Weller PSI100K Super-Pro Cordless Butane Soldering Iron Kit - Portable

In this review the Weller PSI100K Super-Pro kit is evaluated for technicians and hobbyists who need a portable, fast-heating soldering solution. The bottom line: it is best for users who value mobility and quick heat-up combined with dependable solder wire performance, since the kit delivers rapid melting and a consistent flux core that aids smooth joints. The review notes mixed experiences with the self-ignition on some units, but overall finds the tool useful for field repairs and jobs where access to mains power is limited.

Key Features

• Cordless butane power: Provides true portability so users can work away from an outlet and handle field repairs or tight bench spaces.
• Optimized flux core: The included solder offers a guaranteed 100% continuous flux core for consistent solder flow and dependable joints.
• Fast heat-up: Heats quickly so tasks can start sooner, reducing downtime on small repairs and assembly work.
• Reduced tip wear: Designed to lower tip consumption by up to 70% which can cut long-term maintenance and replacement costs.
• Quality solder joints: Alloy and flux formulation aim to produce durable joints that resist cracking even on demanding surfaces.
• Compact kit weight: The 100 g kit is lightweight and easy to carry in a toolbox or service bag for technicians on the move.

Who It's For

The Weller PSI100K is ideal for electricians, automotive technicians, and hobbyists who need a compact, portable soldering iron for on-site repairs and small assemblies. Its quick heat-up and consistent flux core make it useful where speed and reliable joints matter.

Users who rely on perfect self-ignition every time or who seldom work off-grid should consider a mains-powered iron or a butane model with a different ignition system, since customer feedback shows mixed experiences with the self-igniting feature. For heavy continuous production line soldering, a dedicated station may be more appropriate.

Pros & Cons

Pros

• Portable cordless operation makes it convenient for fieldwork and tight workspaces.
• Consistent 100% flux core solder helps produce clean, reliable joints with less rework.
• Fast heat-up and efficient melting speed up common repair and assembly tasks.
• Lower tip consumption reduces maintenance costs over time.

Cons

• Self-ignition reliability is mixed across users, so occasional manual lighting or troubleshooting may be needed.
• Not a direct replacement for a full soldering station in heavy continuous production settings.

Specifications

Brand	Weller
Model	PSI100K Super-Pro
Solder wire diameter	1.0 mm / 0.039 in
Solder alloy	Sn60Pb40
Flux content	2.2%
Kit weight	100 g / 3.527 oz

Our Verdict

The Weller PSI100K Super-Pro is a strong choice for those who need a portable butane soldering iron that heats quickly and uses a consistent flux-cored solder for durable joints. It offers good long-term value thanks to reduced tip wear and efficient performance, but users who require flawless self-ignition every time or who operate high-volume production should evaluate mains-based alternatives.

Frequently Asked Questions

Does the kit include solder wire?
The kit includes Weller solder wire of 1.0 mm diameter with Sn60Pb40 alloy and 2.2% flux content.

Is the soldering iron suitable for automotive wiring?
Yes, customers reported it works well on heavier gauge auto wires due to fast heat-up and good solder flow.

How reliable is the self-igniting feature?
Ignition ability is mixed in feedback; many units light readily but some users report intermittent issues with the self-ignitor.