Evenheat KF Extreme Series Heat Treat Oven

Dive into the depths of precision heat treatment with the Evenheat KF Extreme Series Heat Treating Oven, uniquely designed for those who demand more. The KF Extreme Series, available in an extraordinary range of depths, is the ultimate solution for sword makers, high-volume knife and heat treaters, Damascus steel artisans, and anyone in need of expansive workspace.

Expansive Depths for Unlimited Possibilities

The KF Extreme models redefine spatial capacity in heat treating, with depths ranging from 31.5" to an impressive 49.5". These ovens are equipped with dual doors, ensuring easy access and efficient operation, even for the largest projects.

Exceptional Temperature Distribution

Embracing the side-element-only design of the renowned LB Series, the KF Extreme ovens guarantee exceptional and consistent temperature distribution. This feature is critical for precise heat treatment, making it a favorite among professionals.

Tailored for the Artisans

Whether you are forging swords, crafting volume knives, creating Damascus steel, or require extensive space for your projects, the KF Extreme Series is tailored to meet your needs. Its versatility caters to a wide range of users, offering a professional solution to every ambitious project.

Control Options for Precision and Ease

You now have three advanced control options to perfectly match your heat-treating needs! The brand-new standard controller is the Icon, built on Bartlett's innovative Spark platform. Extensively tested by Evenheat and others before release, this controller has received rave reviews from users. Prefer an upgrade? You can still choose the RampMaster 3 or TAP II controllers. Whatever you pick, you’re guaranteed exceptional performance!

Quiet Drive Solid State Relay – Now Standard

Evenheat has upgraded all knife and heat treat ovens to include the solid-state design as a standard feature. Visit the Solid State Relay tab to discover why this enhancement is a game-changer!

Five Depth Choices to Suit Every Need

The KF Extreme Series is available in five different depths: 31.5", 36", 40.5", 45", and 49.5". Select the size that best fits your project requirements and never feel restricted again.

Specifications at a Glance:

• Depths ranging from 31.5" to 49.5"
• Dual door design for easy access
• Side-element-only design for superior temperature distribution
• Ideal for sword makers, Damascus steel artisans, and more
• Variety of control options and standard Quiet Drive Solid State Relays

Your Ultimate Heat Treating Companion

Embrace the power and capacity of the Evenheat KF Extreme Series Ovens. Take the first step towards transforming your heat treating experience. With the KF Extreme Series, the depth of your creativity knows no bounds.

Chamber Dimensions

31.5" Deep x 10" Wide x 6.25" High - 1.18 Cubic Feet

(80 cm Deep x 25.4 cm Wide x 16.5 cm High - 33.4 L)

Outer Dimensions

37" Deep x 20" Wide x 19.5" High

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

Maximum Temperature

2200°F (1205°C)

Electrical

240 Volts, 30 Amps, 7200 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-50

Default production for KF Extreme Series models is 240V.

Evenheat will build KF Extreme Series models in 200V, 208V, 220V and 230by 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 Wye (380V, 400V, 415V) designs.

KF Extreme Series models are produced in a single phase design only.

Shipping Weight

150lb. (68 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.

Chamber Dimensions

36" Deep x 10" Wide x 6.25" High - 1.35 Cubic Feet

(91.4 cm Deep x 25.4 cm Wide x 16.5 cm High - 38.2 L)

Outer Dimensions

41.5" Deep x 20" Wide x 19.5" High

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

Maximum Temperature

2200°F (1205°C)

Electrical

240 Volts, 30 Amps, 7200 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-50

Default production for KF Extreme Series models is 240V.

Evenheat will build KF Extreme Series models in200V, 208V, 220V and 230by 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 Wye (380V, 400V, 415V) designs.

KF Extreme Series models are produced in a single phase design only.

Shipping Weight

160lb. (73 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.

Chamber Dimensions

40.5" Deep x 10" Wide x 6.25" High - 1.52 Cubic Feet

(102.9 cm Deep x 25.4 cm Wide x 16.5 cm High - 43 L)

Outer Dimensions

46" Deep x 20" Wide x 19.5" High

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

Maximum Temperature

2200°F (1205°C)

Electrical

240 Volts, 30 Amps, 7200 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-50

Default production for KF Extreme Series models is 240V.

Evenheat will build KF Extreme Series models in200V, 208V, 220V and 230by 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 Wye (380V, 400V, 415V) designs.

KF Extreme Series models are produced in a single phase design only.

Shipping Weight

175lb. (80 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.

Chamber Dimensions

45" Deep x 10" Wide x 6.25" High - 1.69 Cubic Feet

(114.3 cm Deep x 25.4 cm Wide x 16.5 cm High - 47.9 L)

Outer Dimensions

50.5" Deep x 20" Wide x 19.5" High

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

Maximum Temperature

2200°F (1205°C)

Electrical

240 Volts, 30 Amps, 7200 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-50

Default production for KF Extreme Series models is 240V.

Evenheat will build KF Extreme Series models in200V, 208V, 220V and 230by 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 Wye (380V, 400V, 415V) designs.

KF Extreme Series models are produced in a single phase design only.

Shipping Weight

185lb. (84 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.

Chamber Dimensions

49.5" Deep x 10" Wide x 6.25" High - 1.86 Cubic Feet

(125.7 cm Deep x 25.4 cm Wide x 16.5 cm High - 52.7 L)

Outer Dimensions

55" Deep x 20" Wide x 19.5" High

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

Maximum Temperature

2200°F (1205°C)

Electrical

240 Volts, 30 Amps, 7200 Watts, 60Hz, Single Phase

Power Cord Plug Configuration - NEMA 6-50

Default production for KF Extreme Series models is 240V.

Evenheat will build KF Extreme Series models in200V, 208V, 220V and 230by 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 Wye (380V, 400V, 415V) designs.

KF Extreme Series models are produced in a single phase design only.

Shipping Weight

200lb. (91 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.

Chamber Depths from 31.5" to 49.5"

The KF Extreme Series is expertly crafted for extended projects like Damascus steel creation, firearm components, and, naturally, swords and more.

Available in a range of chamber depths, starting from 31.5" and extending up to 49.5", these ovens cater to a variety of lengthy workpieces.

Side-only Heating Elements

KF Extreme models feature side-only heating elements, a design approach shared with Evenheat's LB Series, ensuring outstanding temperature distribution throughout the entire length of the chamber.

Dual Side Opening Door

The extra deep chambers of the KF Extreme's require the use of dual doors, front and back.

Cool Touch Handle

Evenheat's innovative swing-out door boasts a front-positioned handle/latch for effortless access, eschewing the traditional side placement. This handle, made from cool-to-the-touch phenolic material, is designed for one-handed operation and also serves as the door latch, merging ease of use with practical functionality.

Relay Access Port

Every KF Extreme model includes Evenheat's innovative Relay Access Port, designed for hassle-free relay replacement without the need to remove the entire control panel. This is a very nice-to-have feature even on a unit with a standard solid-state design.

That's because solid-state units utilize a mechanical relay as an essential safety feature.

This smart design addresses the inherent nature of solid-state systems, which are never entirely on or off and may generate a slight, nearly imperceptible leakage current to the elements. The mechanical relay resolves this by physically breaking the circuit, completely eliminating any leakage. It activates only twice during a firing cycle: once at the start to allow current flow and once at the end to shut it off entirely. Designed for durability, the safety relay rarely requires replacement, and the convenient Relay Access Port makes maintenance effortless if needed. This is precision engineering at its finest!

Door Shields

The KF Extreme is equipped with door shields, serving a dual purpose: they safeguard against damage to the firebrick and also minimize the heat exposure on the doors and door handles, enhancing safety and durability.

Swing View Equipped

Evenheat seamlessly integrates its sophisticated TAP II and RampMaster 3 temperature controls into the revolutionary Swing View Adjustable Enclosure.

This innovative design features an adjustable, swing-up enclosure, enabling you to easily set the control panel at your ideal viewing and programming angle. Once adjusted, it can be smoothly returned to a flat position, providing excellent visibility from anywhere in your workshop. The design is intuitive and user-friendly, improving overall interaction.

Particularly beneficial for touchscreen controls like the TAP II, the Swing View Adjustable Enclosure allows for perfect alignment with your viewing angle, greatly enhancing the user experience with its practical and ergonomic design.

Loud Alarm Output Jack

A Loud Alarm output jack is included to connect the optional Loud Alarm. Enjoy 80db of irritating alarm bliss and never miss another quench.

2200°F (1205°C) Maximum Temperature

The KF Extreme models boast a maximum operational temperature of 2200°F (1204°C), a range that comfortably accommodates most steels used in knife making and machine shop applications.

The peak temperature capability is dictated by the type of heating element wire employed. For all KF Extreme model heating elements, we utilize a Sandvik Nickel-Chrome alloy wire. This alloy is renowned for its durability and stability, maintaining its integrity and performing exceptionally well at temperatures up to 2200°F.

Maintenance Parts Tag

Evenheat has simplified the replacement of worn parts by introducing a maintenance parts tag. This handy tag lists all the relevant Evenheat part numbers for frequently maintained components, streamlining your maintenance process. This thoughtful innovation is designed to ease your maintenance workload. It's exactly the kind of feature you've probably wished for in the past, right?

Strong Stand and Tool Rest

Stands are strong and include a tool rest.Cool!

The Power Interrupt Switch enhances safety by automatically cutting off power to the heating elements when the door opens and restoring it upon closure.

Employing a specialized safety switch, this feature is expertly designed for critical safety functions. The robust construction of the switch includes a mechanism that effectively separates and opens any contacts that may have fused or stuck, ensuring reliable and genuine safety.

Then it's great news the Quiet Drive Solid State Relay is now standard, available in all KF Extreme Series models.

Evenheat confidently anticipates that its solid state relay will endure for the entire lifespan of your unit. Read on to understand why this feature is so critical.

Understanding Relays: The Solid State Advantage

Solid state relays (SSRs) offer a robust and more reliable alternative to traditional mechanical relays, which operate with metal contacts that open and close via an electrically arcing magnet coil. SSRs, made from solid semiconductor materials, eliminate the need for moving parts and electrical arcing, resulting in several benefits, particularly in kiln applications where superior temperature control is crucial.

Benefit 1 - Longer Lifespan

SSRs' lack of moving parts and absence of electrical arcing contribute to a substantially longer life expectancy compared to mechanical relays. In kilns and furnaces, mechanical relays are often identified by a distinctive clicking sound, indicating wear over time due to constant switching, which can lead to expensive repairs. In contrast, Evenheat's SSRs offer silent, reliable performance over the long term.

Benefit 2 - Precise Temperature Management

Whereas mechanical relays are limited to a minimum cycle of 10 to 14 seconds to balance control with relay lifespan, SSRs operate at a much faster rate of 120 cycles per second. This rapid operation allows for more immediate adjustments and finer temperature control, an advantage fully utilized in all Evenheat control designs.

Benefit 3 - Enhanced Durability of Heating Elements

The KF Extreme Series Heat Treating Oven from Evenheat uses SSRs featuring Zero Crossing technology. This technology switches the relay on and off precisely at 0V during fluctuations in AC power, greatly extending the life of heating elements compared to those reliant on mechanical relays. Zero Crossing ensures optimal voltage for the heating elements, thus maximizing their service life.

Design Feature - 30 Amp SSRs Operating at 15 Amps

Evenheat selects high-quality SSRs rated for 30 amps but operates them at a reduced 15 amps. This provides a safety margin, ensuring long-lasting and reliable performance. Running SSRs at half their rated capacity helps maintain cooler operation under a 15 amp load, keeping them well within their performance curve for optimal functioning.

Design Feature - Externally Mounted SSR Heatsinks

For optimal SSR performance, effective cooling is essential. Evenheat achieves this by mounting SSR heatsinks externally. This placement allows for free airflow and prevents heat build-up inside the unit, thereby avoiding premature component failure and extending the life of the SSRs. The heatsinks are strategically positioned on standoffs to create a gap, enhancing airflow and reducing heat transfer. This design approach has proven successful, with a six-year track 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.

Evenheat, in collaboration with SDS Industries and Bartlett Instrument, delivers exceptional design, technology, and performance in kiln control systems. The TAP stands out in this lineup as a state-of-the-art touchscreen controller, adept for all firing and heat processing needs and epitomizing the zenith of control technology. For enthusiasts of the traditional approach, the RampMaster 3 offers comprehensive control with an intuitive four-digit interface.

RampMaster 3: The Standard in Heat Treatment Control

The RampMaster 3 redefines excellence in heat treating ovens. It boasts a four-digit display and is equipped with twelve program slots for tailored heat treatment procedures. Its accessible numbered keypad and program review feature enhance the user experience. Crucially, it is integrated with the Quiet Drive Solid State Relay System, offering unmatched control and convenience. This combination positions the RampMaster 3 as a premier choice for precise kiln temperature management.

TAP II: The Forefront of Temperature Control Technology

The Evenheat TAP II represents the cutting edge in temperature control, merging ease of use with comprehensive functionality and user-centric design. It facilitates easy access to programs with its clear, readable displays. The TAP II aids in the meticulous creation and fine-tuning of programs, featuring unlimited storage capacity without the worry of data loss. Renowned for its reliable and precise performance, particularly when paired with the Quiet Drive Solid State output, it guarantees superior results. Additionally, the TAP II offers convenient connectivity through Wi-Fi or Ethernet, compatible with its app available on both iOS and Android platforms, making it a truly innovative and indispensable control tool in kiln operations.

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.)