BRL 5613: Assessment guideline for plastic piping systems with a metal inner layer for radiator connections
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What is BRL 5613?
Assessment guideline BRL 5613 describes the requirements for certification in accordance with the KOMO quality mark for plastic piping systems with a metal inner layer for the transport of hot water in heating installations within buildings. This guideline has been declared binding as of 16 March 2026. The guideline focuses on:
- Safety and reliability of the piping system
- Performance under long term temperature and pressure loads
- Durability and service life of the system
- Quality and consistency of the complete piping system
Certification is system based. This means that pipes, fittings and any protection pipes are assessed both individually and in combination. Only components that are part of a certified system may be supplied with the KOMO quality mark.
Scope
The guideline applies to piping systems for:
- Radiator connections in heating installations
- Distribution of hot water within buildings
The systems are designed for a design pressure of 6, 8 or 10 bar.
The systems must meet a temperature profile in accordance with class 5 of ISO 10508:
- 20 °C for 14 years
- 60 to 80 °C for 35 years
- 90 °C for 1 year
- 100 °C for 100 hours
This corresponds to an expected service life of 50 years.
Systems designed according to class 5 may also be used for class 4 applications, such as underfloor heating systems.
Key requirements
- Reliable joints
- Leak tightness under pressure and vacuum
- Resistance to temperature cycling
- Resistance to pull out forces and separation
- Performance under bending and internal pressure
- Pipe performance
- Long term pressure strength
- Strength of the metal inner layer and weld seam
- Adhesion between layers delamination resistance
- Thermal durability of the outer layer
- Oxygen tightness of the system
- Fittings and components
- Material and strength requirements for plastics and metals
- Pressure resistance and corrosion resistance
- Requirements for sealing elements elastomers
- Compatibility within the system
- Protection pipes if applicable
- Mechanical protection of pipes
- Resistance to compression and impact
- Limited deformation and sufficient recovery
- Material use
- Use of recyclate is not allowed
- Use of rework material is allowed under conditions
- Materials must comply with relevant EN and ISO standards
Certification according to BRL 5613
With certification according to BRL 5613 you receive a KOMO attestation with product certificate for the piping system and or its components. The certification process includes:
- Initial product assessment and type testing
- Evaluation of materials, design and system construction
- Extensive system testing such as pressure, temperature and durability tests
- Periodic inspections and controls
- Assessment of the internal quality control system IQC
This ensures continuous compliance and consistent system quality.
Benefits of certification
A certificate based on BRL 5613:
- Demonstrates that your product is suitable for heating installations
- Provides assurance on performance and service life
- Guarantees system quality instead of individual component quality
- Supports market access and acceptance
- Strengthens confidence among clients and installers