Compliance with UK water regulations is essential for consultants, designers, and architects when specifying and installing waste water heat recovery (WWHR) systems, particularly in new builds and renovation projects.
This article provides a clear and detailed overview of Regulation 4 of the Water Supply (Water Fittings) Regu the various certification schemes available.
What is Regulation 4?
Regulation 4 of the Water Supply (Water Fittings) Regulations 1999 ensures all water fittings used in UK properties meet strict criteria to safeguard public health. It specifically requires fittings and components used in drinking water systems to:
- Prevent contamination
- Avoid waste and misuse of water
- Meet specific standards for quality, safety, and hygiene
Why is Compliance Crucial?
Non-compliance with Regulation 4 can lead to water contamination, health hazards, and costly remedial works. Additionally, the National House Building Council (NHBC) requires adherence to these regulations for warranty and insurance purposes.
Certification Schemes
WRAS, KIWA KUKreg4, and NSF REG4
To demonstrate compliance, several certification bodies are recognised by NHBC:
WRAS (Water Regulations Advisory Scheme)
Focus
UK-specific certification confirming compliance with Regulation 4.
Recognition
Universally accepted within the UK and explicitly recognised by NHBC.
Applications
Ideal for products used in potable water systems.
KIWA (KUKreg4)
Focus
Kiwa’s UK-specific scheme (KUKreg4) is a direct alternative to WRAS.
Recognition
Accepted by NHBC and UK water authorities.
Applications
Suitable for potable water applications.
NSF REG4
Focus
Operated by NSF International, providing robust UK compliance.
Recognition
Recognised by NHBC as equivalent to WRAS and KUKreg4.
Applications
Ideal for international manufacturers needing UK acceptance.
How Do These Certifications Compare?
While each certification has its own branding, WRAS, KUKreg4, and NSF REG4 all demonstrate compliance with the UK’s Regulation 4 requirements. They can be considered different ‘flavours’ or pathways to achieve regulatory acceptance.
| Certification | Recognised by NHBC? | Suitable for Potable Water? | Key Advantages |
|---|---|---|---|
| WRAS | Yes | Yes | Strong UK recognition and familiarity. |
| KIWA (KUKreg4) | Yes | Yes | Flexibility between UK and European markets. |
| NSF REG4 | Yes | Yes | International recognition with UK compliance. |
Selecting the Right Certification
The choice of certification depends on market needs, product range, and target audience. WRAS and KUKreg4 are strong for UK projects, while NSF REG4 suits manufacturers operating internationally.
Zypho’s Commitment to Compliance
At Zypho, compliance is central to our products. All Zypho Waste Water Heat Recovery Systems (WWHRS) are WRAS certified, and our Slim 50 additionally holds NSF REG4 certification. We aim to extend NSF REG4 certification by year-end across our full range.
Conclusion
Understanding Regulation 4 and certification pathways ensures your projects’ safety, quality, and reliability. Zypho remains committed to supporting professionals in navigating these regulations confidently.
For further details or assistance, please get in touch with us directly.
