Master Appliance UT-40Si Ultratorch Review

The Master Appliance UT-40Si Ultratorch is a portable soldering iron that self-ignites and runs on butane gas. It is ideal for precision work because of its small size and lack of requirement for a power cord. It suits various soldering and heat application tasks, such as brazing, soldering, vinyl repairs, heat shrinking tubing, and spot drying. It can also effectively provide pinpoint heat as required.

The UT-40Si Ultratorch is economical and easy to use while featuring flameless heat. Its ignition is reliable, and the controls are easy to use, with the ignition being activated by a slide switch. The Ultratorch provides the equivalent heat of an 80-watt soldering iron, and together with its small body, this lightweight soldering iron is ideal for intricate jobs where extreme portability is a must.

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Features of the Master Appliance UT-40Si Ultratorch

Design – Compact size, lightweight, and completely portable equivalent to an 80-watt soldering iron
Suitable For – applying pinpoint heat, repairing vinyl, removing surface mount components, spot drying, soldering, de-soldering, and shrinking tubing
Body – is easy to hold and made from plastic
Temperature – can be adjusted up to 1200 degrees F and reaches the desired temperature quickly in as little as 30 seconds
Ignition – has a patented gas catalyst ignition system that is reliable and safe to use, and its inbuilt fuel filter also ensures reliable ignition via an easy-to-use slide switch
Fuel – uses butane and Master Ultratane butane is recommended for best performance.
Certifications – is UL listed as well as TUV/GS


Measures: 11.7 x 5.2 x 1.8 inches
Weighs: 5.3 ounces
Item No: 467-UT-40SI
Warranty: Limited 1 year warranty

What’s Great About the Master Appliance UT-40Si Ultratorch?

  • Ignition is reliable and generally lights on the first or second attempt
  • Power outlet and cords are not
  • Heats up very quickly
  • Controls are easy to use
  • Comes with one a heat blower nozzle and a soldering tip
  • Handy if you keep it in your car and/or boat
  • Small size and portability make it excellent for intricate work
  • Can interchange tips
  • Easy to re-fill
  • Easy to adjust temperature control

What’s Not so Great

  • Customer feedback indicates it doesn’t have a fuel level gauge, although advertising says that it does
  • Doesn’t have an insulated heat-proof cap to fit over the tip

Customer Feedback and Reviews

Feedback for the Master Appliance UT-40Si Ultratorch is average. People liked its fast heat-up time, reliable ignition, simple controls, and, most of all, its portability and lack of power cords.

A couple of customers would have preferred the ultratorch to have a fuel level gauge, but otherwise were satisfied with its performance. Other customers had issues getting the torch to light. To read more about what customers had to say, you can read their reviews here.

Recommendation – Cautious

The UT-40Si Ultratorch is available online and you can find the latest price for it here. Depending on your requirements, this soldering iron could have a place in your tool box and based on customer feedback, we recommend you read the online reviews before making a decision.

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