What is load class K3? What is worth knowing?

🔎 What does load class K3 mean?

K3 is one of the load classes defined in European standards such as PN-EN 1253 (for floor drains and siphons).

K3 indicates resistance to a load of up to 300 kg (3 kN).
Products classified as K3 must withstand this level of point load without permanent deformation or damage.

This is an important parameter confirming that a given component—such as a siphon, floor drain grate, or drainage cover—can be safely used in domestic and semi-professional environments.

Where are K3-class products used?

K3 is suitable for areas with pedestrian traffic and light carts, but where industrial-level strength is not required. Typical applications include:

• residential and hotel bathrooms
• technical rooms
• utility rooms and laundries
• basements, private garages
• schools, nurseries, medical offices
• sports facilities (e.g. changing rooms)

For areas with vehicle traffic, forklifts, or heavy machinery, higher classes should be used: L15 (1.5 t), M125 (12.5 t), H250 (25 t), and above.

✅ Why choose K3-compliant products?

• Safety – ensures the product can withstand pressure from standing, leaning, or light equipment.
• Compliance – PN-EN 1253 defines requirements for floor drains used inside buildings.
• Manufacturer reliability – certification or declaration of conformity with K3 means the product has been strength-tested.
• Durability – K3 components are made from suitable materials (e.g. plastics, stainless steel, composites) ensuring long service life.

📄 How to check if a product meets K3 class?

Pay attention to:

• Technical description and load class marking (K3)
• Information about compliance with PN-EN 1253
• Availability of a declaration of conformity or product data sheet
• Certificates from independent testing laboratories

Load class K3 is a practical and important parameter for anyone looking for reliable and safe sanitary solutions. If you value comfort, durability, and safety, choose products marked K3 and compliant with PN-EN 1253.

Akces product range includes floor drains meeting this standard (link):

• Axus plus – horizontal outlet fi 50, 360° rotatable, odor trap, stainless steel grate 1.5 mm, 150×150 mm, 11402
• Axus plus – vertical outlet fi 50 mm, odor trap, stainless steel grate 1.5 mm, 150×150 mm, 11403
• Axus plus – horizontal outlet fi 50, 360° rotatable, odor trap, stainless steel grate 1.5 mm, 100×100 mm, 11415
• Axus plus – vertical outlet fi 50, odor trap, stainless steel grate 1.5 mm, 100×100 mm, 11418

The K3 load resistance of our drains has been confirmed by an independent testing laboratory – ITB (link).

Have questions? Contact us—we will be happy to help you choose the best floor drain for your home or business.