Neither is better everywhere. Press wins on speed and safety — about seven seconds a joint, no flame, and it seals on damp pipe. Solder wins on simplicity and flexibility: a torch, flux and solder are all it takes, and the joint can be reheated and modified later. The job decides, not the brand.
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Twenty years ago, joining copper pipe meant one thing: a torch, flux, solder, and a steady hand. Today you’ve got a second option that’s taken over a huge share of professional work — press fittings (ProPress is the brand name everyone uses, the way people say “Kleenex”). Press a fitting with the right tool and you’ve got a sealed joint in about seven seconds, no flame involved.
Seven seconds assumes the fitting is fully seated when the jaw closes, which is the one thing press gets wrong quietly — see press fitting insertion depth and the mark on the tube.
The consumables matter as much as the tool — see the solder and flux worth buying.
So which should you use? I’ve done plenty of both. The honest answer is: it depends on the job, and anyone who tells you one is always better is selling something. Here’s the real comparison.
The 30-second version
| ProPress (press fittings) | Soldering (sweat joints) | |
|---|---|---|
| Speed | ~7 seconds per joint | 1–3 minutes per joint |
| Flame? | No — safe in finished spaces | Yes — fire risk, needs clearance |
| Wet pipe OK? | Yes — presses on damp pipe | No — pipe must be bone dry |
| Skill needed | Low — easy to learn | Moderate — takes practice |
| Joint reusable later? | No — cut it out | Yes — reheat and modify |
| Best for | Volume work, wet repairs, no-flame zones | Small jobs, tight spaces |
If you only remember one thing: press wins on speed and safety; solder wins on simplicity and flexibility.
Press fittings vs solder: what actually differs
Most people search this as press fittings vs solder rather than by brand name, so to be clear about terms: ProPress is Viega’s brand, but NIBCO, Apollo and others make the same thing, and Viega and NIBCO each publish a matrix of the press tools and jaws their fittings are approved with. What follows applies to copper press fittings vs solder generally, whichever badge is on the fitting.
The difference is the seal itself. A soldered joint is a solid-metal bond — capillary action pulls molten solder into the gap and the whole joint becomes one piece of metal. A pressed joint is a mechanical crimp onto an EPDM O-ring: the jaw deforms the fitting around the tube and the O-ring does the sealing. Both are code-approved and both last; they just fail in different ways and forgive different mistakes.
Press fittings are built to ASME B16.51, which rates them for 200 psi from 32°F to 200°F on ASTM B88 copper tube — the same tube you would sweat. That is why this is a genuine choice of method rather than a choice of pipe.
What each one forgives
- Solder forgives a rough cut. A slight burr or an out-of-round end still sweats up fine, because molten solder fills the gap. It does not forgive water in the line, or a joint you cannot get a flame near.
- Press forgives water and finished spaces. It will press a damp line and it needs no flame, which is the whole argument in a finished basement. It does not forgive a burr — that nicks the O-ring on insertion — or a joint you forgot to press.
The failure mode nobody warns you about
On a big press job the classic mistake is the unpressed joint. It holds under no pressure, it looks completely finished, and you find it when the system is charged. Mark each joint as you press it. A soldered joint cannot fail this way — if you did not heat it, it visibly is not done.
Where ProPress shines
Speed. This is the whole reason pros switched. On a job with dozens of joints, seven-seconds-each adds up to hours saved. On volume work, that time is the case for press.
No flame. You can press inside a finished basement, next to insulation, in a tight crawlspace, or anywhere a torch would be a fire hazard or against code/insurance rules. No fire-watch, no scorched framing, no melted wire insulation.
Works on wet pipe. This is the underrated one. Solder will not flow into a joint with water in it — moisture turns to steam and ruins the joint. Press fittings seal on damp or even slightly wet pipe, which makes them fantastic for repairs where you can’t fully drain the system. (For more on repair options, see how to stop a leaking pipe.)
Low skill floor. A good soldered joint takes practice — too little heat and it won’t flow, too much and you burn the flux. A press joint is much harder to mess up: clean the pipe, mark your depth, line up the fitting, squeeze. That consistency is why crews can put newer hands on press work.
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Where soldering still wins
Cost. Soldering takes a torch, flux and solder. A press tool is a serious capital purchase, bought or rented, and it needs press fittings and the right jaws. For a few joints that is hard to justify; on a big job the hours saved are why crews press.
Tight and awkward spaces. A press jaw is bulky. In a cramped corner where you can barely get a hand in, a torch and a few inches of clearance often beat trying to fit a press head around the pipe.
Future flexibility. A soldered joint can be reheated, taken apart, and the fittings reused if you need to modify the run later. A press joint is permanent — if you change the layout, you cut it out and start with a new fitting. On a system you expect to alter, that matters.
Long-track-record durability. A properly soldered joint is a metallurgical bond that’s lasted in homes for 50+ years. Press joints are extremely reliable too (and have decades of field history now), but the O-ring is technically a wear component where solder is solid metal. For most installs it’s a non-issue — just worth an honest mention.
The cost reality, spelled out
The mistake people make is comparing only the tool prices. Run the whole number:
- Small job (a few joints): soldering wins easily. A few joints do not justify buying or even renting a press tool.
- Medium job (a bathroom, a partial repipe): rent a press tool for the day if you value the speed and no-flame safety; otherwise solder. Close call.
- Large/volume or paid work: press wins on labor. The hours saved are the point, and the no-flame safety reduces risk and liability.
This is why the rent-vs-buy call from our pro tools guide is so important — you don’t have to own a press tool to get its benefits on one big job.
One thing this choice does not settle: the tube itself. Press and solder both work on any ASTM B88 copper, so you still have to pick a wall thickness — Type L vs Type M covers where each is allowed and where the thin wall is a bad idea.
So which should you choose?
- DIYer doing one project? Solder it (or rent a press tool for the day if there’s water you can’t drain or a flame would be dangerous). Don’t buy a press tool for a single job.
- Handyman/remodeler doing occasional copper? Solder as your default; rent press when the job calls for speed or no-flame.
- Plumber doing copper regularly? Buy a press tool — the time savings are real. Keep your torch for the tight spots and small repairs where it still wins.
There’s also a third path homeowners ask about constantly: push-to-connect fittings like SharkBite. Those are a different tradeoff again — easy, and better for repairs than whole installs. We break that down in SharkBite vs. soldered copper.
If you have decided on press, the two decisions left are the tool and the fitting brand: RIDGID vs Milwaukee press tools compares the two systems most people cross-shop, and NIBCO Press vs Viega ProPress covers whether fitting brand actually matters.
Is ProPress better than soldering?
Not outright. On a big job, in a finished space, or on a line you cannot fully drain, press is better — about seven seconds a joint and no flame. On a couple of joints in a cramped corner, or on a run you expect to alter later, soldering is better. Both are code-approved.
When do plumbers still solder instead of press?
Three cases. A cramped corner where a bulky press jaw will not fit but a torch and a few inches of clearance will. A run you expect to modify later, because a soldered joint can be reheated, taken apart and the fittings reused. And a small job, where buying or renting a press tool makes no sense.
Are ProPress fittings reliable?
Viega backs them hard. Its ProPress systems pocket guide gives ProPress fittings a 50-year warranty against defects in material and workmanship in non-industrial, non-marine installations, and the fittings carry Smart Connect, a design that makes an unpressed joint show itself during pressure testing. A soldered joint carries no manufacturer warranty at all — you made it, so it is yours.
Can you solder a ProPress fitting?
No. Viega’s pocket guide calls soldering the female end of a ProPress fitting “not a recommended practice” that constitutes “improper use of the product, voiding any product warranties”, because the recessed groove that houses the EPDM seal interferes with the capillary action that draws solder around the tubing. Use a solder fitting instead.
Soldering near one is fine, with clearance. Viega asks for at least three pipe diameters between the torch and the press connection — its table sets 1½ inches on ½-inch tube and 6 inches on 2-inch. If you cannot get that, wrap the connection in a cold wet rag or sweat the joint before you press the fitting on.
Viega ProPress vs solder
Same copper tube, different seal. Viega’s sealing element is peroxidically cured EPDM rated 0°F to 250°F, which its seals and gaskets tech data says has particularly good resistance to hot water. Solder makes a solid-metal bond with no elastomer in it at all. Both are code-listed; Viega’s system data sheet lists ASME B16.51 and NSF-61.
Ready to go press?
If you’ve decided press is your method, two next steps: pick the tool in our best press tool guide (RIDGID vs. Milwaukee vs. DeWalt), and understand the fittings in best copper press fittings — they’re not all the same and brand compatibility has rules. Still soldering? Get a solid plumbing torch and a good pipe cutter and you’re set.
The press tool kit and the flux below are Amazon affiliate links; the coupling note gives its listing’s seller and stock on the day we checked.
If you’re pricing out the rest of a pro kit alongside the press decision, the pro & prosumer tools guides cover drain machines, inspection cameras and threaders the same way.
If you want to try press
- Viega ProPress copper couplings (not linked: third-party seller only, low stock, on 10/4/2026) — the fittings this comparison is about.
- RIDGID RP 251 press tool battery kit (78148) — RIDGID lists the kit with ProPress jaws from 1/2 to 1 1/4 inch, a 12V battery, a charger and a carrying case. It is the buy for someone who presses copper often; for a single project, rent one (see the FAQ below).
The tools for each side: our press tool guide and plumbing torch guide.
If you are still sweating joints: solder and flux do more for a sound joint than the torch does. Use Oatey 95/5 lead-free solder (not linked: third-party sellers only on 10/4/2026) with Oatey H-20 95 water-soluble tinning flux (30140), which Oatey lists as lead-free, NSF 61 certified and compatible with all common plumbing solder alloys. Oatey’s technical specification sheet says to apply it with a brush, not your fingers.
Related: before giving up on a sweated joint, rule out the usual five causes — why solder will not flow.
Related: the wet-line case is where press wins outright — see can you press a wet line.
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Plumbing Picks is written by Isaac Daniels, a Journeyman Plumber — State of Georgia Licence #JP507711 — verifiable through the Georgia Secretary of State’s license verification portal. Nobody pays to be included and no manufacturer sponsors the site: picks come from field experience on real jobs plus published manufacturer specs and standards. Amazon links earn a commission at no extra cost to you. More on how we pick and who writes this.
Frequently asked questions
Is ProPress as reliable as soldering? Yes, for the vast majority of installs. Press fittings have decades of field history and pass the same codes as soldered joints. The one technical difference is that press relies on an O-ring seal versus solder’s solid-metal bond, but in normal residential and commercial use both are trusted, long-lasting connections.
Are press fittings as good as solder? For potable water in residential and light-commercial work, yes. Both meet code, and press fittings are built to ASME B16.51 at 200 psi and 32–200°F on the same ASTM B88 copper tube you would sweat. The practical difference is not quality, it is which mistakes each method punishes: press punishes a burred cut, solder punishes a wet line.
Is press fitting cheaper than soldering? That depends on the job. Soldering needs a torch, flux and solder; press needs a press tool, bought or rented. Press wins on labor time once the joint count is high enough, and on any job where an open flame is a problem.
Is ProPress cheaper than soldering? It depends on job size. A small job needs only a torch, flux and solder. ProPress needs a press tool, bought or rented, and it wins when the time saved on a high-joint-count job matters — which is why it dominates professional volume work but rarely makes sense for a one-off DIY repair.
Can you press copper pipe that has water in it? You can press on damp or slightly wet pipe, which is a major advantage for repairs. Soldering, by contrast, requires bone-dry pipe because moisture turns to steam and prevents the solder from flowing. For a wet repair you can’t fully drain, press is the clear winner.
Do I have to buy a press tool, or can I rent one? You can rent. Most tool rental counters and big-box stores rent press tools by the day, which is the smart move for a single project. Buy one only if you’ll join copper often, typically through paid work or repeat projects.
Are press fittings code-approved? Yes. Press fittings from major manufacturers are listed to the relevant standards and are accepted by code for potable water, hydronic, and many other applications. As always, confirm with your local inspector for your specific job and jurisdiction.
For the plumbers reading this
Most of this site is written for homeowners — this page clearly isn’t. If you’re in the trade and want the occasional straight-shooting note when I publish something like this (fittings comparisons, tool guides, code changes), drop your email. No spam, no course funnel, written by a licensed GA journeyman.