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Heating Piping Systems

Oxygen-tight according to DIN 4726 (sauerstoffdicht nach DIN 4726)

Plastics piping systems

Copper or steel pipes have been used predominantly in the past in heating technology. The sector has since learnt to appreciate the benefits of plastic piping systems. Light weight and high flexibility ensure simple and fast laying.

This is why plastic pipes are used mainly when laying underfloor heating in Germany. There are also a variety of systems available for the application as radiator connecting pipes. The following materials are used:

  • Polypropylene (PP)
  • Crosslinked polyethylene (PE-X)
  • Polybutylene (PB)
  • Polyethylene with higher temperature resistance (PE-RT)
  • Chlorinated polyvinyl chloride (PVC-C)
  • Medium density crosslinked polyethylene (PE-MDX)
  • Multilayer piping systems

As oxygen entering the heating system can result in problems with corrosion to the iron parts (heating boiler, radiators) and therefore has a significant impact upon the life of the system, all the plastic pipe systems have to be oxygen-tight according to DIN 4726.


Cofidence is good - DIN-Geprüft is better!

With the accredited and independent certification mark "DIN-Geprüft", DIN CERTCO enables the manufacturer and retailer to convince their customers of the quality of their products and provide the customer with assistance in his purchase decision; as our mark stands world-wide for confidence.

Basis of Testing

The DIN CERTCO certification scheme "Plastic piping and multilayer piping systems for warm water floor heating and radiator connecting systems" is the basis on which the mark is awarded. The scheme is based on the following standards:

  • DIN 4726 "Warm water surface heating systems and radiator connecting systems - Plastics piping systems and multilayer piping systems"
  • DIN EN 15015 "Plastics piping systems - Systems for hot and cold water not intended for human consumption - Performance characteristics for pipes, fittings and their joints"
  • ISO 10508 "Plastics piping systems for hot and cold water installations- Guidance for classification and design"
  • DIN EN ISO 9001 "Quality management systems - Requirements"

As well as on the following mentioned standards specific for material:

Polypropylene pipes (PP)

  • DIN EN ISO 15874 "Plastics piping systems for hot and cold water installations - Polypropylene (PP)" - Parts1, 2, 3 and 5

Crosslinked polyethylene pipes (PE-X)

  • DIN EN ISO 15875 "Plastics piping systems for hot and cold water installations - Crosslinked polyethylene (PE-X)"

Polybutene pipes (PB)

  • DIN EN ISO 15876 Plastics piping systems for hot and cold water installations - Polybutylene (PB)" - Parts 1, 2, 3 and 5

Polyethylene of raised temperature resistance pipes (PE-RT)

  • DIN EN ISO 22391 "Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT)" - Parts 1, 2, 3 and 5

Chlorinated polyvinyl chloride pipes (PVC-C)

  • DIN EN ISO 15877 "Plastics piping systems for hot and cold water installations - Chlorinated poly(vinyl chloride) (PVC-C)"

Crosslinked medium density polyethylene pipes (PE-MDX)

  • DIN 4724 "Plastic piping systems for warm water floor heating systems and radiator pipe connecting - Crosslinked polyethylene of medium density (PE-MDX)"
  • DIN 16894 "Pipes of crosslinked medium density polyethylene (PE-MDX) - General quality requirements and testing"
  • DIN 16895 "Crosslinked medium density polyethylene (PE-MDX) pipes - Dimensions"

Multi-layer composite pipes

  • DIN EN ISO 21003 "Multilayer piping systems for hot and cold water installations inside buildings"
  • DVGW W 542 "Mulitlayer piping systems inside drinking water installations - requirements and testing"

Testing and Assessment

The "DIN-Geprüft" mark is only granted to those piping systems and oxygen barrier materials that are able to prove that they comply with the standards by completing a successful test in a testing laboratory recognised by DIN CERTCO and a subsequent independent assessment.

After a positive assessment, DIN CERTCO issues a certificate that is valid for 5 years. The registration number that clearly identifies the certificate is made up as follows: 3V000 .

Third party surveillance

A half-yearly verification test of the product (pipe and fitting) as well as the factory production control (FPC) of the manufacturer follows. The pipes of certified distributors are only subjected to a reduced testing scope.

FAQ - Frequently Asked Questions

  • Which information needs to be added in each packaging unit?
    • The following information has to be included in each packing unit:

      • smallest permissible bending radii
      • area-related oxygen permeability of ≤ 0.32 mg / (m²·d) at 40 ° C (application class 4) or ≤ 3.60 mg / (m²·d) at 80 ° C (application class 5)
      • Heating water additives, if applicable
      • The pipes must be delivered protected from light. To prevent damage and adverse effects due to UV radiation, the tubes must be stored in the packaging until they are laid. Otherwise, they have to be protected against these influences in other ways. This must be indicated in the product documentation and in the leaflet.

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