Evenheat KO Series Heat Treat Oven

The Evenheat KO Series Heat Treat Oven is a masterpiece of engineering, designed for those who demand the highest levels of performance and precision in heat treatment. With a robust firebrick structure and an impressive maximum temperature of 2400°F, the KO Series stands out in its class. The enhanced insulation and temperature headroom translate into more speed and increased power per cubic foot, perfect for handling high mass loads with ease.

Advanced Design for Optimal Performance

The KO Series redefines convenience and safety with its side-opening doors, ensuring you're not exposed to the intense heat typical of drop-down doors. The forward-facing door latch, always cool to the touch and easily accessible, adds to the overall ergonomic design of these ovens, making your heat treating experience both safe and comfortable.

Customizable Controls for Your Unique Needs

Understanding that precision is key in heat treatment, the KO Series offers control options to cater to your specific requirements. Explore a range of control options to find the perfect fit for your heat-treating needs. Starting in 2025, the Icon controller now comes standard on all Evenheat Heat Treat models. For those seeking advanced functionality, the RampMaster 3 and TAP II controllers are still available as upgrade options. Visit the Controller Options tab to learn more!

Quiet Drive Solid State Relay - Now Standard

Evenheat now equips all knife and heat treat ovens with a standard solid-state design. Check out the Solid State Relay tab to discover why this is big news!

Versatile Size Options to Fit Your Space

With an understanding that every workshop has its unique spatial dynamics, Evenheat offers the KO Series in three different depths: 18", 22.5", and 27". This variety ensures that whatever your space constraints or project size, there's a KO Series oven that will fit perfectly into your workspace.

Specifications:

• Series: KO Series Heat Treat Oven
• Maximum Temperature: 2400°F
• Firebrick Structure: Thicker for enhanced insulation
• Door Design: Side opening for safety and convenience
• Control Options: Icon, RampMaster 3 or TAP II
• Quiet Drive Solid State Relay: n
• Available Sizes: Depths of 18", 22.5", and 27"

Review the all the information tabs on this product page for more detailed information.

Make the Smart Choice with Evenheat's KO Series

Don't settle for less when it comes to heat treating. Choose the Evenheat KO Series for its unparalleled power, precision, and flexibility. With the Evenheat KO Series, you're not just buying an oven; you're investing in a tool that will transform your heat treating process.

This KO 18 heat treat oven delivers optimal results and that's why it is the most popular! It's impeccably sized for knife makers and machinists alike!

Chamber Dimensions

18" Deep x 9" Wide x 5.5" High - 0.52 Cubic Feet

(45.7 cm Deep x 22.9 cm Wide x 14 cm High - 14.7 L)

Outer Dimensions

23.5" Deep x 20" Wide x 19.5" High (includes the 8" stand)

(59.7 cm Deep x 50.8 cm Wide x 49.5 cm High)

Maximum Temperature

2350°F (1288°C)

Electrical

240 Volts, 13 Amps, 3120 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-20

Consult with an electrician for proper fuse panel, service wire size, receptacle, and fusing requirements. It is possible that this model, when used as intended for its expected purpose, may be defined as "continuous use". Continuous use is defined as continuous, full power on for 3+ hours.

Model is available in 200V, 208V, 220V and 230V. If want one of these options, it is by request. After submitting your order - send an email to support@potterypulse.com to ensure this request is not missed.

Model will operate properly on both 50Hz and 60Hz. To say it another way, line frequency has no effect. It doesn't matter. Evenheat recommends that you check your operating voltage before ordering or placing the oven in service.

Model not available in 3 phase Delta or Y designs. KO Series models are produced in a single phase design only. 3 phase designs require the circuit be divided into 3 loads or circuits, as it were. The KF Series models contain 1 heating circuit (albeit comprised of 2 heating elements). So, no-go on that.

Shipping Weight

102lb. (46.4 Kg) - Approx.

Shipping Method

Freight Truck

NRTL Agency Listing
TUV Listed United States and Canada - Designed and Tested to CSA & U/L 499

KO models may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Not too short, not too long. The KO 22.5 offers just the right depth.

Chamber Dimensions

22.5" Deep x 9" Wide x 5.5" High - 0.65 Cubic Feet

(57.2 cm Deep x 22.9 cm Wide x 14 cm High - 18.4 L)

Outer Dimensions

28" Deep x 20" Wide x 19.5" High (includes the 8" stand)

(71.1 cm Deep x 50.8 cm Wide x 49.5 cm High)

Maximum Temperature

2350°F (1288°C)

Electrical

240 Volts, 15 Amps, 3600 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-20

Consult with an electrician for proper fuse panel, service wire size, receptacle, and fusing requirements. It is possible that this model, when used as intended for its expected purpose, may be defined as "continuous use". Continuous use is defined as continuous, full power on for 3+ hours.

Model is available in 200V, 208V, 220V and 230V. If want one of these options, it is by request. After submitting your order - send an email to support@potterypulse.com to ensure this request is not missed.

Model will operate properly on both 50Hz and 60Hz. To say it another way, line frequency has no effect. It doesn't matter. Evenheat recommends that you check your operating voltage before ordering or placing the oven in service.

Model not available in 3 phase Delta or Y designs. KO Series models are produced in a single phase design only. 3 phase designs require the circuit be divided into 3 loads or circuits, as it were. The KF Series models contain 1 heating circuit (albeit comprised of 2 heating elements). So, no-go on that.

Shipping Weight

114lb. (51.8 Kg) - Approx.

Shipping Method

Freight Truck

NRTL Agency Listing
TUV Listed United States and Canada - Designed and Tested to CSA & U/L 499

KO models may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

The KO 27 is the perfect choice for lengthy, heavy-duty projects. Its depth makes it unbeatable for any ambitious task. (Whoa, that's deep.)

Chamber Dimensions

27" Deep x 9" Wide x 5.5" High - 0.77 Cubic Feet

(68.6 cm Deep x 22.9 cm Wide x 14 cm High - 21.8 L)

Outer Dimensions

32.5" Deep x 20" Wide x 19.5" High (includes the 8" stand)

(82.6 cm Deep x 50.8 cm Wide x 49.5 cm High)

Maximum Temperature

2350°F (1288°C)

Electrical

240 Volts, 15 Amps, 3600 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-20

Consult with an electrician for proper fuse panel, service wire size, receptacle, and fusing requirements. It is possible that this model, when used as intended for its expected purpose, may be defined as "continuous use". Continuous use is defined as continuous, full power on for 3+ hours.

Model is available in 200V, 208V, 220V and 230V. If want one of these options, it is by request. After submitting your order - send an email to support@potterypulse.com to ensure this request is not missed.

Model will operate properly on both 50Hz and 60Hz. To say it another way, line frequency has no effect. It doesn't matter. Evenheat recommends that you check your operating voltage before ordering or placing the oven in service.

Model not available in 3 phase Delta or Y designs. KO Series models are produced in a single phase design only. 3 phase designs require the circuit be divided into 3 loads or circuits, as it were. The KF Series models contain 1 heating circuit (albeit comprised of 2 heating elements). So, no-go on that.

Shipping Weight

126lb. (57.3 Kg) - Approx.

Shipping Method

Freight Truck

NRTL Agency Listing
TUV Listed United States and Canada - Designed and Tested to CSA & U/L 499

KO models may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

This list is why the KO Series is the right choice!

High Temperature Heating Elements

The KO Series sports a special Sandvik heating element wire, commonly used for ceramic applications, and usable up to 2400°F (1316°C). Evenheat trusts this wire for all their products: it winds securely, stretches evenly and endures long-term. Just top-notch alloy at work!

Thick, 3" Firebrick Construction

The KO's are built for unparalleled performance, thanks to their 3 inch thick Thermal Ceramics firebrick. That's a full half inch thicker than the standard, making for faster heat-up times and higher temperature potential. Crafted with exclusive Georgia-born materials and made with expertise in the USA, these firebricks are—without a doubt—the best around.

Side Opening Door

The KO models' doors swing open a full 180°, positioning the ultra-hot door away from you so you can focus on your tasks. This ingenious design feature keeps you safe and makes heat treating much easier. You can efficiently remove very hot materials from the chamber to quench them- all while keeping yourself far from danger. This brilliant design is a game-changer!

Relay Access Port

Say goodbye to tedious control panel removal and internal wiring worries! All KO models come equipped with a Relay Access Port, giving you quick and easy access to the relay with only a screwdriver, no panel-off required! Why is this needed when the oven now comes standard with the solid-state design, expected to last the life of the kiln? That is a very logical question.

Well, solid-state units are actually equipped with a mechanical relay that serves as a vital safety component.

This intelligent design addresses the unique behavior of solid-state systems, which are never fully on or off and can produce a slight, almost undetectable leakage current to the elements. The mechanical relay eliminates this issue by physically interrupting the circuit, ensuring complete isolation and zero leakage. It operates only twice per firing cycle: once at the start to initiate current flow and once at the end to shut it off entirely. Built for long-term reliability, the safety relay rarely requires replacement, and the accessible Relay Access Port simplifies maintenance if ever needed. This is engineering excellence in action!

Side-only Element Design

Using a design inspired by culinary bladesmiths, the KO Series eliminates the rear wall heating element and offers superb air flow so all parts of the chamber can be used. Get incredible front to back temperature distribution with no effect on positioning in the chamber. This groundbreaking design sets the new standard in heat treating ovens!!

Cool Touch Handle

The revolutionary handle/latch on the swing-out door is located at the front for added convenience. This spring-loaded, phenolic handle is cool to the touch and designed to be operated with one hand for maximum convenience. As an added bonus, it also functions as the door latch! Evenheat has a lot to thank their loyal customers for, as the innovative design was shaped by their valuable feedback, making operation smoother than ever!

Swing View Control Enclosure

The Swing View Adjustable Enclosure fits all temperature controls on the Evenheat KO Series Heat Treating Oven - except for the Set-Pro. So easy to use, you can pivot the control to a comfortable viewing angle, program the oven and - with one beautiful swing - restore the enclosure to its original position. Perfectly aligned with the TAP touchscreen control, you'll love the convenience of the swing view!

Power Interrupt Switch

This optional power interrupt switch adds a layer of safety to the Evenheat KO Series Heat Treating Oven, suspending power from all heating elements when the door is opened and turning it back on with it is closed. It is a true safety switch, purposely designed to protect the user, and those who plan on entering the oven during use should consider adding it.

Door Shield

The KO oven comes equipped with a door shield, designed to guard against firebrick wear and tear while providing a cooler surface at the door and handle.

2400°F (1316°C) Maximum Temperature

The KO models can reach a sizzling 2400°F (1316°C)! So, no matter what type of steel you're working with - even some that don't exist yet - you'll be able to make the most of your heat treating needs!

Strong Stand and Tool Rest

The improved stands of the KO's now include a tool rest - way to go!

Loud Alarm Kit

Upgrade with this deafening option. Are you tired of missing critical temperature cues in your busy workshop? Say goodbye to those frustrating moments and revolutionize your control system with this game-changing Loud Alarm Kit option. The KO models come standard-equipped with a feature that sets it apart from the competition: a Loud Alarm Output Jack. This cutting-edge technology is designed to elevate your control experience, ensuring you never miss a beat when it comes to reaching the perfect temperature and executing timely quenching. With the Loud Alarm Kit, you'll enjoy a booming 80db of piercing alarm sound that demands your attention. No more straining to hear or missing those crucial cues.

Experience the superior operation of Evenheat's Quiet Drive Solid State Relay System, featuring a tightly controlled heating element for optimal performance that's designed to last.

What is a relay?

Solid state relays (SSR) provide a powerful, reliable alternative to the traditional mechanical relays which contain metal contacts that open and close with an electrically arcing magnet coil. Unlike their mechanical counterparts, SSRs contain a single, solid block of semiconductor material with no moving parts or arcing. For kilns, SSRs offer superior temperature control and numerous advantages over their mechanical counterparts.

Advantage 1 - Eternal Life (you get the idea)

The durability advantage of SSRs is clear; with no moving parts and no arcing, they have a much longer life expectancy than mechanical relays. If you've ever heard the clicking sound of a kiln or furnace during use, that's the sound of its mechanical relays operating. With repeated cycles of on/off, these relays experience considerable wear over time, eventually failing and leaving you with a costly repair. But, with Evenheat's SSRs, you can expect silent, reliable operation throughout the lifetime of your kiln or oven!

Advantage 2 - Keep it tight! (The temperature, that is)

With mechanical relays, the balancing act between good control and relay life creates a limit of no more than one cycle per 10 to 14 seconds. This allows for good control, but for really tight temperature control, this time must be shortened. On the other hand, a solid state relay operates at an incredible 120 times per second. This provides a great opportunity for the control to make even faster decisions, resulting in precise temperature control. All of Evenheat's controls, except for the Set-Pro, are designed to utilize the speed of a solid state relay.

Advantage 3 - Longer Heating Element Life

The solid state relays used in the Evenheat KO Series Heat Treating Oven are designed with Zero Crossing, which means they turn on and off at exact 0V when the AC power line voltage fluctuates. This extends the lifespan of heating elements, which should last significantly longer than those powered by mechanical relays that lack this feature. With Zero Crossing, the heating elements experience the love of being powered on and off at the correct voltage. Zero Crossing is the perfect match for heating elements!

Better by Design - 30 Amp Rated

Evenheat made sure to choose reliable solid state relays that are rated for 30 amps while running them at only 15 amps. This gives them the extra headroom they need to ensure that the system will work well and continue to work well over time. Plus, running the SSRs at half of their full capacity means they remain cool under a 15 amp load, staying completely within the derating curve for proper operation. This way, Evenheat can guarantee their SSRs will last the life of the unit.

Better by Design - SSR Heatsinks Externally Mounted

Efficient SSR performance requires proper cooling, which Evenheat ensures by mounting its SSR heatsinks externally to let air pass freely. To avoid heat build-up, they don't place these sinks within the control enclosure. Further, mounting the SSR heatsinks internally would lead to premature failure of the components and reduce their life-cycle. Evenheat solves these issues by placing these heatsinks on standoffs that allow a gap between the control enclosure and SSR. This gap increases air flow, as well as preventing heat transfer between the two, for ultimate SSR operation - confirmed by a 6 year zero failure record!

Better by Design

There are now 3 controller options available on all Evenheat Knife / Heat Treat Ovens.

The now standard controller is the Icon, based on Bartlett's Spark control platform.

TAP II

The Evenheat TAP II is a top-of-the-line temperature controller that is so intuitive, so powerful, and so user-friendly that you will be blown away! With just one touch, you can access your heat treat programs, which are displayed in easy-to-read text. Then, the TAP II will walk you through creating and refining your programs until they are exactly what you need. You can save as many programs as you want, and you don't have to worry about losing them. What's more, the TAP II is designed to be incredibly consistent and accurate, and when paired with the Quiet Drive Solid State output, you can count on top-notch performance! If that weren't enough, you can also easily access the app for the TAP II, available on iOS and Android, through its Wi-Fi or Ethernet ports. Simply amazing!

Rampmaster 3

The Rampmaster 3 is the gold standard in heat treating ovens and comes complete with a four-digit display, twelve program slots to store your preferred heat treat programs, a numbered keypad, and a program review key. Best of all, it's compatible with the revolutionary Quiet Drive Solid State Relay System for even greater control and convenience.

Estimated order to ship lead time is approximately 4 to 6 weeks.

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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.

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.

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.)