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Evenheat GTS 41 Glass Kiln

Save $1,352.00
Original Price $6,760.00
Current Price $5,408.00

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.

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Solid State Relay

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Evenheat's Most Popular Top-Loading Kiln: GTS 41

Have you met the GTS 41? Because it seems like everyone else has. Probably because it's ideal for so many projects!

For all glass firing including fusing, slumping, draping and kiln-casting up to 1800°F (982°C)

Revered for its innovative design tailored to the needs of the discerning glass artist, Evenheat's most popular top-loading model, the GTS 41 stands out in the market, offering a unique combination of size, functionality, and quality craftsmanship.

Revolutionary Design for the Modern Glass Artist

The GTS 41 is meticulously engineered to provide a superior top-loading experience without the drawbacks of a firebrick lid. Traditional firebrick lids, known for their weight and tendency to release particles, are a thing of the past with this model. The GTS 41 addresses this issue head-on, boasting a lightweight fiber lid that eliminates particle contamination, ensuring the pristine quality of your glasswork.

The Best of Both Worlds: Fiber Lid and Firebrick Chamber

What sets the GTS 41 apart is its harmonious blend of a fiber lid and a firebrick chamber. This combination offers the best of both worlds: the lightness and cleanliness of a fiber lid coupled with the heat-retaining properties of a firebrick chamber. This synergy results in a kiln that not only maintains consistent temperatures for optimal glass fusion but also ensures a user-friendly experience with its easy-to-lift lid.

Large Capacity for Ambitious Projects

As Evenheat's largest and best-selling top-loading glass kiln, the GTS 41 caters to artists seeking ample space for their creative endeavors. Whether you're a hobbyist exploring new designs or a professional crafting large-scale pieces, this kiln provides the capacity you need to realize your artistic vision.

A Testament to Evenheat's Quality and Innovation

The GTS 41 is more than just a kiln; it's a testament to Evenheat's commitment to quality, innovation, and responsiveness to the needs of glass artists. Each aspect of the GTS 41 is thoughtfully designed to enhance your glassworking experience, making it a worthy investment for artists dedicated to perfection in their craft.

Elevate Your Glass Artistry with the GTS 41

With the GTS 41, Evenheat once again proves its expertise in kiln technology, offering glass artists an unparalleled tool to expand their creative horizons. Embrace the future of glass fusion with the GTS 41 and experience the difference that comes with a top-loading kiln designed with your artistry in mind. Elevate your glassworking to new heights – choose the GTS 41 for a seamless blend of innovation, quality, and performance.

Chamber Dimensions 

25.25" Length x 40.55" Width x 13.5" Depth - 7.52 Cubic Feet

(64.1 cm L x 102.9 cm W x 34.3 cm D - 213 L)

Outer Dimensions

30.25" Long x 56" Wide x 29.5" High (with 8" stand)

(77 cm D x 142 cm W x 75 cm H)

Maximum Temperature

1800°F (982°C)


240 Volts, 45 Amps, 10,800 Watts, 60Hz, Single Phase.

Power Cord Plug Configuration - NEMA 6-50

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, 230V, 380V, 400V, and 415V. Contact Pottery Pulse to request pricing for and/or all other specifications for these power configurations.

Model will operate properly on both 50Hz and 60Hz.

​Model is available in 3 phase Delta and Wye (380V, 400V and 415V) designs. Again, contact Pottery Pulse to request.

Shipping Weight

335lb. (152 kg) - Approx.

Shipping Method

​Freight Truck​​

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

California Prop 65

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

Most Popular Top-Loading Kiln - GTS 41

Fiber Lid

The GTS 41 kiln features a lid made from a specialized fiber material, notable for its superb thermal characteristics and lightweight nature. This innovative design strategically places the heating elements on the lid's surface, enhancing heat distribution and optimizing firing efficiency.

In its construction, the lid utilizes a highly refined, extremely low-shot fiber material. To further improve its quality, the lid's surface is layered with a no-shot fiber sheet. The combination of these two materials results in a lid that is not only lighter but also significantly reduces the possibility of debris falling onto the glass during the firing process, ensuring a cleaner and more precise outcome.

Close-up view of fiber constructed interior lid of the Evenheat GTS 41 Glass Kiln

Top Access

The GTS 41 features a vertical-loading configuration and boasts a spacious interior chamber measuring 41 inches in width, 25.25 inches in length, and 13.5 inches in depth. Conveniently, the chamber's rim is situated 32 inches above the floor, aligning with waist or lower height. This ergonomic design simplifies the process of loading and arranging glass within the kiln.

Top down view of top-loading interior chamber of the 7.52 cubic foot Evenheat GTS 41 Glass Kiln

Fire and Firebrick Design

The GTS 41 kiln skillfully integrates two distinct materials in its construction: fiber and firebrick.

The lid is exclusively made of fiber, significantly reducing its weight and virtually eliminating the risk of loose firebrick particles contaminating the glass surface during firing.

Conversely, the kiln's walls and floor are crafted from firebrick. This material is particularly beneficial in glass kilns due to its heat retention properties. At the onset of firing, it absorbs heat, helping to stabilize temperature fluctuations. Then, towards the end of the firing process, it gradually releases heat, contributing to a superior annealing process. The result is truly remarkable.

Inheriting its design philosophy from the Studio Pro series, the GTS 41 represents a fusion of these two exceptional materials, culminating in what is arguably one of the finest kilns available.

Front-facing left-angled product shot of closed fiber and firebrick designed Evenheat GTS 41 Glass Kiln

Swing View Equipped

The temperature controls of the GTS 41 are incorporated into Evenheat's innovative Swing View Adjustable Enclosure.

This feature comprises a versatile, swing-up enclosure that enables you to pivot and adjust the control panel to your preferred viewing and programming angle. After setting or programming, you can simply lay it back down, allowing for easy visibility from anywhere in your studio. Its simplicity and convenience are key highlights.

Moreover, the Swing View is exceptionally compatible with touchscreen controls such as the TAP II, Icon+, and Icon. This compatibility ensures that the viewing angle can be precisely aligned for optimal ease of use. You're sure to appreciate the practicality and user-friendliness of this design.

Close up of TAP II controller in Evenheat swing view enclosure

2-Position Lid Vent

The GTS 41 features a lid vent adjustable to two positions.

In its lower setting, the vent raises the lid approximately one inch, optimizing the release of fumes from adhesives and other materials that bind at low temperatures.

When set to its upper position, the vent elevates the lid around four inches, facilitating a quicker cooling process.

Tight view of partially-opened Evenheat GTS 41 Glass Kiln to showcase its 2-position lid vent feature.

Relay Access Port

The GTS 41 features a convenient Relay Access Port, designed for straightforward and hassle-free relay replacement without the need to disassemble the control panel.

To access the mechanical relays, simply remove the access plate. This eliminates the cumbersome process of removing the entire control panel and navigating through internal wiring. The process is remarkably easy and efficient, requiring nothing more than a screwdriver.

Given the inevitability of mechanical relay failures over time, this Relay Access Port proves to be an extremely practical and time-saving feature when maintenance is needed.

opened relay access port on an Evenheat GTS 41 glass kiln

Maintenance Parts Tag

To make the replacement of worn parts easier, Evenheat has added a maintenance parts tag to the GTS 41, which lists the correct Evenheat part numbers for items likely to require maintenance. This is one of those no-brainers, huh?

Close up of maintenance parts tag from an Evenheat GTS 41 Glass Kiln

Power Interrupt Switch

The GTS 41 comes standard with a power interrupt switch, designed to automatically cut off electrical power to all heating elements whenever the lid is opened.

This safety feature is particularly crucial for users who might need to open the kiln during firing processes, such as for glass manipulation, ensuring a safer and more controlled working environment.

Close-up view of power interrupt switch mechanism on Evenheat GTS 41 Glass Kiln

The GTS 41 offers an array of control options, including the Icon, RampMaster 3, Icon+, Tap II.

Evenheat enhances the top control systems in the market by incorporating Special Limits thermocouples for accurate temperature measurement, along with non-metallic faceplates to boost Wi-Fi connectivity, especially for online applications.


The Icon, developed from Bartlett Industry's innovative Spark platform, has set a new standard in the industry with its state-of-the-art touchscreen technology, making it the go-to controller for the GTS 41.

Throughout the latter half of 2023, the Icon underwent rigorous field testing on the latest version of the Bartlett Spark platform. This endeavor was a joint effort between Bartlett, Evenheat, and other industry leaders, yielding impressive outcomes. The controller's programming was lauded for its intuitive, user-friendly design, while the touchscreen interface garnered widespread praise. Additionally, the Quiet Drive Solid State relay exhibited outstanding performance, culminating in a highly successful testing phase.

In alignment with Evenheat's dedication to pushing the boundaries of control technology, the Icon enhances the Spark platform with notable improvements. It integrates Special Limits thermocouples for unmatched temperature accuracy and non-metallic faceplates to improve Wi-Fi reception, ensuring smooth operation with the Bartlett online app. These innovations place the Icon at the pinnacle of industry standards, offering unparalleled performance and exceptional value.

RampMaster 3

The RampMaster 3, born from Bartlett Instruments' V6-CF platform, is tailor-made for glasswork, yet also excels in applications like heat treating. It stands out as the ideal choice for those who prefer a traditional interface to a touchscreen, featuring dedicated buttons and a clear display.

RampMaster 3 controller panel as shown on Evenheat Glass Kilns

As showcased in Evenheat Glass Kilns, the RampMaster 3 controller panel exemplifies Evenheat's dedication to producing top-notch control systems.

Consistent with Evenheat's high standards, the RampMaster 3 is equipped with a Special Limits thermocouple, ensuring precise temperature measurements. Combined with the Quiet Drive Solid State relay system, the RampMaster 3 offers outstanding performance while maintaining a classic, user-friendly interface. This controller is especially suited for craftsmen and artisans who appreciate the blend of traditional usability and advanced technology.


The Icon+, a product of the renowned Bartlett Genesis framework, sets new standards in controller technology. It is equipped with Special Limits thermocouples for unparalleled accuracy, and its design includes a non-metallic faceplate, significantly enhancing Wi-Fi reception. This design choice facilitates a flawless connection with the Bartlett online app, propelling the Icon+ into a new era of controller functionality.

The Icon+'s interface is crafted with user convenience in mind, ensuring an effortless and efficient experience. When this is paired with the state-of-the-art Quiet Drive Solid State Relay system, the Icon+ stands out as a transformative force in the industry. It represents a harmonious blend of Bartlett's technical expertise and Evenheat's dedication to innovation, marking a significant leap in control technology.


The TAP II, a standout controller in the Evenheat lineup, features a large display and an intuitive user interface, making it an exceptionally user-friendly option. It simplifies the creation and monitoring of firing schedules, effectively blending ease of use with precise control. Echoing the features of the Icon+, the TAP II is also fitted with Special Limits thermocouples and non-metallic faceplates, enhancing Wi-Fi reception for a stable connection with the SDS online app.

Choosing the TAP II offers a control experience that is both effective and uncomplicated. Its seamless integration with the online app, combined with its accurate temperature control capabilities, renders it an ideal choice for artists and craftsmen who value a harmonious mix of functionality and user-friendliness in their kiln operations.

The Evenheat Quiet Drive Solid State Relay System represents a technological zenith in kiln design. This advanced system stands out for its lack of mechanical components, offering a maintenance-free operation with lasting durability. Its ability to provide precise and consistent heating translates into work of exceptional quality.

Close up of Evenheat Kiln's Quiet Drive Solid State Relay on an Evenheat GTS 41 Glass Kiln

Embracing Solid-State Relays: A Revolution in Kiln Technology

Solid-state relays (SSRs) are a substantial improvement over traditional mechanical relays, which rely on physical contacts and electromagnets. SSRs use a solid-state semiconductor, eliminating moving parts, thereby reducing wear and significantly improving temperature control in kilns.

Advantage 1 - Superior Longevity:

SSRs are known for their extended lifespan, devoid of the mechanical wear and electrical arcing typical in mechanical relays. Unlike mechanical relays, which can be identified by a distinctive clicking sound denoting their operation and eventual wear, Evenheat's SSRs operate silently and reliably, greatly extending their operational life to align with the lifespan of your kiln.

Advantage 2 - Unmatched Temperature Precision:

Whereas mechanical relays typically cycle every 10 to 14 seconds to balance control and longevity, SSRs can cycle as frequently as 120 times per second. This rapid cycling capability allows for swift adjustments and exceptional temperature accuracy. Every Evenheat control system, including the sophisticated Icon controller, benefits from the rapid cycling of SSRs, achieving unparalleled temperature precision.

Advantage 3 - Extended Heating Element Life:

Employing Zero Crossing technology, SSRs activate at the zero-voltage point in AC power cycles, a strategy that prolongs the life of heating elements by maintaining optimal voltage levels. This contrasts with mechanical relays, which lack this level of precision.

Design Excellence - 30 Amp Rating:

Evenheat opts for SSRs rated at 30 amps but operates them at a conservative 15 amps. This design approach provides a substantial safety margin, ensuring the SSRs function within their derating curve even at a 15-amp load. This results in cooler operation and enhanced lifespan, reflecting Evenheat's commitment to superior design.

Design Excellence - Externally Mounted SSR Heatsinks:

The durability of SSRs greatly depends on effective cooling. To this end, Evenheat mounts the SSR heatsinks externally, promoting airflow and preventing heat buildup inside the control box. This design prevents heat transfer between the enclosure and the SSRs, with standoffs creating an air gap for additional cooling. This thoughtful design guarantees optimal performance of the SSRs, supported by an impressive six-year record of zero failures.

Estimated order to ship lead time is 6 weeks.

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