Miller Maxstar 150 STL TIG Stick Welder Review

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In Brief: Review of Miller Maxstar 150 STL 

The Maxstar 150 STL Welder by Miller is meant for your TIG or stick welding purposes and will be a good investment if you are looking for a lightweight, portable welder. This product is easy to use and at the same time, promises versatile application. It is a durable and reliable tool for your workshop.

An American manufacturer of arc welding and cutting equipment, Miller Electric is known for its reliable tools, one of which is the Maxstar 150 STL.

This company was founded in 1929 and has, over the years, grown into a global name.

It has a wide customer base that includes both professionals and hobbyists.

The Miller Maxstar 150 STL Welder is designed to make the TIG and stick welding processes easier to execute with the digital controls allowing for quick selection of settings and inverter technology making smoother operation possible.

With this machine, welding jobs can be finished quickly and efficiently.

Key Specifications of Miller Maxstar 150 STL

The Miller Maxstar 150 STL TIG Welder boasts of dual voltage technology with the two voltage settings being 115 V and 230 V.

The voltage setting can easily be changed with the help of a Multi Voltage Plug (MVP) that can easily be connected to any receptacle without requiring any tools for the process.

This product features inverter technology that provides for superior arc starts and great weld puddle control with the help of an inverter-based power source.

This technology is available for both TIG and Stick welding processes.

The Maxstar 150 STL is a lightweight machine that is quite portable and also has a durable construction that ensures safety when carrying the unit around the job site or transporting it from job site to job site.

Its compact design suits the welder on the road.

This welder allows for a range of applications including metal fabrication, maintenance and repair, construction, ship building, and so on.

Although it only provides for stick and TIG welding, it remains a versatile tool for the right worker.

Major Specifications of the Miller Maxstar 150 STL

Input Voltage115/230 V AC
Welder Maximum Output150 A
Welder Minimum Output5 A
Welder Duty Cycle30%
Rated Output150 A at 16 V
Input28/14.2 A
Welder Input Hz50/60 Hz
Welder Input Phase1
Maximum Open-Circuit Voltage90 V
Welded MaterialSteel
Material Thickness0.020 in. to 3/16 in.
Product Height9 in.
Product Width5 ½ in.
Product Depth13 ¼ in.
Weight14 lbs
PriceSlightly high
Warranty Duration3 years limited
Welding ProcessesStick, TIG
Suitable ForMetal Fabrication, Maintenance and Repair, Light and Heavy Manufacturing, Aerospace, Shipbuilding, Tube and Pipe, Automotive


How to Install Miller Maxstar 150 STL

The Miller Maxstar 150 STL requires no installation process apart from selecting the voltage setting that is required for the welding job at hand.

Since it comes with the Multi Voltage Plug, this welder can simply be plugged into the proper receptacle according to the welding application and operation can be begun.

How to Use Miller Maxstar 150 STL

To begin welding, switch ON the welder with the power switch and ensure that the light that comes on does not flash, signifying that the machine is fully energized.

Using the controls on the digital control panel, select the welding process according to the job at hand.

A TIG arc is initiated by bringing the electrode in contact with the workpiece and the workpiece is thus welded.


Miller Electric ensures a limited warranty of up to 3 years on the Maxstar 150 STL Welder.

Only available to the original retail purchaser of the product, this warranty begins on the date of purchase and is applicable only on units that have not been damaged by the customer in any way.

Any inherent defects in the material or workmanship of the unit warrant the customer to a free repair or exchange of their product by Miller Electric.

You can direct any warranty related questions to Miller’s customer service number, 920-734-9821.

Customer Review Analysis

The Miller Maxstart 150 STL Welder has received predominantly positive reviews by customers for its specialized features that make TIG and stick welding easy and hassle-free.

The inverter technology and dual voltage settings allow optimized performance that is at once efficient and easy.

Many buyers have complained about the inability of this welder to work with aluminum which reduces this product’s degree of versatility.

For its high price, it also only provides for two welding processes.

But for specialized welding jobs focused on TIG and stick welding, this model is the perfect tool to achieve professional level welding results.

Further, its portable construction makes this a favorite among workers who constantly have to lug around their tools from one place to another.


Pros/Cons of Miller Maxstar 150 STL

After reading up on consumer reports and expert comments, we drew the following pros and cons:


  • Dual voltage technology with voltage settings at 115 V and 230 V
  • Multi Voltage Plug allowing for easy voltage changes
  • Thermal overload protection ensures long engine life
  • Lightweight and easy to carry around
  • Durable construction
  • Power Factor Corrected feature prevents breakers from tripping
  • Warranty lasts up to 3 years
  • Suitable for both professionals and beginners for its ease of use


  • Only suitable for TIG and stick welding
  • Cannot weld aluminum and several other materials
  • Foot pedal not included
  • Slightly high on the price scale


Recommended Accessories with Miller Maxstar 150 STL

Customers who bought Miller Maxstar 150 STL also bought

Miller Electric Auto Darkening Welding Helmet:


Protective welding gloves, sold by Miller Electric:



Does this welder come with a manual gas valve on the torch?

No, this welder has a built-in gas valve that opens when you touch the tungsten to the base metal.

How thick of steel is this machine capable of welding?

At its most powerful performance, this machine can weld 3/8-inch thick steel.

Can this machine weld aluminum?

Since this machine is DC and aluminum welding requires AC, it is not capable of welding aluminum.

Our Recommendation

The Miller Maxstar has a limited range of applicability when it comes to compatible materials and number of welding processes that it can perform.

But for TIG and stick welding, it provides a range of features that makes work easy and precise.

If this welder’s variety of applications and your welding needs match, then its ease of portability and user convenience will ensure that it turns out to be a good investment for you.

About Harold Henderson

Harold is a fitness freak and spends a lot of time in the gym. He also is a DIY-er and is proud of his collection of power tools. When free, he loves binge-watching Netflix series!

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