic territory, and that page tells anyone firing cone 6 stoneware to buy a ceramic kiln instead. A glass kiln sits several hundred degrees below even that, and asking any kiln to run at its absolute ceiling for the last stretch of a firing is how you buy elements.
So if you want to fire pots, buy a pottery kiln. See Ceramic Kilns and our guide to what size kiln you need.
What a glass kiln can do is the ceramic-adjacent work that fires well below those ceilings:
- China paint and overglaze enamels, in the region of cone 022 to cone 018.
- Decals and lustres, roughly cone 019 to cone 011.
- Metal clay and enamelling. The Paragon SC2 is sold as a kiln for glass, metal clay and enamels, which is exactly why the small 120V glass kilns double as jewelry kilns so often.
We publish no firing temperature of our own for any of those processes, so the Fahrenheit figures for them are Not published here as well. Take the cone numbers to the Orton cone chart, then check the result against the ceiling of the kiln you are considering.
Dual mediaThe kilns that really do both
Three honest approaches exist in our catalog, and one to be wary of.
Two element circuits and a switch. The Ceram-a-Glass 1513, $2,068.00, and the 1815, $2,080.00, carry lid coils and wall coils with a toggle between them: 1,700°F in glass mode, 2,150°F in ceramic mode. You are buying two kilns in one box, and you pay for the second set of elements. Note what that ceramic ceiling is not. Jen-Ken publishes no cone rating for the Ceram-a-Glass line, so we do not print one either, and 2,150°F is the honest number to plan against. Our own listing is blunt that it is not a cone 6 stoneware kiln. More on the range in our Jen-Ken kilns guide.
Configurable element placement at order time. Paragon sells lampworking and annealing models in side-fire, top-fire or top-and-side combination builds, chosen when the order goes in. The F130, $3,967.00, an 11" x 13" x 11" chamber at 1700°F on 120V, is the one we are asked about most. That is a choice you make once, not a switch you flip, so be clear about the work before you order.
A lid element added to a pottery kiln. Olympic lists a dual media lid element as an option on the 1818HE, $2,422.00, described on our page as adding a lid element so you can fire ceramics and glass in the same kiln. Whether it can be fitted to a kiln you already own, rather than specified when the kiln is built, is Not published. Ask us before you plan around it and we will get the answer from Olympic.
And the one to be wary of: a side-fired pottery kiln marketed with glass schedules in the controller. Preset programs do not move the elements. If the coils are in the walls, it heats like a pottery kiln no matter what the menu says.
Not sure which direction you are going?
Tell us what you want to make and what is in your breaker panel, and we will tell you whether this is one kiln or two. It is a two minute conversation and it is the cheapest part of the purchase.
ScenariosWhich should you buy
Glass is the main thing, clay is occasional or hypothetical
Buy a dedicated glass kiln. The Evenheat GTS 17, $2,649.00, gives you a 17" square chamber on a full 16" shelf, 2.26 cu ft, 1800°F and a solid state relay as standard, on a 240V 18A circuit with a NEMA 6-20 plug. On 120V, the Studio Pro STP, $1,214.00, or the Jen-Ken AF3P 15/6, $1,249.00, get you started. Browse Glass Kilns and kilns to 1800°F.
Clay is the main thing, glass is occasional
Buy the pottery kiln and fuse small pieces in it on a high shelf, accepting the limits above. The Cress E1414, $1,867.70, or the Olympic 1818HE, $2,422.00, are the usual answers, and both are rated to cone 10. Add a small 120V glass kiln later if the glass habit sticks. Two right-sized kilns beat one compromised one, and you can fire them on different schedules. Our Cress kilns guide covers that range model by model.
You genuinely do both, regularly, and have room for one kiln
The Ceram-a-Glass 1513, $2,068.00, is the kiln built for this. Check the 2,150°F ceramic ceiling against the clay you fire first, and remember there is no published cone rating behind that number.
You are a school or a shared studio
Separate kilns, every time. Different media on different schedules, different students, different cleanup, and a single kiln becomes the bottleneck in the first week. See best kilns for schools and ask about our educational pricing.
You are a lampworker or beadmaker
You do not need a fusing kiln at all. You need an annealer, and they are cheaper. The Jen-Ken Chilipepper is $1,074.00, runs on an ordinary 120V wall outlet at 8 amps, weighs 19 lbs and has a 1,100°F ceiling on purpose. See Glass Annealing Kilns and our annealing guide.
Questions we getFAQ
What is the difference between a pottery kiln and a glass kiln?
Element placement, and then everything that follows from it. Pottery kilns put the elements in the side walls to heat a stacked three-dimensional load and reach cone 6 to cone 10; we publish 2,350°F for cone 10 on the Olympic 1818HE. Glass kilns put the elements in the lid to heat one flat piece evenly from above, and the ones we sell top out at 1,700°F or 1800°F, apart from the 2,000°F Paragon SC2.
Can you fuse glass in a ceramic kiln?
Small pieces, yes, with slower ramps and the shelf set high in the chamber near the top elements. Large flat panels and tack fuses are unreliable, because side elements heat the edges of a flat piece before the centre. Prime the shelf first: glass welds itself to bare brick.
Can you fire pottery in a glass kiln?
Almost never. Bisque is cone 06 and glaze is cone 6 or above, and the glass kilns we sell stop at 1,700°F or 1800°F. You can do china paint, decals, lustres, enamelling and metal clay in one, because those fire well below those ceilings.
Why are glass kiln elements in the lid?
Because glass is fired as a flat sheet on a shelf, and radiant heat from directly above reaches the whole surface at once. As our Ceram-a-Glass page puts it, the lid coils wash the shelf in even heat, which is what fused and slumped glass needs. Side elements heat the perimeter first, which causes uneven fusing, trapped bubbles, devitrification on the hot spots and cracking from thermal shock.
Do glass kilns need a 240V circuit?
Not always. Small glass kilns run on 120V: the Evenheat Studio Pro STP draws 12 amps on a NEMA 5-15 outlet, and the Paragon F130 is 120V single phase. Larger ones need 240V; the Ceram-a-Glass 1513 draws 22 amps and lands on a NEMA 6-30R behind a 30 amp breaker, and the GTS 17 draws 18 amps on a NEMA 6-20 behind a 20 amp breaker. See our kiln electrical requirements guide, and have a licensed electrician size the circuit.
Is a glass kiln cheaper than a pottery kiln?
At the small end, usually yes, because the chamber is shallow and the temperature ceiling is lower. At the studio end they converge, and dedicated lampworking annealers with front-loading doors and rod warmers, like the Paragon F130, run higher than a pottery kiln of the same volume. Compare like for like on chamber size, not on headline price.
Can I convert a pottery kiln into a glass kiln?
Not as a home retrofit: the side elements sit in grooves cast into the brick walls and they do not move into the lid. But do not assume the answer is simply no, because Olympic lists a dual media lid element as an option on the 1818HE, which adds a lid element so the kiln can fire ceramics and glass. Whether that option can be added to a kiln already in your studio is Not published in our records. Call us and we will ask the factory rather than guess.
What about kiln furniture, is it the same?
No. Glass work needs flat shelves that are primed or kiln-washed, plus fiber paper or shelf primer between the glass and the shelf. Pottery shelves and posts are built for stacking weight at high temperature. Browse Kiln Shelves and kiln wash and consumables, or ask us to spec a set with the kiln.
Before you orderStill not sure? Ask us
We are a Georgia kiln dealer, not a marketplace. Tell us what you want to make, whether that is fused panels, pots, beads, jewelry or some of each, and what is in your breaker panel, and we will tell you which kiln fits, including when the answer is two cheap ones instead of one expensive one.
- Expert help before you buy. Real answers on element placement, temperature ceilings and amps from people who sell all of these brands. Contact us or try the kiln finder.
- Flat rate freight with liftgate. Kilns are heavy. Our freight is flat rate and includes liftgate service. See shipping details. There is no sales tax on orders shipped outside Georgia.
- Price match guarantee. Find it cheaper from an authorized dealer and we will match it, see our price match guarantee. Veterans and first responders, check the military and first responder discount before you order.
Browse Glass Kilns, Ceramic Kilns or Glass Annealing Kilns.
Sources. Every chamber dimension, cubic foot figure, voltage, amperage, plug, breaker, cone rating and maximum temperature on this page is taken from our own Shopify product records for the kiln named: the product title and meta title, the "what's included" notes and the specification table on each product page. Checked on 30 October 2026, covering the Jen-Ken Ceram-a-Glass 1513 and 1815, Jen-Ken AF3P 15/6, Jen-Ken Chilipepper, Evenheat GTS 17 and Studio Pro STP, Olympic 1818HE, Cress E1414, Paragon SC2 and Paragon F130. Where a figure is not in those records the page says "Not published" rather than repeating a number from elsewhere: that applies to the Fahrenheit equivalents of cone 06 and cone 6, to the cone rating of the Ceram-a-Glass line, which Jen-Ken does not publish, to firing temperatures for china paint, decals, lustres, metal clay and enamelling, and to whether Olympic's dual media lid element can be retrofitted. The glass fusing and slumping temperatures quoted in "Can you fuse glass in a pottery kiln?" are the manufacturers' own: Oceanside Glass, "Oceanside Glass Firing Schedules, Fahrenheit", and Bullseye Glass, "Tip Sheet 7: Platemaking", both checked 30 October 2026. Prices are our own and update live from our store.
One kiln or two?
Send us your longest piece, your flattest piece and the circuit you have. We will tell you which way to go, including when the right answer costs less than you expected.