The Paragon Caldera is the kiln people find when they ask whether pottery can be fired high without a 240V circuit. Paragon says it operates on 120V household power and fires to 2,350°F (1,288°C), which covers cone 10 on Orton's chart. The trade-off is size: 8 x 8 inches across and 6.75 inches deep.
This review is research-based. We compared Paragon's own Caldera page and warranty policy with dealer listings from Sheffield Pottery, Kiln Frog, Bailey Pottery, Bullseye Glass, The Ceramic Shop, Clay-King and Abrimagery, checked October 2026. We did not fire this kiln. Paragon's page does not print amps, watts or breaker size in its text, so those figures come from dealers, and we name each one.
Verdict
Buy the Caldera if you want a high-fire test kiln, a kiln for beads, pendants and small cups, or a first kiln that needs no new wiring in many homes. It is light, ships by parcel, reaches stoneware and porcelain temperatures and takes add-on collars for glass and enamel.
Skip it if you throw full-size mugs and bowls each week. A load is a handful of small pieces, so a Skutt KM-614-3 on a 20A circuit, or a 240V kiln, will serve a wheel thrower better. If you want more height on 120V, the Caldera XL is the step up, but it wants a 20A breaker.
Paragon Caldera specs
| Item | Caldera, 120V | Caldera with window | Caldera XL, 120V |
|---|---|---|---|
| Power | 120V, 14A, 1,680 W (Sheffield, Kiln Frog) | Same | 120V, 15A, 1,800 W (Sheffield) |
| Breaker and wire | 15A, 14 gauge (Sheffield); 20A (Bullseye) | Same | 20A, 12 gauge (Sheffield) |
| Plug (NEMA) | 5-15 (Kiln Frog, Bullseye) | 5-15 | 5-15 (Sheffield) |
| Max temperature | 2,350°F (1,288°C) (Paragon); cone 10 (Bailey) | About 2,100°F (1,149°C) | 2,350°F (1,288°C) |
| Interior | 8 x 8 x 6.75 in, 0.25 cu ft | Same | 7.5 x 7.5 x 9 in, 0.29 cu ft (Sheffield) |
| Brick | 2.5 in (Paragon) | 2.5 in | 3 in (Sheffield) or 2.5 in (The Ceramic Shop) |
| Controller | Sentinel TouchXpress (Paragon) | Sentinel TouchXpress | Bartlett Genesis Mini (Sheffield) |
| Shipping weight | 46 lb (Sheffield, Bullseye); 50 lb (Kiln Frog) | Not published | 75 lb (Sheffield) |
| Link | Check price | Dealer order | Check price |
- Outside size: 13 in wide, 19.5 in deep, 13.75 in high including stand (Kiln Frog); Abrimagery lists 11.8 in high
- Elements: side elements in dropped, recessed brick grooves (Paragon, Kiln Frog)
- Included: steel stand with mar-proof feet, on/off safety switch, vented switch box (Paragon); shelf sold separately
- Voltages: 120V and 240V single-phase, each with or without a window (Paragon); Clay-King also lists 100V and 208V
- Price band: typically $1,600 to $1,800 in October 2026 at Paragon's store and US dealers; the window version costs more; check the live price
Source conflicts, checked October 2026: Sheffield and Kiln Frog list 14A and 1,680 W; Bailey Pottery and Bullseye Glass list 15A. Sheffield lists a 15A circuit on 14-gauge wire, while Bullseye lists a 20A breaker. Bailey gives the interior as 7.5 x 7.5 inches; Kiln Frog, Bullseye and Abrimagery say 8 x 8. Bullseye's own edition ships with a Sentry Xpress 3-key controller instead of the TouchXpress. Our earlier Paragon pages noted that Paragon's site blocked our page reader; paragonkilns.com loaded this month and confirmed the 2,350°F rating, 2.5 inch brick and TouchXpress, but its electrical figures sit in an image we could not read. Paragon's store showed the Caldera as sold out on the day we checked; it is a current model.
A Caldera draws close to the full rating of a 15A household circuit for hours. Have a licensed electrician check or install the circuit, confirm nothing else shares it, and confirm the breaker against the nameplate on your kiln. Plug it straight into the wall receptacle, not an extension cord or power strip.
What fits inside a Caldera
The chamber is 8 x 8 inches and 6.75 inches deep. Kiln Frog lists a 7 inch square shelf, sold separately. Once you allow for a shelf and an air gap below the lid, a piece about 6 inches tall is the practical ceiling, and a 7 inch square footprint is the limit.
That makes a typical load one of these:
- A dozen or more glaze test tiles, stacked on two levels with short posts.
- Two or three small cups, espresso cups or tea bowls.
- Beads, pendants, buttons and small ornaments.
- A small bowl or dish up to about 7 inches across.
Furniture kits vary by seller. Bailey's kit has one 7 x 7 x 5/8 inch shelf, posts of 1, 3 and 5 inches and 1 lb of kiln wash; Clay-King's has four 1 inch posts, one 7 inch shelf and 1 lb of glass separator. Choose kiln wash for pottery and separator for glass. If your main goal is testing glazes before full firings, our test kiln guide covers how potters use a small kiln that way.
Cone 10 on 120V: what the rating means
Paragon rates the Caldera to 2,350°F (1,288°C). Bailey Pottery states it as cone 10. That leaves plenty of room for cone 04 bisque and cone 5 to 6 glazes, and reaches cone 10 for stoneware and porcelain tests. Our pottery cone chart converts cones to temperatures.
Two limits apply. Firing at the top of any kiln's rating wears its elements faster than firing below it, so a Caldera used mostly for cone 6 will need elements less often than one fired to cone 10 every time. And the 2,350°F rating applies only to the plain lid; the window and collars below lower it.
Collars and the glass window
The Caldera is modular. Its lid and base are interchangeable when no window is fitted, and Paragon sells collars that stack onto the base to add height for glass and enamel work. The collars have no elements, so they lower the top temperature.
- Caldera-BC bead collar: adds 4.5 inches of height and a 7.5 x 2 inch bead door; 2,000°F per Kiln Frog and The Ceramic Shop.
- Caldera-X blank collar: same height, no door; 2,000°F per Kiln Frog, 1,700°F per The Ceramic Shop.
- Caldera-E enameling collar: adds 6.75 inches; 1,500°F per Kiln Frog, 1,800°F per The Ceramic Shop.
- Window lid: rated to 2,300°F itself, it lowers the kiln to about 2,100°F (1,149°C). Kiln Frog says it can be plugged with ceramic fiber for porcelain or stoneware.
For pottery, buy the plain lid. A collar does not turn the Caldera into a taller pottery kiln, because the extra space never reaches cone 6.
Caldera vs Caldera XL
The Caldera XL trades a little width for height: 7.5 x 7.5 inches across and 9 inches deep, 0.29 cubic feet, per Sheffield Pottery. It keeps the 2,350°F rating, draws 15A and 1,800 W, and uses the same 5-15 plug, but Sheffield calls for a 20A breaker and 12-gauge wire. Sheffield lists 3 inch brick and The Ceramic Shop lists 2.5 inch, so ask which you are getting.
Choose the XL if you want to fire a small mug upright or two layers of tiles on a taller shelf and you have a 20A circuit at the kiln spot. Choose the standard Caldera if your only option is an ordinary 15A circuit.
The 240V Caldera
Paragon lists 240V single-phase versions of the Caldera, with or without a window. Neither Paragon's page text nor the dealers we checked publish its amps, watts or plug, so ask the dealer for the nameplate figures before ordering. It mainly suits buyers outside the US or studios that already have a spare 240V circuit.
Controller
Paragon's page lists the Sentinel TouchXpress digital touchscreen controller as standard. It runs cone-fire and ramp-hold programs; our kiln controller guide explains the difference. Some dealer editions ship with the 3-key Sentry Xpress, and Sheffield lists a Genesis Mini upgrade, so check the controller named on the listing you buy.
What a firing costs, worked from the dealer watts
At 1,680 W, the Caldera uses up to 1.68 kWh for each hour its elements run fully on. At an example rate of 15 cents per kWh, that is a ceiling of about 25 cents per hour. The real figure is lower because the controller cycles the elements. Multiply by your own rate and schedule for an upper limit; our kiln cost guide has the wider picture.
Placement and safety
Paragon includes a steel stand with mar-proof feet, and the Caldera should sit on it on a non-combustible surface, with the clearances in Paragon's instruction manual. Kiln Frog notes that the lid must stay hinged to the body for the lid safety switch, and should not open past 90 degrees unless it rests on a heat-proof support.
Even a small kiln gets hot on the outside and gives off fumes. Keep it away from walls, curtains and anything flammable, ventilate the room, and keep children and pets away while it fires. Clean clay and glaze dust wet, because it contains silica, and wear a NIOSH-approved respirator when mixing dry glazes. Follow Paragon's manual or a qualified kiln technician for element replacement.
Warranty
Paragon's limited warranty policy gives 1 year on kilns rated above 2,300°F, which includes the Caldera at 2,350°F. Its Sentinel TouchXpress controller carries 2.5 years. Paragon excludes overfiring, damage beyond the nameplate temperature, reduction or salt firing, improper electrical installation and expendable parts, and coverage applies only to the original buyer.
Where to buy a Caldera
Paragon sells the Caldera direct from paragonkilns.com and through US ceramic and glass dealers. Clay-King lists it as shipped from the factory by UPS or FedEx with an estimated 2 to 3 week lead time, and Bailey Pottery listed it in stock. It was not found on amazon.com in our research, so the button above opens an Amazon search. For other small kilns, see our small kiln picks.
What the Caldera does well
It reaches 2,350°F from a household-type plug, weighs under 50 lb shipped, and arrives by parcel instead of freight. The touchscreen controller and the collar system let one kiln cover pottery tests, beads, glass and enamel. Paragon builds it in Mesquite, Texas, and parts and support run through a wide dealer network.
Weak points
The chamber is tiny, so the cost per piece fired is high for anyone making full-size pots. Brick is 2.5 inch. The electrical figures are dealer data, and dealers disagree on amps, breaker, interior width and weight. The window and collars cut the top temperature, the warranty is 1 year, and Paragon's store showed it as sold out on the day we checked.
Who should buy, and who should skip
Buy the Caldera if you test glazes, make small pieces or jewelry, want a second kiln beside a big one, or need a high-fire kiln without new wiring. Skip it if you throw mugs and bowls weekly, if your only outlet shares a busy 15A circuit, or if you want to fire tall pieces.
Alternatives
- Other Paragon kilns: the Xpress Q-11A front-loader and the full-size TnF models.
- Skutt Firebox: plug-in kilns for cone 6 and glass work.
- Olympic Doll E: another small 120V high-fire kiln.
- Jen-Ken 11/9: a 0.55 cubic foot 120V kiln, up to 2,250°F on its 17A version.
- Best electric kilns: every option sorted by circuit, including the 120V Skutt KM-614-3.
Sources: Paragon Caldera product page and Paragon kiln limited warranty policy (paragonkilns.com); dealer listings from Sheffield Pottery (Caldera and Caldera XL), Kiln Frog, Bailey Pottery, Bullseye Glass, The Ceramic Shop (Caldera and Caldera XL), Clay-King and Abrimagery; Orton cone chart. Specs checked October 2026.