KUKG3 Unvented Water Heater Testing & Certification
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What is KUKG3
Understanding KUKG3 Testing and Certification
KUKG3 is Kiwa Watertec’s certification for unvented water heaters, designed to help manufacturers demonstrate compliance with UK Building Regulation G3—a legal requirement for marketing and installing these products in the UK.
We offer two levels of conformity:
- Level 3 - Product testing and certification
- Level 1+ - Product testing, certification, and annual surveillance
Our in-house testing covers:
- Mechanical and safety performance to BS EN 12897
- Pressure and temperature resistance
- Overpressure protection and operational safety
Why Choose Kiwa Watertec
Trusted by Manufacturers Worldwide
Technical Competence
ISO/IEC 17025 accredited testingSpecialist Expertise
Dedicated scheme for unvented water heaters (KUKG3)Rapid Turnaround
Fast, reliable testing in-house or at your siteExpert Support
Technical guidance and account managementFlexible Solutions
Combined testing for other water product standards (e.g., KUKreg4, BS 6920)Industry Recognition
Trusted by specifiers, distributors and regulatory authoritiesOur Testing Process
How KUKG3 Works
Product Review
Accredited Testing
Certification Decision
Certification Granted
Ongoing Assurance
Business Benefits
Why KUKG3 Certification Matters
Compliance:
Market Access:
Speed:
Trust:
Efficiency:
Recognition & Visibility:
Cost Control:
Supporting the Water Heating Industry
• Unvented water heater manufacturers
• Plumbing and heating system suppliers
• Distributors and importers of water heaters
• Specifiers and compliance consultants
• International manufacturers entering the UK market
Standards & Regulations We Work To
Our KUKG3 testing and certification services are delivered in line with the most recognised safety and regulatory frameworks:
UK Building Regulation G3
BS EN 12897
BS 6920
Frequently Asked Questions
Q: Is KUKG3 testing UKAS-accredited, and where is the testing carried out?
A: Yes. All testing is conducted and controlled within Kiwa Watertec’s laboratories, which are ISO/IEC 17025 accredited by UKAS and RVA.
Q: What types of products can be certified?
A: Unvented water heaters designed for the UK market, including both production and prototype models.
Q: Is KUKG3 recognised internationally?
A: KUKG3 is recognised by UK authorities and widely accepted by specifiers and distributors.
Q: Can I combine KUKG3 with other Kiwa certifications?
A: Yes. We offer bundled testing for KUKreg4, BS 6920, and other Kiwa schemes to save time and cost.
Q: How quickly can I get certified?
A: Our streamlined process enables fast turnaround, with direct access to our in-house testing and certification team.
Pressure Tested. Market Ready. Get KUKG3 Approved.
Partner with Kiwa Watertec to ensure your unvented water heaters meet the highest standards for safety and compliance.