Press vs. Solder Fittings: Which System Is Better?
Press or solder fittings? This question arises in every HVAC company – and it is often discussed more emotionally than the facts warrant. We compare both systems from a professional perspective – costs, speed, lifespan – and show which system is the better choice for which application.
The short answer upfront: both connection technologies are technically mature and provide permanently tight connections when professionally installed. The decision is therefore not about "good or bad", but about the general conditions of the construction site – time pressure, fire protection requirements, tool budget, and team qualification. This guide provides you with the basis for making that decision.
What are press fittings?
Press fittings connect pipes through cold forming pressing. The pipe is inserted into the fitting, and a pressing jaw compresses the connection. An EPDM seal ensures the seal.
In practice, processing always follows the same pattern: cut the pipe at right angles, carefully deburr, mark the insertion depth, push on the fitting, and press with the pressing machine. The machine applies a defined pressing force – the result is reproducible regardless of the installer's daily form and experience. Precisely this process reliability is the main reason why many companies have completely switched to press technology.
However, care is important during preparation: an unburred pipe can damage the seal during insertion, and an unmarked insertion depth remains the most common source of error. Many systems therefore offer a contour where unpressed connections are visibly leaky during the pressure test – so forgotten pressings are immediately noticed.
Advantages of press fittings
- Fast: 5–10 seconds per connection
- No open flame – no fire protection needed
- Reproducible (machine = no errors)
- Also suitable for beginners
- Clean: no solder, no flux
Disadvantages of press fittings
- Material 2–3 times more expensive than solder
- Tool investment: from €1,500
- EPDM seal with approx. 50 years lifespan
The higher material costs quickly become relative in the overall calculation: on construction sites with many connections, the tool investment pays for itself through saved labor time, and the elimination of fire watch and hot work permits also saves organizational effort.
What are solder fittings?
Capillary solder fittings are connected to the pipe with soft or hard solder. For drinking water, only soft solder is permitted (Pb-free according to DVGW W534).
The functional principle is based on capillary action: the narrow gap between the pipe and the fitting automatically draws the molten solder into the connection as soon as the correct working temperature is reached. A cleanly soldered connection is permanently joined, does not require wear parts, and is rightly considered extremely durable – hence its classic status in craftsmanship.
The downside: soldering is manual work in the best and most demanding sense. Temperature control, flux quantity, and cleanliness of the joint surfaces determine the quality, and each of these steps offers room for error. Added to this is the open flame, which becomes an organizational problem on many construction sites – for example, in inhabited renovations or in fire-hazardous areas.
Advantages of solder fittings
- Material 30–50% cheaper
- Proven for over 60 years
- Lifespan 80+ years
- No wear parts (seal)
Disadvantages of solder fittings
- Time-consuming: 2–5 minutes per connection
- Open flame, therefore fire protection mandatory
- Prone to errors (temperature, flux)
- DVGW certificate required for drinking water
- Cleanliness: zinc spheres, flux residues
Press fittings vs. solder fittings in direct comparison
Anyone who objectively compares both systems quickly recognizes the basic pattern: solder wins in terms of pure material price and theoretical lifespan, press wins wherever time, safety, and process quality are important. Since labor costs on German construction sites generally significantly exceed material prices, the overall calculation for larger projects almost always shifts in favor of press technology.
The following table summarizes the most important criteria:
| Criterion | Press | Solder |
|---|---|---|
| Material costs | 2–3 times higher | inexpensive |
| Tool costs | €1,500+ | €50 |
| Time per connection | 5–10 sec. | 2–5 min. |
| Fire protection | not necessary | Hot work permit |
| DVGW certificate | not mandatory | Mandatory (drinking water) |
| Lifespan | approx. 50 years | approx. 80 years |
| Risk of error | minimal (machine) | Operator error possible |
When is which system the right choice?
Clear application recommendations can be derived from the comparison. The number of connections, the environment, and the available tools are decisive:
Pressing recommended for:
- Fast large construction sites
- Renovations in occupied buildings
- Multiple employees
- Confined spaces
- Fire-hazardous areas
Soldering recommended for:
- Small repairs
- Limited tool budget
- Very large quantities of simple connections
- Highly stressed applications (industrial compressed air)
To find out which pipe material is best for drinking water, read the guide Stainless steel vs. copper in drinking water.
Sanha Press Systems at a Glance
If you opt for press technology, the next step is to choose the right system – and here, the combination of material and medium is paramount. Drinking water has different requirements than closed heating circuits or aggressive media, which is why manufacturers clearly separate their system families by application. A look at the Sanha range shows the typical logic:
| Brand | Material | Application |
|---|---|---|
| Sanha NiroSan | Stainless steel | Premium drinking water |
| SANHA-Press | Copper | Standard drinking water |
| Sanha NiroTherm | C-steel | Heating |
| Sanha 3fit-Press | Silicon bronze/PPSU | Aggressive media |
Professional tip: Pay attention to the pressing jaw contour! V-contour (NiroSan, SANHA-Press), M-contour (Geberit Mapress, NiroTherm), TH-contour (3fit-Press). Multi-compatible pressing machines (Klauke, REMS, Novopress) have interchangeable jaws. An incorrect contour can lead to a leaky or mechanically weakened connection despite an apparent pressing – therefore, check the system approval before each use.
You can find suitable systems in our selection of heating pipes and press fittings as well as in the complete range of pipe systems.
Frequently Asked Questions about Press and Solder Fittings
Are press fittings certified for drinking water?
Yes, all manufacturers (Sanha, Viega, Geberit) according to DVGW W534. Look for the DVGW logo on the fitting – it confirms its suitability for drinking water installations.
How long do press fittings last?
50 years manufacturer's warranty. The EPDM seal is the only wear part; the metallic connection itself is designed for the lifespan of the building.
Is a DVGW certificate required for press fittings?
The company must be DVGW-certified. Manufacturer training typically lasts one day and teaches the system-specific processing rules.
Can you mix press and solder?
Yes, using adapters. However, for drinking water, this is not recommended due to galvanic corrosion. You can learn more about water quality in the piping network in the article Drinking Water Hygiene: Avoiding Stagnation and Legionella.
What does a house installation cost?
Press: approx. €1,200 material + 6 h labor. Solder: approx. €700 material + 12 h labor. The labor share reverses the ratio – ultimately, both variants are closer together than the pure material price would suggest.
Conclusion
Press fittings score with speed, safety, and easy processing, while solder fittings impress with low material costs and maximum lifespan. For businesses with regular installation orders, press technology is almost indispensable today – the time savings and the elimination of open flames quickly offset the tool investment. Soldering retains its justification for small repairs and wherever only a few connections are required. In both cases, clean, system-compliant processing remains crucial. You can find everything for your installation in the plumbing range at Wohnungstechnik.de.
