Jen-Ken Oval 13 Glass Kiln

Affectionately known as the “bathtub kiln,” the Jen-Ken Oval 13 is a powerhouse designed for artists and studios that need serious capacity. Its expansive 39″ × 24″ × 18″ chamber easily handles two 20″ plates, a large sink mold, or multiple smaller projects at once. Ideal for glass fusing and slumping, this kiln combines size, reliability, and durability, making it perfect for studio classrooms or mid-range production work. Its sturdy brick construction ensures excellent heat retention and flawless annealing, while the included lid lifters make operation smooth and effortless.

Controller Options

The kiln comes standard with the Orton AutoFire 4000 12-Key Controller, offering precise digital control for consistent results. For an upgraded firing experience, two touchscreen options are also available:

• Orton AutoFire Slide Touchscreen – modern, easy-to-use interface with intuitive programming.

• TAP II Touchscreen Smart Controller – full-featured connectivity with Wi-Fi access, mobile app integration, and firing data tracking.

Optional Add-Ons

Add an SSR (Solid State Relay) for quieter, more efficient temperature control, or include a Furniture Kit for flexible shelf arrangements and multi-level firings. An optional viewing window is also available for visual monitoring during firing.

What’s Included

• Orton AutoFire 4000 12-Key Controller (standard)

• Kiln Stand

• Lid Lifters

• Instruction Manual

• 2-Year Limited Warranty (on kiln and controller)

Beloved by glass artists and educators alike, the Oval 13 delivers dependable performance, generous space, and rugged build quality — a true studio workhorse that earns its nickname with every firing.

• Model: Oval 13" Glass
  
• Inside Chamber Dimensions: 39” W x 24” D x 13” H
• Cubic Feet: 7.2
• Maximum Temperature: 1700°F
• Elements: Top, Side firing
• Kiln weight: 300 pounds
  
• Volts: 240
• Amperage: 45A
  
• Watts: 10,800
  
• Plug configuration: NEMA 6-50
• Breaker: 60A
• Circuit wire gauge: 6

The furniture kit option includes:

• (2) layers of shelves: (2) ″D″ shaped shelves
• (4) 1-inch posts
• 1 pound of kiln wash

Jen-Ken's current production timeline is about 6 to 8 weeks.

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Choose the voltage that matches the electrical service where the kiln will be installed. Some kilns are available in only one voltage, while others can be ordered in multiple voltages. If both 120V and 240V are available, 240V is generally the preferred choice because it places less demand on your electrical system, while 120V offers the convenience of operating on a dedicated standard household circuit. If both 208V and 240V are available, select the voltage that matches your building's electrical service—240V is most common in homes, while 208V is common in many commercial, educational, and institutional buildings. If you're unsure which voltage you have, confirm it with your electrician before ordering.

Your kiln must be built to match the electrical service where it will be installed. Choose single-phase if that's what your building has (almost all homes do). Choose three-phase only if your building has three-phase power available. If both are available, three-phase is generally the preferred option. If you're unsure, verify the available electrical service with your electrician before placing your order.

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.

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.

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.

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.)