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Electric kiln vs microwave kiln: what each can actually fire

A microwave kiln fuses a glass pendant in minutes. An electric kiln fires pottery. They are not two sizes of the same tool.

Updated November 2026 · 7 min read

Fused-glass pieces laid out on the floor of a small kiln
Photo: Jellaluna, CC BY 2.0, via Flickr
The short version
  • Electric kiln vs microwave kiln: a microwave kiln is a small ceramic-fiber box that heats inside your microwave. It is made for fused glass jewelry such as pendants and earrings. It is not a pottery kiln.
  • Microwave kiln listings in our catalogue give interiors as small as 3.15 x 1.77" and fusing times of 6–8 minutes, with no temperature readout or cone control.
  • A small electric kiln has a controller, a thermocouple and a listed max temperature. The Paragon Xpress Q11A lists 2350 °F, past Orton cone 10, and the E12A lists 2000 °F for bisque and low fire.
  • If you want to fire mugs or bowls, you need an electric kiln (or a studio's). If you want glass jewelry, a microwave kiln is a cheap, fast way to try it.

Electric kiln vs microwave kiln is a common search from people who want to fire their own work without a big setup. Microwave kilns look like a shortcut. They are small, they use a microwave you already own, and a firing takes minutes. But they do a different job.

A microwave kiln is a lidded box of ceramic fiber lined with a material that absorbs microwave energy and gets hot. It is designed to fuse small pieces of glass. An electric kiln uses resistance elements, a thermocouple and a controller to follow a firing schedule for hours, the way pottery needs. This explainer compares the two neutrally, shows picks for each and explains why, for clay, only one of them is the right tool.

Electric kiln

Programmable heat, measured by cone; fires bisque, glaze, glass and metal clay

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vs

Microwave kiln

Ceramic-fiber box heated in a home microwave; fuses small glass pieces

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Picks from each side

Electric kiln

Microwave kiln

Electric kiln vs microwave kiln at a glance

Two very different tools

Small electric kilnMicrowave kiln
Heat sourceElectric elements, own circuitYour home microwave
Temperature control✓ Controller + thermocouple✗ Time and microwave power only
Firing schedule✓ Ramps and holds over hours✗ Minutes; listed 6–8 min to fuse glass
Max temperature listed✓ e.g. 2000 °F (E12A), 2350 °F (Q11A)✗ Not listed
Measured by cone✓ Yes✗ No
Interior (examples)8.5 x 12 x 6.75" (E12A); 6 x 6 x 6.25" (Q11A)4.9" platform (WICAND); 3.15 x 1.77" (MUCOFEI)
Fused glass jewelry✓ Yes (glass kilns, Firebox)✓ Main purpose
Bisque and glaze pottery✓ Yes, to the kiln's rated cone✗ Not a pottery kiln
Metal clay✓ With suitable controller (Firebox lists PMC)✗ Not designed for it
Electrical work~ Dedicated circuit often needed✓ None
Ventilation✓ Required per maker~ Follow kit instructions

Source: Manufacturer listing data, Clay at Home catalogue

Why a microwave kiln cannot replace a pottery kiln

Pottery needs controlled heat over time. A bisque firing usually goes to around cone 06–04, which Orton puts at 1828–1945 °F at 108 °F/hr. Mid-fire glaze goes to cone 5–6, 2167–2232 °F. Cones measure heat work, temperature over time, so a fast spike does not give the same result as a proper schedule. Clay also needs a slow early stage to drive out water without cracking or bursting.

A microwave kiln has none of that. Its listings give no maximum temperature and no way to read or hold one. You control it with the microwave's power and a timer. That works for glass, which fuses quickly at a visible point, and poorly for clay.

What the WICAND listing says about potteryWICAND says its microwave kiln was "customer-tested with low-fire earthenware clay and low-fire glaze" and is "not for high-fire stoneware or large pieces". Treat that as a tiny-piece experiment at most. Without temperature measurement you cannot confirm a glaze reached its cone, so nothing from a microwave kiln should be treated as functional or food-safe.

Listed usable interior height

Inches. Height limits what you can fire: microwave kilns take flat pieces only.

Paragon Xpress E12AParagon Xpress E12A: 6.8"6.8"Paragon Xpress Q11AParagon Xpress Q11A: 6.3"6.3"Skutt Firebox 8x8x4.5Skutt Firebox 8x8x4.5: 4.5"4.5"Tujoe microwave kilnTujoe microwave kiln: 1.8"1.8"MUCOFEI microwave kilnMUCOFEI microwave kiln: 1.8"1.8"
Source: Clay at Home catalogue (manufacturer listings)

What a microwave kiln is good at

For glass jewelry, microwave kilns are a fun and low-commitment start. WICAND lists a 4.9" fusing platform, an outer size of about 7.5" x 3.3", 6–8 minute fusing and a microwave of at least 800 W (1000 W or more for its kit). Tujoe and Crabcut list a 5.31 x 1.77" interior with 50 kiln papers. MUCOFEI's smaller unit has a 3.15 x 1.77" interior for rings, beads and pendants. Fuseworks, from Diamond Tech, sells a microwave fusing kit in its glass line.

  1. Use fusing glass

    Buy glass with a matching COE (coefficient of expansion). WICAND's kit includes COE90 glass. Mixing COEs can crack pieces as they cool.

  2. Protect the base

    Put kiln paper under the glass so it does not stick to the kiln floor.

  3. Follow the kit's time and power

    Start at the listed time and watch through the vent. Use heat-resistant gloves, and set the hot kiln on a heatproof surface.

  4. Let it cool closed

    Opening too soon can shock the glass. Follow the kit's cooling time.

Keep a microwave kiln's microwave for crafts, and follow the kit maker's safety instructions.

What a small electric kiln is good at

A small 120 V electric kiln covers pottery, glass and metal clay, depending on its rating. In our catalogue, the Paragon Xpress E12A lists 120 V, 15 A, 2000 °F and an 8.5 x 12 x 6.75" interior. That suits bisque and low-fire glaze, not cone 5–6. The Xpress Q11A lists 12 A and 2350 °F, enough for cone 10 on paper, but in a 6 x 6 x 6.25" chamber for test tiles and small pieces. Skutt's Firebox 8x8x4.5 LT has a digital ramp/hold controller listed for glass, PMC and ceramics.

The trade-off is electrical. A 15 A kiln needs 18.75 A of circuit under the NEC's 125% continuous-load rule, so a dedicated 20 A circuit. Check yours with the outlet checker and read 120V vs 240V kilns.

Have a licensed electrician confirmKiln makers publish breaker, wire and receptacle requirements per model. Have a licensed electrician check your circuit before the first firing. Do not use extension cords or adapters.Source: Skutt kiln installation

A third category: jewelry and melting furnaces

Many budget "electric kilns" are really small furnaces for metal melting, metal clay and annealing. VEVOR's 1650 W unit lists 2192 °F, and PeiXWming's 2000 W unit lists 2102 °F. Orton puts cone 6 at 2232 °F at 108 °F/hr, so neither can fire cone 6 stoneware. They can be useful for jewelry, but they are not pottery kilns. More in best 120V kilns (and what budget furnaces can't do).

Mistakes to avoid

  • Buying a microwave kiln to fire mugs. It cannot control or confirm cone, and its interior is under 2" tall in several listings.
  • Assuming any "kiln" reaches cone 6. Check the listed max against Orton's chart. Our cone chart has every value.
  • Firing greenware fast. Water and trapped air make clay burst. Electric kilns let you ramp slowly; microwaves do not.
  • Ignoring fumes. Kilns of every kind give off fumes. Ventilate per the maker's instructions.
  • Forgetting the studio-firing route. Many community studios fire members' work. See do you need a kiln?

Other options worth a look

These accessories and alternatives from other brands help on either path. PMC's OV-1 is a tiny electric kiln with a 14-program controller for metal clay. Thompson Enamel's kit pairs a tabletop furnace with enamel supplies for enameling on metal. Bullseye ThinFire is a kiln paper for glass fusing in electric kilns. Orton cones confirm what an electric firing actually reached.

See the full kilns category, best microwave kilns and best glass fusing kilns. Working in an apartment? Start at the small space hub.

How we compared

We compared manufacturer listings for the kilns in our catalogue, Orton's cone chart and kiln-maker install guidance. We did not fire any kiln. Where a listing gives no temperature, we say so.

VerdictChoose an electric kiln if you want to fire pottery, meaning bisque and glaze to a known cone, or want one kiln for clay, glass and metal clay. Match its listed max temperature to your clay (2000 °F for low fire, past 2232 °F for cone 6) and have the circuit checked by an electrician. Choose a microwave kiln if you want to try fused glass jewelry quickly and cheaply, with no wiring: pendants, earrings and small flat pieces, fused in minutes in a home microwave.
Kiln firing cost calculatorEstimate what a kiln firing costs from kiln kW, firing hours and duty cycle, using EIA average residential…Can I plug in my kiln? Outlet checkerCheck a kiln’s amps or watts against a 15, 20, 30, 40 or 50 A circuit using the 80% continuous-load rule,…Orton cone temperature chartOrton self-supporting cone temperatures for cones 022 to 10 at slow, medium and fast heating rates, in °F…

Questions

Can a microwave kiln fire pottery?
Not in any reliable way. In the electric kiln vs microwave kiln comparison, microwave kilns are made for fused glass and small jewelry. They have no temperature control or cone measurement, and interiors as low as 1.77".
How hot does a microwave kiln get?
The listings in our catalogue do not state a maximum temperature. They give fusing times (6–8 minutes for WICAND) and recommended microwave power.
Can you use a kitchen microwave for a microwave kiln?
Kit makers say the kilns fit standard home microwaves. Many crafters keep a separate microwave for crafts. Follow the kit's safety instructions.
What is the smallest kiln that can fire stoneware?
In our catalogue, the Paragon Xpress Q11A lists 2350 °F, past Orton cone 6 (2232 °F) and cone 10 (2345 °F), with a 6 x 6 x 6.25" interior. Confirm the rated cone with the maker.
Do electric kilns need special wiring?
Usually a dedicated circuit. A 15 A kiln needs a 20 A circuit under the 125% rule, and larger kilns need 240 V. Have a licensed electrician confirm.
Can I fuse glass in an electric pottery kiln?
Many electric kilns can fire glass with the right schedule. Skutt's Firebox controller is listed for glass, PMC and ceramics. Use kiln paper or shelf primer under the glass.

Sources

  1. Orton: Pyrometric cones
  2. Skutt: Kiln installation
  3. Seattle Pottery Supply: For the installing electrician