Product Overview
The hansgrohe Metris C Classic Bathroom Sink Faucet, Model 31078831, is engineered for optimal performance and durability in bathroom environments. This single-handle faucet features a polished nickel finish and is designed for ease of use and maintenance.
Key features include:
- Superior Design: German engineering ensures reliable operation.
- Durable Construction: Made from solid brass for a long product life.
- Leak-Free Operation: Equipped with a ceramic cartridge for consistent, leak-free performance.
- Easy Cleaning: Features an anti-limescale silicone aerator that is simple to wipe clean and resists mineral buildup.
- Efficient Water Flow: A low-flow compliant rate of 1.2 GPM with an aerated spray to minimize splashing.
- Secure Handle: The Boltic lever lock prevents the handle from loosening over time.

Image: The hansgrohe Metris C Classic Bathroom Sink Faucet in Polished Nickel, showcasing its elegant design next to a sink.
Setup and Installation
This faucet is designed for single-hole installation but can also be installed over existing 3-hole counter configurations with a separately sold baseplate. Standard 3/8-inch pipe connection hoses are included and pre-attached.
Important Installation Notes:
- It is recommended that a licensed plumber install this product to ensure proper function and compliance.
- Always comply with all local, state, and federal plumbing codes and regulations during installation.

Image: Diagram illustrating key installation dimensions including spout reach (7 1/2 inches), overall height (12 1/4 inches), and flow rate (1.2 GPM). It also details installation for a 1-hole setup with a hole diameter of 1 1/4 inches and 3/8 inch water connection.
Operating Instructions
The hansgrohe Metris C Classic Faucet features a single lever handle for controlling both water flow and temperature. Move the handle to the left or right to adjust temperature, and up or down to control water volume.
- Water Flow: The faucet delivers water at a maximum flow rate of 1.2 Gallons Per Minute (GPM).
- Temperature Control: Adjust the single lever handle to achieve your desired water temperature.
- Aerated Spray: The faucet produces an aerated spray, which helps reduce splashing and provides a comfortable water stream.

Image: Visual representation of key faucet technologies: Ceramic Cartridge for smooth operation, QuickClean for easy limescale removal, AirPower for full water flow with less splashing, ComfortZone for ample space at the sink, and Eco Right for reduced water consumption. Also indicates 4 finishes available.
Maintenance and Care
Regular cleaning and proper care will ensure the longevity and optimal performance of your hansgrohe faucet.
Cleaning the Aerator:
The faucet features a silicone aerator designed for easy cleaning. Mineral deposits and limescale can be quickly wiped away from the flexible silicone nozzles. This "QuickClean" feature helps maintain consistent water flow performance.
General Cleaning:
- Use only mild soap and water for cleaning the faucet's finish.
- Avoid abrasive cleaners, harsh chemicals, or scouring pads, as these can damage the polished nickel finish.
- Wipe the faucet dry with a soft cloth after each use to prevent water spots and mineral buildup.
Troubleshooting
This section addresses common issues you might encounter with your faucet. For more complex problems, please contact customer support.
Reduced Water Flow:
- Check the aerator for mineral buildup. Clean the silicone nozzles by gently rubbing them.
- Ensure water supply valves are fully open.
Leaking Faucet:
- Verify that all connections are securely tightened.
- If leaking persists, the ceramic cartridge may need inspection or replacement. Contact a qualified plumber or customer support.
Loose Handle:
- The Boltic lever lock is designed to prevent loosening. If the handle feels loose, gently check for any visible screws or contact customer support for guidance.
Product Specifications
| Brand | hansgrohe |
| Model Name | hansgrohe Metris C Classic Replacement Easy Clean 1-Handle 1-Hole 12-inch Tall Bathroom Sink Faucet |
| Part Number | 31078831 |
| Recommended Uses | Bathroom |
| Mounting Type | Single-hole |
| Finish Type | Brass |
| Material | Brass |
| Color | Polished Nickel |
| Number of Handles | 1 |
| Included Components | Faucet, Supply Hoses, Pop-up Drain |
| Hole Count | 3 (can be installed in 1-hole with adapter) |
| Special Feature | Leak Resistant |
| Style | Classic |
| Installation Type | Deck Mounted |
| Maximum Flow Rate | 1.5 Gallons Per Minute (GPM) |
| Handle Material | Brass |
| Spout Height | 3.9 Inches |
| Item Weight | 7.28 Pounds |
| Series ID | Metris C Classic |
| Product Dimensions | 9.49 x 2.05 x 12.24 inches |
Warranty Information
Hansgrohe, Inc. provides a limited warranty for its products. The warranty details are as follows:
- Original Consumer Purchaser: Hansgrohe products are warranted to be free from defects in material and workmanship for as long as the original consumer purchaser owns both the product and the home in which it was originally installed.
- Commercial Purchasers: The warranty period is one (1) year from the date of purchase for hansgrohe products.
- Special Finishes: For products in Rubbed Bronze, Matte Black, or Matte White finishes, the warranty period is three (3) years from the date of purchase.
- Non-Transferable: This warranty is non-transferable.
- Unauthorized Sellers: The warranty does not cover hansgrohe products purchased from unauthorized sellers, unless prohibited by law. Authorized sellers can be found on hansgrohe branded websites.
Additional warranty restrictions apply. Please refer to the manufacturer's website for full warranty details.
Customer Support
For any questions, technical assistance, or warranty claims, please contact hansgrohe customer service.
Email: customerservice@hansgrohe.com
For further information, you may also visit the official hansgrohe website.