Industrial Heat Sources

How to Save on Leister and BAK Replacement Parts

There is healthy demand for hot air tool replacement parts, such as nozzles, heating elements, mica tubes and more. Regular use and time often damage or break down these parts, rendering tools useless. 

Unfortunately, in most cases, equipment manufacturers own their tool’s spare-part market, so purchasing replacements can get pricey.

But that doesn’t mean you have to fork over hundreds or thousands of dollars a year to keep your tools in working order. 

All you need is to find a company with a deep understanding of a manufacturer’s hot air tools, and the means to develop their own line of parts. 

Enter Industrial Heat Sources.

How to Save on Replacement Parts

IHS has developed our own line of direct replacement parts for popular Leister and BAK tools. Our replacement parts are:

  • Built out of high quality materials so they last.
  • Designed to the exact specifications of each tool.
  • Seamlessly interchangeable with original parts.
  • Priced much lower than the manufacturer’s replacement parts. 

In addition, we make finding replacement parts easy. Search our inventory by part type or hot air tool:

Search for Parts by Type or Hot Air Tool:

Part Type Hot Air Tool
Air Hoses BAK RION
Belts Leister DIODE
Carbon Brushes Leister ELECTRON
Electronics Leister HOTWIND S
Gaskets Leister LE 3000, 3300, 5000 and 10000
Handles Leister LHS 20S, 20L, 21S, 21L, 40S, 40L, 41S, 41L and 61S
Heating Elements Leister MISTRAL
Mica Tubes Leister ROBUST
Nozzles Leister TRIAC STRIAC ST
Wheels Leister UNIROOF AT
  Leister VULCAN E


For more information, contact IHS at 844-862-7880 or email


* Leister product names are registered trade names of Leister Technologies, LLC. IHS has no affiliation with Leister Technologies, LLC.

Bringing Innovation to Roofing: The Story Behind the Seamrover DD

"If no one would create the hot-air welder contractors were demanding, we would."


I’ve been in the roofing industry throughout my entire career. I started as a contractor, and eventually launched my own roofing equipment distribution company, Hy-Tech Products.  

From 1984 through 2014 (the year I sold the company to my son), I had the chance to work with many roofers across the Midwest. During that time, we sold and serviced hundreds of automatic seam welders. We also received no shortage of… lets say…“colorful feedback” on their drawbacks. 

Most frequently, the concerns centered on two areas:

  • The safety and well being of employees. The question we heard all the time was, “Why do my guys have to walk backward on a roof?” 
  • The inefficiency associated with lugging a welder and all associated power equipment across the roof to start welding the next seam.

We were also bothered by the fact that welder technology hadn’t been upgraded in decades. The most significant advancements in the past 15 years were a digital interface and preset welding profiles. 

Meanwhile, most other industries improved worker safety, performance and efficiency thanks to significant technological advancements.  



“The roofing industry had been forgotten by those who profit from it.”


The conclusion we drew was the top hot-air tool manufacturers saw little reward in product research and development. Roofing contractors had been forgotten by those who profit from them. 

We were beyond fed up with the sorry state of roofing welders, so we decided to take action. 

If no one would create the hot-air tool contractors were demanding, we would. And in doing so, we'd take the industry in an entirely new direction. 


A Like-Minded Partner

“We were creating a completely revolutionary tool from the ground up.”


Our first step was to find a manufacturing partner, but it couldn’t be just anyone. We wanted an organization with a track record of producing high quality, reliable equipment. 

Through a fortunate series of events, we were introduced to Miller Weldmaster. They fit the bill perfectly for the mission we were undertaking. For more than 40 years, they’ve produced top-of-the-line welding equipment across a wide range of applications and industries—however, at the time, they had no in-the-field roofing welders. 

We met with Miller Weldmaster's team, and introduced our vision for a new automatic seam welder. After hearing our impassioned pitch and exploring the market potential, they were onboard. Soon thereafter, we began the design phase. 

We met regularly to discuss features, electronics, look, size, weight and everything between. During this time, Miller Weldmaster certainly lived up to their impeccable reputation. Their product development insights were invaluable, and they had no established manufacturing processes to lock us into how the tool could be built. 

We were creating a completely revolutionary tool from the ground up.


The First of Its Kind 



Question: What do you get when you fuse roofing experience, customer feedback, and engineering capabilities?

Answer: A revolutionary machine that redefines the standard for hot-air seam welders. 

We named our welder the Seamrover DD, with the “DD” signifying Dual Direction. This heavy-duty machine gives roofers: 

  • A dual-direction drive so they can always walk forward, no matter which way the welder is going.
  • GPS for tracking the welder’s movement and speed throughout a project.
  • An easily exportable record of weld settings, location and environmental factors that logs every foot traveled for later review and inspection.
  • Built-in weights over two soft-core press wheels for even, consistent seam pressure.
  • Two oversized press wheels to compensate for slight deviations off the seam.
  • And much more

At the 2016 IRE Show, alongside Miller Weldmaster, we introduced the Seamrover DD to the roofing industry. The reception was overwhelming.  

During one demo, we showed a crowd how easily the welder can change direction. In two words, Chip Goss, president of J. Wilhelm Roofing Co., summed up the reaction of everyone who'd visited our booth, “HOLY SH*T!”

A 25-year roofing veteran, Chip told us what most excited him was the huge labor savings that comes with eliminating the need walk across a roof just to start a new seam. 


Just Getting Warmed Up

We are working with Miller Weldmaster to introduce a brand new family of roofing hot-air tools and equipment—based on the needs of you, the roofer. 

Stay tunes for new product announcements. 


Hot Air Tool Troubleshooting: Weak Heat Output

If your hot-air tool isn’t reaching the proper temperature, or doesn’t get as hot as it once did. You may have a faulty heating element.

To check your heating element for defects, simply look at the front of it after it has heated up. If it’s working properly, the entire front-end should glow orange. In the image below, only half of the hot-air welding tool's heating element is illuminated, even though the machine is set at its maximum heat setting. This signals that the heating element is broken, and requires maintenance.

Safety Note: To avoid burns, don’t put any part of your body directly in front of the heat element while it is on and blowing air. Stand a minimum 10 feet back. 

Fixing a Clogged Heat Element Nozzle

Damage of this type can be caused by a clogged nozzle, which limits the amount of air pushed through the element. When too little air escapes, pressure grows within the hot-air tool, causing the element to overheat and burn out.  

To prevent this buildup, it’s important to clean off excess plastic from both the top and sides of the nozzle after every weld, using a stainless steel wire brush. See below for some tips:

  • Use a motion away from your body when scraping the plastic.
  • Make sure to clean the element while the nozzle is still hot. Once the plastic cools and hardens, the job becomes much more difficult. 
  • Protect your hands and eyes from heat and melted plastic by wearing protective gloves and glasses, and holding the tool in a clamp.

By routinely cleaning hot-air tool nozzles after every use, you can help to extend the life of the element. This will reduce unnecessary downtime, and save you money in ongoing maintenance and supply replenishment. 

If you’re still having pour heat output after cleaning the nozzle, please contact IHS’ service center for assistance. 

How to Weld with a Hot-Air Hand Tool

In roofing, you'll often be required to perform an overlap weld to join two pieces of thermoplastic (i.e. TPO, PVC, PPE), or plastic-coated fabrics. Below we've outlined the steps to seam welding with a hot-air hand tool

NOTE: Before welding your final product, perform a test weld on scrap material. This ensures that you’re using the proper heat settings and welding technique. We’ve also included tips on how to test the quality of your weld, and how to adjust your hot-air hand tool based on the results of this test.

  1. Attach an overlap welding nozzle to your hand tool, and preheat it to the proper welding temperature.
  2. Overlap the two pieces of plastic material, or plastic coated fabric, by 1-2 inches.
  3. Insert the nozzle between the fabric pieces, and place the pressure roller on the top fabric near the end of the nozzle.
  4. Heat the material, and simultaneously apply direct pressure with the pressure roller to secure the bond.
  5. Make sure to weld all the way to the seam edge, and ensure that there are no gaps or voids.

To quality test your overlap weld, join two pieces of scrap material together, let the seam cool for 10-15 seconds, and then rip the pieces apart. With a good weld, part of the welded fabric will be stuck to the other piece, and you will see the fabric’s scrim.

If only part of the fabric tears away and/or no scrim is showing, you’ll need to apply more heat, increase the pressure or weld slower. If the fabric bubbles or distorts or if the scrim melts, you’ll need to turn down the heat and/or weld faster. 

For more information on how to weld with a hot-air hand tool, contact one of our representatives at

6 Ways to Keep a Hot Air Plastic Welder in Peak Condition

Proper use and maintenance can keep your hot-air plastic welder in peak operating condition. Prevent downtime, maintain maximum performance and extend your tool’s life expectancy with these 6 preventative maintenance tips.

1. Clean Tools Regularly

After every use, make sure that filters and nozzles are cleaned of any obstructions. Regular cleaning prevents melted-on plastic and debris from building up, which can restrict airflow, cause temperature fluctuations and inconsistencies, and lead to element burnouts.

To clean nozzles, put on protective gloves and goggles. Then, while the nozzle is still hot, scrape the melted plastic away with a stainless steel or brass wire brush. Use a motion that goes away from your body, and continue until the nozzle looks smooth (avoid touching).

To clean filters, you should use mild soap, water, silicone and/or compressed air to remove blockages. 

2. Apply Air Filters

Air filters prevent dust, debris and other contaminants from entering the tool. Be sure to use filters when working in dirty environments to prevent unwanted materials from getting into and clogging your tool’s air intake or heating element.

Keep in mind, however, that standard hot air tool air filters will not effectively remove all types of contaminants. In situations where your tool is exposed to harsh dusts (e.g. metal, electrically conductive or damp), special filters must be used.

3. Select the Right Nozzle

The wrong nozzle on a plastic welder can restrict airflow, and cause heat to back up within the tool. This hot-air backup overheats and breaks the element, and may cause damage to other parts of the machine.

Work with an IHS representative to ensure the nozzle you purchase is ideally suited for the plastic welder’s intended use. 

4. Cool Your Tool — Every Time

To prolong its life, a hot-air tool’s heating element needs to be gradually cooled down after every use. This is done by blowing cool air through it until it reaches ambient temperature.

Review your plastic welder's instructions carefully. It should comes with detailed directions on how to properly cool down and shut off the tool. Make sure to cool down your tool after every use. 

5. Employ the Correct Power Source

For hot-air plastic welders to function properly, they need the correct power source. Too much power can damage the tool, while too little can negatively affect its ability to produce hot air at a consistent volume and temperature.

Look up minimum power requirements in your tool’s instruction manual or on its label, and make sure your power source can consistently provide adequate power. If you have welding issues, start troubleshooting at your power source using these tips.

6. Properly Store Between Uses

When not in use, keep the plastic welder in its storage case. The case is designed to keep the tool safe from accidental contact, and away from prolonged exposure to sunlight, moisture, dirt and other elements.

Proper Maintenance = Maximized Life

Miller Weldmaster plastic welders are some of the highest quality plastic welding tools on the market, and if properly maintained and cared for, are also some of the longest lasting. Maximize the life and performance of your hot-air tool by following the steps above, and have tools regularly serviced by a certified Miller Service Center.

For more information on how to keep your plastic welder in good working condition, contact one of our sales and service representatives at


6 Single-Ply Roofing Tools Contractors Need

Over the past 35 years, single-ply thermoplastic membranes—such as TPO and PVC—have grown in popularity as an effective alternative to asphalt-based commercial and industrial roofing systems. This shift is largely due to single-ply’s ease of installation, relatively low cost, durability, and its energy-cost saving potential.

However, a singly-ply roofing system is only as good as its seam welds. To consistently create durable, watertight seams that can withstand heavy weathering (i.e. wind, rain, snow, standing water and sun), you’ll need to invest in the right equipment.

Following is an overview on the type of equipment needed for quality single-ply roof seam welding.

1. Automatic Walk Welder

Automatic walk welders are designed to roll along straight seams while applying consistent heat and pressure. The result is a quality, reproducible weld. When purchasing, look for a welder with:

  • Digital display that shows both set and actual temperatures, giving you more control over heat output. These displays should also alert you of any malfunctions, such as a faulty heating element. 
  • Drive motor powerful enough to handle slight roofing inclines.
  • Silicon-based pressure roller to ensure even pressure is applied to a seam despite small surface inconsistencies.
  • Guide bar that will allow you to steer the machine without having to bend over, limiting fatigue and increasing daily output.
  • Option to add extra weight over the pressure roller for greater seam pressure.
  • Forward driving is a new feature found only in the Seamrover DD. Unlike other automatic welders, roofers can walk forward along the path of the seam versus backwards, where the potential of tripping is greater. 

2. Hot-Air Hand Tool

Hot-air hand tools enable you to weld seams in corners or confined areas, and on curbs or vertical surfaces. When purchasing a heat gun, look for:

  • Lightweight and ergonomic design to reduce muscle strain while holding it in various positions, or for extended periods of time.
  • Heat-protection tube to avoid accidental burns.
  • Overlap, or slot, welding nozzle attachment—these are specifically designed for welding two pieces of overlapped material.

3. Hand Pressure Roller

When welding with a hot-air hand tool, you’ll need a hand pressure roller to evenly press the heated material together and form a strong bond. Make sure your roller is:

  • Made of silicone to ensure consistent pressure is applied despite surface inconsistencies.
  • Approximately three inches wide for greater surface area coverage.

4. Wire Brush

When welding plastic materials, it is likely that some of the plastic will stick to the welder’s nozzle. A build up of this plastic can restrict airflow and potentially damage the heating element or the tool itself. Use a stainless steel or brass wire brush to scrape away the melted-on plastic while it is still hot, to keep your equipment in peak operating condition.

5. Generator

Poor power supply can impact a hot-air welder’s heat output, which can lead to inconsistent seam welds. For this reason, when possible, avoid relying on the building’s power outlets, and instead utilize a power generator.

To determine the generator power capacity you need, consider the electrical requirements of the tools being used and how may of these tools are operated simultaneously. Make sure the generator you select is available with a dolly cart for easy maneuvering. If possible, also get a hoisting kit, to simplify lifting the generator to the roof.

6. Extension Cords

Invest in extension cords to avoid having to repeatedly interrupt work to relocate or change your power source. Roofing power cords should offer the current carrying capacity required by your welder—for example, a 240-Volt automatic walk welder needs a 50 Amp/ 250 volt cord. The cord should also be:

  • Grounded
  • 10 gauge 3 wire
  • 100 feet or less in length 

Additional Reading:


8 Plastic Welding Safety Tips

The tools of any trade can pose safety risks if improperly used or maintained. To keep operators of  hot-air hand tools and automatic walk welders safe, it is the responsibility of employers, supervisors and peers, to make sure proper precautions are routinely taken.  

Following are 8 tips you can use to help keep Leister equipment operators safe:

Plastic Welding Safety Tips

1. Review Safety Instructions—Every operator should read their tool's safety instructions. If you have any questions, or would need further clarification on any item listed, contact your sales and service representatives

2. Review M.S.D. Sheets—Plastics Magazine recommends reading the material safety data (M.S.D.) sheets of the plastic your welding. Among other things, these sheets are required to detail the plastic’s hazardous ingredients, fire and explosion hazard information, preventative actions, and first-aid recommendations. Request these sheets from the plastic manufacturer.

3. Train Employees—Train all personnel on how to properly use the welder(s) they will be operating. Specifically, demonstrate how to turn the welder on, run it, shut it down, clean it after use, and what to do in the case of a malfunction or emergency—for example, if a drive motor shuts down while welding or if plastic material catches fire. 

4. Store Properly Between Uses—After completing a weld, an operator may set down the hot-air tool, or leave the walk welder to prep for the next weld. Because the machine will still be hot and likely blowing hot air, make sure to do the following:

  • Hot-Air Hand Tools—Set the tool on a flat surface where it won’t roll, or in a stand with the nozzle pointed away from the surface. Also keep the hot-air stream and nozzle away from flammable materials and body parts to avoid the risk of fire and burns. 
  • Automatic Walk Welder—Secure the welding nozzle in the up, locked position, and move it away from heavy traffic areas and flammable materials.  

5. Clean Work Areas—Remove any clutter from the work area to ensure a full range of movement. This helps the operator avoid knocking over or spilling anything that may damage the plastic material, catch fire, or require an immediate cleanup. Hastily setting down the tool to clean messes can lead to improper storage between use.

6. Clean Plastic Surfaces—Remove any contaminants that may be on the plastic being welded, including grease, oils, dirt and moisture. These contaminants may be fire risks or cause the plastic not to weld at all, possibly leading the operator to turn up the heat to unsafe levels to attain a weld. 

7. Properly Maintain the Tool—Scrape away melted plastic after each use, and clean air filters of dust and contaminants to ensure the tool receives the proper air supply. Both of these issues can lead to heat backup and overheating. In addition, make sure to replace any frayed or sliced electrical cords to avoid accidental shock. 

8. Wear Proper Attire and Equipment—Make sure all operators are wearing the proper protective equipment (PPE) to limit exposure to heated air and surfaces, as well as any airborne plastic or debris. PPE should include long sleeve shirts, pants, gloves and protective eyewear. In addition, depending on the plastic being welded and ventilation, a respirator may be necessary. 

What more should companies do to protect their employees operating hot-air hand tools and automatic walk welders? Please share your thoughts in the comments below. 

(Image: Wikipedia)

Industrial Heat Sources Named a World-Class Customer Service Honoree

We are excited to announce that IHS was recently recognized as a 2012 World-Class Customer Service Honoree. 

Hosted by Smart Business, the World-Class Customer Service Awards honor Northeast Ohio companies who have made the commitment to delivering the highest level of service and support, and who regularly go above and beyond to exceed customer expectations.

Honorees were selected by a panel of judges, composed of world-class customer service sponsors, who evaluated nominees on their philosophy, systems, promises and culture.

To be considered, IHS had to submit four essays describing, among other things:

  • How we make service one of our core competitive advantages.
  • The systems we have in place to allow for the delivery of world-class customer service.
  • How our customer service transcends the physical products we sell. 
  • Our training programs and the ongoing education requirements for employees.

In addition, we provided customer testimonials and two case studies that exemplify our commitment to customer service. You can read one of these stories, featured in the June issue of Smart Business Magazine—How Industrial Heat Sources Does Whatever It Takes to Help Its Customers.

We are honored by the judge’s selection of IHS as a 2012 honoree. Unparalleled customer service has always been a cornerstone of our business, and this award helps to validate the effort and commitment we continue to make every day.