For over 70 years, Leister has been the global leader in plastic welding and industrial hot-air applications.

Whether you're welding PVC, TPO or Modified Bitumen membranes, the performance and reliability of our products makes Leister the preferred choice of professional roofing contractors worldwide.

With our cutting-edge technology, high rate of innovation, extensive process expertise, unmatched stability and reliability (not to mention our decades of experience), we work with our qualified employees toward achieving the highest possible product quality.

These standards are the benchmarks for which all product lines that carry our brands, LEISTER, AXETRIS and WELDY, strive to meet. Our innumerable patents and registered designs highlight our development ability and strength in innovation.

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The VARIMAT 700

The VARIMAT 700 is characterized by its robust construction and ergonomic design. The automatic roof welding machine comes in a sturdy rolling transport case, ensuring convenient and safe transportation to the place of use.

With a dead weight of 37 kg and optional additional weights, the VARIMAT 700 offers high joining pressure for constant process safety when welding thermoplastic sealing sheets and all types of membranes.

VARIMAT 700: benefits at a glance

• Optimized welding performance due to high contact pressure
• Swivel-in mechanism for quick and efficient nozzle insertion
• Visual and audible alarm when leaving the welding window with the Monitored Welding Assistant
• Flexible voltage selection between 230 V and 400 V
• Removable weights for easier transportation
• Triangular design ensures directional stability
• Sturdy rolling transport case for perfect device protection and ergonomic transportation
• LQS (Leister Quality System) for quality reporting
• Tried and tested welding recipes
• High welding speed
• LED light

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Introducing the UNIDRIVE 500 - Roof Welding Close to the Edge Made Easy

The new UNIROOF AT/ST roof welder is your flexible partner for welding thermoplastic roofing membranes on flat or pitched roofs (up to 30°).

Thanks to its slim design and construction, as well as the movable transport axle converting of the machine is no longer needed. Now, you can effortlessly weld close to the edge (to 100 mm ) at the parapet or on the parapet and as easily in narrow circumstances.

The UNIDRIVE 500 closes the gap between manual and automatic welding in a small, 9.9 lbs. lightweight and easy-to-handle semi-automatic hot-air welder.

Radius welds quickly and efficiently with the UNIROOF AT / ST. Pipe collars can be welded easily and quickly with the flexible axle of the UNIROOF AT / ST. Weld roofing membranes up to three times faster than hand welding with the UNIDRIVE 500. It's rotating nozzle and reversible drive makes UNIDRIVE 500 ideal for welding close to the edge and in tight spaces, either on or at the roof parapet, flashing wall, edge and curb details, as well as horizontal and vertical surfaces. The tool is equipped with three handles to provide ultimate welding comfort and balance. In addition, the UNIDRIVE 500 can be easily operated via its digital display.

• Reliable: Ergonomic handles for balanced pressure and comfort while welding

• Fast: Up to three times faster than manual welding

• Versatile: Rotating nozzle and reversible drive for dual-direction welding

• Practical: Compact and lightweight at 9.9 lbs.

• Economical: Low maintenance due to its brushless motors

• Intuitive: Simple user guidance and operation via digital display

• No converting: Thanks to the movable transport axle the UNIROOF masters welding closte to edge at or on top of the parapet. 

• Swiss Quality you can rely on: Field-tested design for ergonomic handling, flexible relocating and optimal machine guiding.

• The direct-driven, maintenance-free pressure wheel [drive motor integrated in pressure wheel] leads to clearly optimized overall performance and is easy to service. 

• Greater efficiency at construction sites: The new UNIROOF class brings an additional 38% (ST) to 66% (AT) higher welding performance compared to similar machines. 

• Welding roof structure profiles with a special profile kit. 

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Radius welding with UNIROOF AT/ ST

Single Ply Roof Membrane Welding with the LEISTER Triac ST

The Leister Triac ST plastic welding tool being shown in use on the roof for single ply membrane welding

The TRIAC AT shows, at the push of a button, the current mains voltage (quality checking before the welding process)

The built-in motion sensor knows when the tool is not in operation and reduces the blower level to its minimum speed, which means up to 40% energy saving and noise reduction

Handiness, reliability and versatility are the key arguments in favor of the TRIAC ST. Its two-component handle gives users perfect grip, while the low weight of less than a kg ensures optimum weight balance. The  innovative motor and turbine design, combined with the heating element familiar from the TRIAC AT, enhance  the value even more. More than 80 nozzles fit onto the TRIAC ST; these are also compatible with the TRIAC AT and TRIAC S. 

• 100% Swiss made quality 

• 60 years of expertise in making hot-air tools – brought together in the new TRIAC ST 

• The sturdy, professional hot-air tool that weighs less than 1 kg/2.18 lbs 

• Functional design: two-component handle grip and optimum center of gravity ensure ergonomic working 

• Quick clean air filters 

• Automatic carbon stop (collector protection) and heating element protection 

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Latest Podcasts

Dave Nordentoft - Redesigned VARIMAT

S6:E10 In this exciting episode of Roofing Road Trips, Heidi J. Ellsworth sits down with Dave Nordentoft from Leister to talk about the brand-new, redesigned VARIMAT automatic heat welder. Dave gives us a brief history of the VARIMAT and then dives right into the improvements made in this new version. ...
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Dave Nordentoft - Tips and Tricks to Maintain Equipment

S5:E57 Heidi J. Ellsworth meets up with Dave Nordentoft of Leister about the importance of heat welding equipment maintenance. Dave shares the value of creating an ongoing maintenance program and some of the tips and tricks for keeping equipment at top performance. Contractors will learn how to not only ...
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Dave Nordentoft - The New Technology of Heat Welding

S5:E30 Heidi J. Ellsworth virtually meets up with Dave Nordentoft of Leister to talk about a leading technology that is changing the industry: Leister Quality System (LQS) Technology. With performance and production at the top of the list for every commercial roofing company, LQS Technology offers the opportunity to monitor ...
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The VARIMAT 700 is characterized by its robust construction and ergonomic design. The automatic roof welding machine comes in a sturdy rolling transport case, ensuring convenient and safe transportation to the place of use. With a dead weight of 37 kg and optional additional weights, the VARIMAT 700 offers high ...
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Leister Technologies, LLC is proud to announce the launch of our new eCommerce store, supporting the online sale of select heat guns, stationary welders, automatic welders and accessories. Visit leister.store to place your online order today!
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For over 70 years, Leister has been the global leader in plastic welding and industrial hot-air applications. Whether you're welding PVC, TPO or Modified Bitumen membranes, the performance and reliability of our products makes Leister the preferred choice of professional roofing contractors worldwide. See more videos from Leister on their YouTube ...
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