Evenheat KH Series Heat Treat Oven

Designed specifically for the North American heat treater without access to 240V, the Evenheat KH Series Heat Treating Oven is a game-changer in metalworking efficiency. Drawing inspiration from Evenheat's highly acclaimed KF and LB models, the KH Series, particularly the KH 418 model, boasts a side-element-only design that epitomizes durability and reliability.

Exceptional Heat Treatment for Superior Results

Achieve unparalleled heat treatment with the KH models' ability to reach temperatures up to 2200°F. This remarkable capability makes the KH Series an ideal choice for knife makers and metal workers, catering to the heat treatment needs of the vast majority of steels used in these crafts. Whether you're forging a custom knife or working on a unique metal piece, the KH Series ensures consistent, high-quality results.

Customizable Controls for Precision and Efficiency

The KH Series doesn't just stop at high temperatures; it offers a range of control options to suit your specific needs. Choose from various control choices to find the perfect fit for your project. Now standard on all Evenheat Heat Treat models is the Icon controller, first introduced in late 2023/early 2024, and based on Bartlett's Spark controller platform. The RampMaster 3 and TAP II controllers remain as upgrade options. See the Controller Options tab for more information.

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 such a game-changer!

Versatile Options to Match Your Workspace

Evenheat understands that every workspace is different. That's why they offer the KH models in two depth options: 13.5" and 18". These choices ensure that regardless of your shop size or project demands, there's a KH model that fits perfectly into your work environment.

Specifications:

• Models: KH Series, including KH 418 with side-element-only design
• Voltage: 120V, tailored for North American standards
• Temperature Capability: Up to 2200°F
• Control Options: Icon, RampMaster 3 or TAP II,
• Quiet Drive Solid State Relay - now standard
• Sizes Available: 13.5" depth and 18" depth

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

Invest in an Evenheat KH Series Oven Today!

Don't compromise on quality and efficiency. Choose the Evenheat KH Series Heat Treating Oven for your metalworking needs and experience the difference in precision, control, and results. Elevate your metalworking craft with Evenheat – where innovation meets craftsmanship.

The KH 414 provides a depth of 13.5 inches. Its minimal footprint is particularly beneficial in workshops where space is limited. Due to its reduced size, the KH 414 features a unique wrap-around heating element and does not include a heating element on the back wall.

Chamber Dimensions

13.5" Deep x 6.5" Wide x 4.25" High - 0.22 Cubic Feet

(34.4 cm Deep x 16.5 cm Wide x 10.8 cm High - 6.2 L)

Outer Dimensions

19" Deep x 16.5" Wide x 17.25" High

(47 cm Deep x 41.9 cm Wide x 43.8 cm High)

Maximum Temperature

2200°F (1205°C)

Electrical

120 Volts, 13 Amps, 1560 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 5-15

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.

KH Series models are designed specifically for the North American standard voltage of 120V. Default production for KH Series models is 120V.

Evenheat will build KH Series models in 100V by request.

After submitting your order - send an email to support@potterypulse.com to ensure this request is not missed.

KH Series models are not available in 240V designs.

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 Wye (380V, 400V, 415V) designs.

KH Series models are produced in a single phase design only.

Shipping Weight

70lb. (32 Kg) - Approx.

Shipping Method

Freight Truck

NRTL Agency Listing

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

California Prop 65

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

Its performance reaches exceptional levels, especially when equipped with the Quiet Drive Solid State Relay option. Similar to the 240V LB models, the KH 418 features a design with heating elements exclusively on the sides.

Chamber Dimensions

18" Deep x 6.5" Wide x 4.25" High - 0.29 Cubic Feet

(45.7 cm Deep x 16.5 cm Wide x 10.8 cm High - 8.2 L)

Outer Dimensions

23.5" Deep x 16.5" Wide x 17.25" High

(59.7 cm Deep x 41.9 cm Wide x 43.8 cm High)

Maximum Temperature

2200°F (1205°C)

Electrical

120 Volts, 13 Amps, 1560 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 5-15

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.

KH Series models are designed specifically for the North American standard voltage of 120V. Default production for KH Series models is 120V.

Evenheat will build KH Series models in 100V by request.

After submitting your order - send an email to support@potterypulse.com to ensure this request is not missed.

KH Series models are not available in 240V designs.

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 Wye (380V, 400V, 415V) designs.

KH Series models are produced in a single phase design only.

Shipping Weight

75lb. (34 Kg) - Approx.

Shipping Method

Freight Truck

NRTL Agency Listing

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

California Prop 65

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

120V North American Operation

The KH Series heat treat ovens are tailored specifically for North American users who only have access to 120V, aligning with the standard household voltage in North America.

While these models efficiently achieve the desired temperatures, it's important to note that they take approximately twice as long to heat up compared to their 240V counterparts. Typically, they can reach 1650°F in around 1.5 hours.

Side Opening Door

Heat treating involves the extraction of extremely hot materials from the chamber for quenching. In this process, everything inside the chamber, including the door, becomes very hot. The doors on the KH models are designed to swing outwards and to the side. This design ensures that the intensely heated door is positioned far from you, allowing you to focus safely on the task at hand.

Cool Touch Handle

The handle/latch on the swing-out door is strategically placed at the front, not obscured on the side. This handle, made of phenolic material, remains cool to the touch. It's designed for one-handed operation and also functions as the door latch, providing convenience and ease of use.

Relay Access Port

Evenheat's Heat Treat oven design showcases exceptional ingenuity, particularly with the standard inclusion of the Quiet Drive Solid State relay.

What sets this system apart is the integration of a mechanical relay as a safety feature within the solid-state design. Unlike traditional systems, solid-state units are never fully "on" or "off," which can result in a small leakage current without intervention. The mechanical relay addresses this by completely interrupting the circuit, effectively eliminating any potential leakage.

The mechanical relay activates only twice per firing cycle: at the start to enable current flow to the solid-state system and at the end to fully cut off the current. Although replacing the safety relay is a rare necessity, the Relay Access Port ensures any maintenance is straightforward and hassle-free.

That’s intelligent engineering at its finest!

Door Shield

The KH models are equipped with a door shield that serves dual purposes: it safeguards against damage to the firebrick and also helps in lowering the temperature at the door and handle, enhancing protection and safety.

Swing View Equipped

Evenheat's TAP II and RampMaster 3 temperature controls are integrated into its innovative Swing View Adjustable Enclosure.

This feature comprises a pivotable, swing-up enclosure that enables you to adjust the control to an angle that's comfortable for both viewing and programming. After adjusting, you can simply lay it back down for easy visibility from anywhere in your shop. The process is straightforward and user-friendly.

The Swing View is particularly compatible with touchscreen controls like the TAP II, as it allows for the perfect alignment of the viewing angle. This feature is sure to enhance your user experience.

Loud Alarm Output Jack

The unit comes equipped with a Loud Alarm output jack, allowing for the connection of Evenheat's optional Loud Alarm. This feature delivers an 80db level of attention-grabbing sound, ensuring that you'll never miss a quenching opportunity again. Enjoy the peace of mind that comes with this powerful auditory alert.

2200°F (1205°C) Maximum Temperature

The maximum usable temperature for the KH models is 2200°F (1205°C). This maximum is well within the range for the vast majority of steels used by knife makers and machine shops.

Evenheat's KH 418 model features a side-element-only design borrowed from its LB Series models.

Maximum temperature is limited by the heating element wire used. Evenheat uses a Sandvik Nickel-Chrome alloy wire for all KH model heating elements. This alloy has proven to last, it tends to stay put and generally plays very nice when used at temps below 2200°F.

Maintenance Parts Tag

To make the replacement of worn items more straightforward, Evenheat has added a maintenance parts tag that lists the appropriate Evenheat part numbers for items likely to require maintenance. This feature is designed to simplify your maintenance process. Isn't this something you wish you had access to long ago?

Strong Stand and Tool Rest

Stands are strong and include a tool rest.Cool!

Power Interrupt Switch - Equipped

The Power Interrupt Switch is designed to enhance safety by automatically cutting off power to all heating elements when the door is opened, and then restoring power when the door is closed.

The switch deployed for this feature is a dedicated safety switch, crafted specifically for such critical applications. This safety switch is robustly designed to forcibly separate and open any contacts that may become welded or stuck together, ensuring genuine safety and reliability.

Every KH model is now standard equipped with the Quiet Drive Solid State Relay feature.

Evenheat confidently anticipates that its solid state relay will endure for the entire lifespan of your unit. It's a feature you'll definitely want to consider! Continue reading to fully understand why.

What exactly is a relay?

Solid state relays (SSRs) offer a robust and reliable alternative to traditional mechanical relays, which use metal contacts opening and closing via an electrically arcing magnet coil. SSRs, in contrast, consist of a solid semiconductor block, eliminating moving parts and electrical arcing. For kilns, SSRs provide superior temperature control and several benefits over mechanical relays.

Advantage 1 - Longevity

The lack of moving parts and absence of arcing in SSRs translates to a significantly longer lifespan compared to mechanical relays. The familiar clicking noise from a kiln or furnace is the sound of its mechanical relays at work. These relays wear out over time due to continuous on/off cycling, leading to expensive repairs. However, Evenheat's SSRs promise silent, dependable operation throughout the life of your kiln or oven.

Advantage 2 - Precise Temperature Control

Mechanical relays are limited to a cycle no shorter than 10 to 14 seconds for balancing control and relay life, which is adequate for good control but not ideal for extremely tight temperature control. SSRs, however, operate at an astounding rate of 120 times per second, allowing for much quicker adjustments and thus more precise temperature control. All of Evenheat's controls are designed to utilize the speed of an SSR.

Advantage 3 - Enhanced Heating Element Durability

Evenheat's KH Series Heat Treating Oven uses SSRs with Zero Crossing technology, which switches on and off at exactly 0V during AC power line fluctuations. This feature significantly prolongs the life of heating elements compared to those powered by mechanical relays without this technology. Zero Crossing ensures that heating elements are powered at the correct voltage, optimizing their lifespan.

Design Excellence - 30 Amp Rating

Evenheat chose high-quality SSRs rated for 30 amps but operates them at just 15 amps, providing a safety margin to ensure longevity and reliable performance. Running SSRs at half their capacity keeps them cool even under a 15 amp load, well within their derating curve for optimal functioning. This design choice ensures the longevity of Evenheat's SSRs for the lifespan of the unit.

Design Excellence - Externally Mounted SSR Heatsinks

Efficient cooling is crucial for SSR performance, and Evenheat addresses this by mounting SSR heatsinks externally, allowing for unobstructed airflow. Avoiding internal mounting prevents heat buildup and premature component failure, enhancing the lifecycle of the SSRs. These heatsinks are placed on standoffs to create a gap between the control enclosure and the SSR, promoting airflow and preventing heat transfer. This design has proven its effectiveness with a 6-year record of zero failures.

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.

The Icon brings an affordable touchscreen design to the market, offering a perfect blend of simplicity, efficiency, and outstanding performance.

With intuitive programming and a responsive touchscreen interface, the Icon ensures a seamless and user-friendly experience. Its flawless integration with Evenheat’s Quiet Drive Solid State relay system further elevates its reliability and operational excellence.

Building on Bartlett's trusted control platform, the Icon incorporates thoughtful innovations, including low-error Special Limits thermocouples for precise temperature control and non-metallic faceplates that enhance Wi-Fi connectivity for the Bartlett mobile app.

By combining cutting-edge features with reliable performance, the Icon delivers exceptional value and sets a new standard for kiln control systems.

For those exploring upgrades, Evenheat's Heat Treat units also offer two tried-and-true controller options: the RampMaster 3 and the TAP II.

The standout control option is the TAP, a powerful touchscreen controller, designed with all types of firing and heat processing in mind, exemplifying advanced control technology. For those who prefer a more traditional approach, the RampMaster 3 offers comprehensive firing control with a familiar four-digit interface.

Rampmaster 3

The RampMaster 3 sets the standard in heat treating ovens. It features a four-digit display and comes equipped with twelve program slots for storing your preferred heat treat programs. Its numbered keypad and program review key enhance user experience. Importantly, it's compatible with the innovative Quiet Drive Solid State Relay System, offering enhanced control and convenience. This combination makes the RampMaster 3 a highly regarded choice in kiln temperature control.

TAP II

The Evenheat TAP II stands out as a premier temperature controller, combining intuitive use, powerful functionality, and user-friendly operation. It simplifies accessing your heat treat programs with clear text displays. The TAP II guides you through the creation and fine-tuning of your programs to perfection, allowing unlimited program storage without the fear of data loss. It's renowned for its consistency and accuracy, especially when paired with the Quiet Drive Solid State output, ensuring exceptional performance. Additionally, the TAP II offers convenient connectivity to its app, available for iOS and Android, via Wi-Fi or Ethernet ports, making it a truly remarkable tool.

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.)