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Soldering copper isn’t hard, but a bad torch makes it miserable — weak flame, finicky ignition, joints that never get hot enough to draw solder. A good trigger-start torch lights instantly, holds a steady flame at any angle, and gets the joint to temperature fast so the solder flows clean.
Here’s what I’d hand a homeowner learning to sweat copper, plus the pro torch I actually use.
Best Overall: Bernzomatic TS8000 Trigger-Start Torch
The TS8000 is the torch most plumbers carry. Instant trigger-start ignition (even in the cold), a run-lock so you’re not holding the trigger, and an adjustable swirl flame you can dial from a pencil tip to a wide flame for bigger pipe. Pair it with MAP-Pro gas and it heats joints fast. Buy the head; add fuel separately.
Best Starter Kit: Bernzomatic Basic Plumbing Torch Kit
If you just need to fix a joint or two, the basic kit bundles a trigger-start torch with everything to complete a copper soldering job. The flame isn’t as hot or adjustable as the TS8000, but for occasional home repairs it lights easily and gets standard 1/2″ and 3/4″ joints hot enough. Great low-cost entry.
Best Fuel Upgrade: MAP-Pro Gas Cylinder
Not a torch, but the upgrade that matters: MAP-Pro burns hotter than standard propane, so joints reach soldering temperature noticeably faster — especially on 3/4″ and larger pipe. Run it with the TS8000 and you’ll spend less time waiting on each joint. Worth the small price bump over yellow-bottle propane.
How to Solder (Sweat) a Copper Joint
- Cut the pipe square and deburr it, then sand the pipe end and the inside of the fitting until bright with emery cloth.
- Apply a thin, even coat of flux to both the pipe and fitting, then assemble the joint.
- Heat the fitting (not the solder) with the torch, moving around the joint to spread the heat evenly.
- Touch the solder to the joint seam — when the copper is hot enough, capillary action pulls the solder all the way around. Feed about a pipe-diameter’s length of solder.
- Let it cool undisturbed, then wipe the joint with a damp rag. Always keep a fire-safe cloth behind the work and a spray bottle nearby.
FAQ
Propane or MAP-Pro for soldering copper?
Both work for standard residential copper. Propane is cheaper and fine for 1/2″ lines; MAP-Pro burns hotter and brings larger pipe (3/4″ and up) to temperature faster, which makes soldering quicker and easier. For most DIYers a TS8000 with MAP-Pro is the sweet spot.
Why won’t my solder flow into the joint?
Almost always it’s not hot enough, or it wasn’t cleaned and fluxed. Solder flows toward heat by capillary action — heat the fitting evenly until flux sizzles, then touch the solder to the seam (not the flame). If it still beads up, the copper wasn’t sanded bright or you skipped flux.
Is it safe to solder pipes near wood framing?
Use a flame-resistant cloth or heat shield behind the joint, keep a spray bottle or extinguisher within reach, and never solder against dry framing without protection. Many house fires start hours after soldering — re-check the area before you leave, or use push-to-connect fittings where an open flame is risky.
Bottom Line
For anyone soldering more than a single joint, the Bernzomatic TS8000 with MAP-Pro gas is the combo to get — instant ignition, hot flame, and a run-lock that saves your hand. Just patching one joint? The basic kit does the job. And where an open flame is too risky, remember push-to-connect fittings are a no-torch alternative.