⚠️ RUST DISCLAIMER
Zuhne sinks are engineered from premium 304 or 316 stainless steel—materials renowned for their exceptional resistance to rust and corrosion. We back this quality with a Limited Lifetime Warranty against rust or corrosion caused by material defects.
While our stainless steel is highly durable, certain external factors may cause surface rust marks or discoloration. These are not signs of product failure and do not affect the sink’s structure or performance. In most cases, such marks are superficial and fully removable with proper cleaning.
Common External Causes of Surface Rust Marks
External contaminants can occasionally result in rust-like stains, especially during or shortly after installation. Here are the most common culprits—along with real-world examples:
1. Iron or ferrous particles in the water supply
Common in newly constructed or recently renovated homes where new plumbing systems flush out metal debris
Older buildings with corroding pipes or homes using untreated well water
Rust marks may appear near the drain or in sink corners where water lingers. These typically stop once plumbing lines stabilize.2. Rust-transferring items left on the sink surface
Cast iron cookware or carbon steel knives left sitting wet in the sink overnight
Metal tools, screws, or brackets left by contractors during installation
Tin cans with rusted or sharp metal bottoms
Prolonged contact with moisture can cause rust from these items to transfer onto the sink surface. These marks are cosmetic and easily cleaned.3. Abrasive cleaning tools
Steel wool pads or metal scouring brushes
While these tools may remove tough stains, they also scratch the protective chromium oxide layer of stainless steel. Scratches may trap debris and moisture, increasing the risk of surface staining and reducing luster over time.4. Harsh chemicals not rated for stainless steel
Industrial solvents, paint removers, or caustic drain cleaners
Cleaners containing hydrochloric, sulfuric, or muriatic acid
Such chemicals can corrode the passive protective layer on stainless steel, resulting in recurring or permanent staining if not promptly and thoroughly rinsed.5. Construction debris or airborne metal dust during renovations
Dust from tile cutting, concrete work, or grinding metal fittings
Workers using the sink to rinse tools or mop buckets
This fine debris often settles in corners and edges. If not cleaned off immediately, these particles can cause localized surface rust spots.✅ What’s Covered
If permanent rust or corrosion occurs due to a material defect in the stainless steel itself—not from external contamination, chemical exposure, or misuse—Zuhne will, at our discretion, repair or replace the affected sink under our Limited Lifetime Warranty.
❌ What’s Not Covered
Zuhne is not liable for rust marks, stains, or discoloration caused by:
Improper maintenance or failure to follow care guidelines
Use of harsh chemicals or abrasive materials
Contact with rusting or corrosive external objects
Environmental conditions or construction-related debris
These are considered external issues, not sink defects, and are therefore not covered under warranty. To protect your sink’s finish and preserve your warranty, always follow the Care Instructions provided in your product manual. Keeping the sink clean, dry and free from corrosive materials ensures it will retain its beauty for years to come.
⚠️ SCRATCH DISCLAIMER
Zuhne sinks are crafted from high-grade, scratch-resistant (but not scratch-proof) 304 or 316 stainless steel. Like all stainless steel products, surface scratches may occur over time—especially in busy kitchens where sinks are used as the workhorses they’re meant to be.
Scratches are a cosmetic condition only. They do not affect the durability, hygiene, or structural integrity of the sink, and are not considered defects.
Why Do Scratches Occur?
Even the toughest stainless steel can scratch under certain conditions. Common causes include:
Sliding pots, pans, or sharp utensils across the sink surface
Using abrasive pads or scouring tools
Dropping heavy or metal objects into the basin
Good News: Scratches Naturally Fade
Over time, most surface scratches begin to blend into the brushed grain of the sink, becoming less noticeable with regular use. The sink develops a natural patina, giving it a softer, more uniform appearance.
Care Tips to Minimize Scratches:
Use silicone-coated sink mats or stainless steel bottom grids to protect high-contact areas
Avoid steel wool, wire brushes, or rough scouring pads
Clean with soft cloths and non-abrasive cleaners, always following the direction of the grain
❌ What’s Not Covered
Because scratches are considered normal cosmetic wear, they are not covered under Zuhne’s Limited Lifetime Warranty.
Zuhne sinks are designed to be used and enjoyed—not just admired. They’re built tough, rated top-of-class by thousands of homeowners, and made to withstand real-life kitchen demands.
⚠️ CONDENSATION DISCLAIMER
Zuhne sinks are equipped with industry-leading sound and thermal insulation, designed to minimize temperature transfer and reduce moisture buildup. However, under certain environmental conditions, condensation may still occur. This is a natural physical response—not a product defect.
Why Does Condensation Happen?
Condensation can form when there’s a difference in temperature between the inside and outside of the sink, causing moisture in the surrounding air to condense on the sink’s outer surface or within the cabinet.
Common Situations That May Cause Condensation:
Defrosting frozen food directly on the sink base
– Extended contact with ice, frozen meats, or frozen packaging can chill the sink surface and draw condensation on the underside.
→ To avoid this, use a colander or bowl placed inside the sink to defrost items.Temperature differential inside the cabinet
– On hot days, closed cabinet interiors can heat up while cold tap water or ice lowers the internal sink temperature, leading to condensation underneath.
→ Keeping the cabinet door slightly ajar improves airflow and reduces moisture buildup.Sink installed too close to a gas stove
– Heat radiating from cooking may warm one side of the sink, creating uneven surface temperatures.Exposure to prolonged or direct sunlight
– Sinks placed near windows or in outdoor kitchens may be heated by the sun, contributing to surface temperature imbalance.❌ What’s Not Covered
Condensation is caused by environmental and usage-related factors, not by sink material or construction. For this reason, it is not covered under Zuhne’s Limited Lifetime Warranty.
Zuhne sinks are designed for high-performance kitchens and come equipped with the industry’s best insulation. But like any stainless steel product, condensation is a naturally occurring condition under specific temperature and humidity scenarios.
ℹ️ Note on Exterior Padding & Insulation Marks
Zuhne sinks are reinforced with premium thermal and sound insulation to enhance performance and comfort. While we strive to deliver a flawless finish - even on areas not visible after installation - minor scuffs or marks on the insulation or underside cladding may be present due to handling during installation.
These marks are purely cosmetic and do not affect the sink’s functionality, structure, or lifespan. They are not covered under warranty.
If, however, you notice severely damaged or torn insulation on a new sink straight out of the box (a rare occurrence), please reach out to the Zuhne Support Team for assistance.