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Straight-on view of opened, square-shaped - with rounded corners - JK-squared glass kiln from Jen-Ken, set on a small metal stand with electrical box on right front corner of kiln outfitted with the Orton AutoFire 4000 12-button controller.

Jen-Ken AFG JK² Glass Kiln

Save $796.00
$3,978.00
$3,182.00
Financing Information i

Financing through Approve is exclusively for business equipment loans and is available to all types of organizations, excluding personal loans. Minimum purchase price of $1,500.

A professional-grade square kiln for glass fusing and slumping. Its large chamber, even heat, and effortless lid lift make it ideal for artists creating large plates, bowls, tiles, or draping projects with precision and consistency.

Important Details:

  • Chamber size: 27” W x 27” D x 11” H
  • Volume: 4.5 cubic feet
  • Maximum temperature: 1700°F
  • Electrical: 240V, 36A, NEMA 6-50 plug
  • Breaker: 40A required

iNot sure what product options to choose? Check out our Kiln FAQs below!

Controller selection
Relay selection
Furniture selection

Need a formal quote or to request a W9? Let us know!

Interested in all Reviews ever provided to Pottery Pulse, regardless of product? Click here.

Jen-Ken AFG JK² Glass Kiln – Professional Square Kiln for Advanced Glass Fusing and Slumping

The Jen-Ken JK² Glass Kiln (also known as the JK Squared) is a powerful, large-format, square kiln built for serious glass artists. With a spacious 27” x 27” x 11” interior, it’s ideal for firing wide plates, tiles, bowls, and draping projects that demand even heat and professional consistency.

Its square body design maximizes usable shelf area, allowing artists to efficiently produce full sets or larger single pieces with minimal wasted space. The top-and-side firing configuration ensures balanced heating throughout every firing cycle, delivering smooth slumps and flawless fuses.

Lid lifters are included, making it effortless to open and close the kiln despite its size. The JK²’s robust build and even heat distribution make it a reliable choice for studios producing medium to large-format glasswork.

The kiln comes standard with the Orton AutoFire 4000 12-Key Controller, providing precise digital control and customizable programming for repeatable results. Artists seeking advanced control can upgrade to:
– Orton AutoFire Slide Touchscreen Controller – intuitive, modern interface for streamlined programming
– TAP II Touchscreen Smart Controller – Wi-Fi connectivity, cloud data storage, and real-time monitoring

An optional furniture kit (26" shelf and ½" posts) offers flexible setup options for multi-level projects, while optional solid-state relays (SSR) provide silent, long-lasting temperature accuracy for heavy studio use.

Key Features

• Best for glass fusing and slumping
• Spacious 27” x 27” x 11” square chamber for large-format glass projects
• Ideal for plates, tiles, bowls, and draping molds
• Top-and-side firing ensures even heat and consistent results
• Lid lifters included for smooth and easy operation
• Optional SSR for quiet, precise, durable performance
• Optional furniture kit for versatile firing setups
• Compatible with touchscreen controller upgrades

What’s Included

• Orton AutoFire 4000 12-Key Controller (standard)
• Lid Lifters
• Kiln Wash
• Kiln Stand
• Instruction Manual
• 2-Year Limited Warranty for Kiln and Controller

  • Model: AFG JK² Glass
  • Inside Chamber Dimensions: 27” W x 27” D x 11” H
  • Cubic Feet: 4.5
  • Overall dimensions (footprint and height): 37" W x 44" D x 17" H
  • Maximum Temperature: 1700°F
  • Elements: Top, Side firing
  • Kiln weight: 250 pounds
  • Volts: 240
  • Amperage: 36A
  • Watts: 8,640
  • Plug configuration: NEMA 6-50
  • Breaker: 40A
  • Circuit wire gauge: 8

Estimated order-to-ship lead time is approximately 6 weeks.

We get it. You've got a lot of choices when it comes to online retailers. Here's why we think you should shop with us at Pottery Pulse.

If this specific product has already been reviewed, you will find it below all the product information tabs, and above the "You may also like..." section.

If it has not, you can still find all reviews left from Pottery Pulse customers at this Reviews page on our site. Please click that link and read what other customers are saying as you consider whether or not to provide your business to Pottery Pulse.

We are confident we sell outstanding products from outstanding manufacturers, and that we'll top the best customer experience you can find anywhere. We are devoted to our customers because we simply are out of business without them.

Simply put, you could say that makes you the center of our universe.

FAQs - Configuring Your Kiln

There are certain selections you must choose. And then there are options you can click on or ignore. The answers below should help you make the best choices for you.

 Which Kiln Voltage Should I Select?

Higher voltage means lower amperage draw and greater efficiency, which can save money long term. 240V and 208V cost the same—most home studios use 240V, while 208V is common in schools or large facilities. Amperage refers to the amount of electrical current a kiln draws—higher amps require heavier wiring and breakers.

What's The Difference Between Single-Phase and Three-Phase?

Single-phase is what almost all homes have. If your facility has three-phase, you can choose either—but three-phase is typically the better long-term option due to smoother power and improved efficiency.

Which Relay Option Do I Need?

Mechanical relays are standard and reliable. Solid-state relays (SSR) offer silent operation, faster cycling, greater precision, and longer lifespan—ideal for frequent or high-accuracy firings.

What Are The Differences Between Kiln Controllers?

The following controllers are used across kilns sold by Pottery Pulse. Not all models offer every option—available controllers are listed on each product page. Some kilns include only the standard controller, while most allow upgrades for added precision and convenience.

Olympic Kilns

  • Infinite Switch – Manual dial control for simple heat adjustments.
  • KilnStar – Digital controller with preset and user-defined programs.
  • Genesis – Advanced touchscreen interface with Wi-Fi and data logging.

Evenheat Kilns

  • Icon – Digital 3-button controller for straightforward firing.
  • RampMaster II – Manual digital controller for ceramic kilns; flexible ramp/hold programming.
  • RampMaster 3 – Updated version for glass kilns with refined interface.
  • Icon+ – Enhanced digital control with expanded profiles and precision.
  • TAP II – Smart touchscreen controller with Wi-Fi, data tracking, and remote access.

Hot Shot Kilns

  • Novus – “Set & Go” controller: set a target temperature and it does the rest (no segments).
  • Spark – Entry-level touchscreen controller with intuitive operation and limited program control.
  • TAP II – Smart touchscreen controller with Wi-Fi and real-time monitoring.

Jen-Ken Kilns

  • Orton AF3P 3-Button – Reliable and straightforward for basic firing.
  • Orton AutoFire 4000 12-Key – Expanded program capacity and fine control.
  • Orton AutoFire Slide Touchscreen – Modern, responsive touchscreen interface.
  • TAP II Touchscreen Smart Controller – Wi-Fi connectivity and real-time data tracking.

What Are Collars For?

Not all kilns can use a collar, but Olympic’s Hot Box kilns can be ordered with a collar to expand versatility. A blank collar simply adds height to the firing chamber, while a bead collar adds the same height and includes a built-in bead or annealing door for quick-access lampwork projects.

What Does The Power Interrupt Switch Do?

This safety feature automatically cuts power to the heating elements whenever the kiln lid or door is opened. It prevents accidental burns, protects elements, and resumes power only when safely closed. (Also called an automatic lid shutoff on Olympic kilns.)
Description

Jen-Ken AFG JK² Glass Kiln – Professional Square Kiln for Advanced Glass Fusing and Slumping

The Jen-Ken JK² Glass Kiln (also known as the JK Squared) is a powerful, large-format, square kiln built for serious glass artists. With a spacious 27” x 27” x 11” interior, it’s ideal for firing wide plates, tiles, bowls, and draping projects that demand even heat and professional consistency.

Its square body design maximizes usable shelf area, allowing artists to efficiently produce full sets or larger single pieces with minimal wasted space. The top-and-side firing configuration ensures balanced heating throughout every firing cycle, delivering smooth slumps and flawless fuses.

Lid lifters are included, making it effortless to open and close the kiln despite its size. The JK²’s robust build and even heat distribution make it a reliable choice for studios producing medium to large-format glasswork.

The kiln comes standard with the Orton AutoFire 4000 12-Key Controller, providing precise digital control and customizable programming for repeatable results. Artists seeking advanced control can upgrade to:
– Orton AutoFire Slide Touchscreen Controller – intuitive, modern interface for streamlined programming
– TAP II Touchscreen Smart Controller – Wi-Fi connectivity, cloud data storage, and real-time monitoring

An optional furniture kit (26" shelf and ½" posts) offers flexible setup options for multi-level projects, while optional solid-state relays (SSR) provide silent, long-lasting temperature accuracy for heavy studio use.

Key Features

• Best for glass fusing and slumping
• Spacious 27” x 27” x 11” square chamber for large-format glass projects
• Ideal for plates, tiles, bowls, and draping molds
• Top-and-side firing ensures even heat and consistent results
• Lid lifters included for smooth and easy operation
• Optional SSR for quiet, precise, durable performance
• Optional furniture kit for versatile firing setups
• Compatible with touchscreen controller upgrades

What’s Included

• Orton AutoFire 4000 12-Key Controller (standard)
• Lid Lifters
• Kiln Wash
• Kiln Stand
• Instruction Manual
• 2-Year Limited Warranty for Kiln and Controller

Specifications
  • Model: AFG JK² Glass
  • Inside Chamber Dimensions: 27” W x 27” D x 11” H
  • Cubic Feet: 4.5
  • Overall dimensions (footprint and height): 37" W x 44" D x 17" H
  • Maximum Temperature: 1700°F
  • Elements: Top, Side firing
  • Kiln weight: 250 pounds
  • Volts: 240
  • Amperage: 36A
  • Watts: 8,640
  • Plug configuration: NEMA 6-50
  • Breaker: 40A
  • Circuit wire gauge: 8
Current lead times

Estimated order-to-ship lead time is approximately 6 weeks.

Why Buy From Us

We get it. You've got a lot of choices when it comes to online retailers. Here's why we think you should shop with us at Pottery Pulse.

Customer Reviews

If this specific product has already been reviewed, you will find it below all the product information tabs, and above the "You may also like..." section.

If it has not, you can still find all reviews left from Pottery Pulse customers at this Reviews page on our site. Please click that link and read what other customers are saying as you consider whether or not to provide your business to Pottery Pulse.

We are confident we sell outstanding products from outstanding manufacturers, and that we'll top the best customer experience you can find anywhere. We are devoted to our customers because we simply are out of business without them.

Simply put, you could say that makes you the center of our universe.