⚠ Careful on USB chargers. Most "No name" units are Total Crap that can/will fry & take other things when they die.
Search YT for @DiodeGoneWild @bigclivedotcom for that & other iffy products.
"What do you use?"Depending on What I'm soldering, have Several Irons/Guns to use from 6W Iron to 250W Gun Type.
For HO & other Rails ~ 100W Weller Gun because Rails heat up fast @ a very small point without melting a bunch of plastic.
For Wires depends on wire gauge. 18AWG/1MM² & bigger often gets 100W to 250W Gun for same reason.
PC work gets 6W to ~ 25W depending on several things.
Some "People" claim High Watt guns/irons causes "problems..."
Not when used right & because Gun Types have 1 or 2 stage switches, they don't suck power for Hours + near Instant Heating & fast Cool Down so less of a Fire Hazard if the tip hits other things.
Weller is a Cooper Brand now & dropped many old types covering some heat ranges.
Some Gun Types have 2 stage Switches that delivers 2 heat ranges like Weller 8200-N 100W or 140W
Many Times can find old Weller Guns/Irons @ flea & other 2nd hand markets. Some May look bad but most still works even 60+ years later. Might need a new plug or cord. Old Weller Guns where the copper tip goes thru the Nut is way better then Current models using Screws to hold the tip.
Older models need smaller "Wire" Tips may have problems finding them. 8250 & related use the larger "Wire" Tips but are still sold @ most places.Edit4Correction: (6/4/26) I dug thru old supplies to find tips in packages to look up the numbers. The Small "Wire" Tip Current PN are 7135W 2x Plain tips or can get 7135N 1 tip w/ Nuts for Old Models. The Large "Wire" tips like S-500 8250A D550 uses Current PN are 7250W 2x Plain tips or 7250N 1 tip w/ Nuts (1 or both N number maybe Discontinued). If the Nuts are Good, can buy plain tips & reuse the Nuts. Weller also has other tip numbers to shape or cut other things & mostly came in Solder Kits that people rarely or never use. Most PN can get thru Amazon etc. Other old Weller Irons & their Parts was Discontinued Years Ago like the Light Blue "Pro" Irons I have.
Some RS/Tandy/Realistic Soldering were rebranded Weller but again Cooper stopped making some models & related parts. Might find old parts etc on Eflea. Others models were made god knows where even in the 1960's & 70's.
All electric work gets Eutectic or Low Temp Paste covered in
https://www.therailwire.net/forum/index.php?topic=61100.msg841996#msg841996Weller Maintenance:
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E2Add--> Finger Tight with a small Wrench. Don't deform or cut the tip by over tighten the Nut. A thin coat of Silicon oil/grease, Brake grease, GB OX-GARD, may help the connection to stay clean.