Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Eridanus Wall Hung Toilet. Please read this guide thoroughly before beginning any procedures to ensure proper function and longevity of your product.
What's in the Box
The Eridanus Wall Hung Toilet system is shipped in two separate packages and may not arrive at the same time. Please ensure all components are present before installation.

Figure 1: Main components of the Eridanus Wall Hung Toilet system, including the in-wall tank carrier, the toilet bowl, and the dual-flush plate.
Package Contents:
- Wall-Hung Toilet Bowl (ERI-WT421)
- Soft-Close Toilet Seat and Cover
- In-Wall Toilet Tank Carrier System (ERI-WT400)
- Dual-Flush Plate
- Mounting Accessories (including bolts, nuts, and other hardware)
- Installation Guide

Figure 2: Detailed breakdown of all included parts for both the toilet bowl and the in-wall tank carrier system.
Key Features
- Space-Saving Design: Concealed in-wall water tank frees up floor space, making the bathroom appear larger and less cluttered.
- Easy to Clean: Rimless bowl design eliminates areas for dirt accumulation, and the wall-hung design allows for effortless floor cleaning.
- Noise Reduction: Hidden tank and durable soft-closing seat contribute to a quieter bathroom environment.
- Powerful Rimless Dual Flush: Forceful double-jet dual flush technology creates a swirling motion for quick, hushed, and thorough cleanup.
- Adjustable Height: Custom seat height and spacious seating ensure comfort for various users.
- Durable Construction: Made from ceramic with a heavy-duty frame, supporting up to 881 lbs.

Figure 3: Advantages of the Eridanus Wall-Hung Toilet design.
Specifications
| Attribute | Detail |
|---|---|
| Brand | Eridanus |
| Model Number | ERI-WT421 |
| Color | White |
| Material | Ceramic (Toilet), Polypropylene (PP) (Seat) |
| Installation Type | Wall Mounted |
| Shape | D-Shape |
| Item Weight | 43.9 pounds |
| Maximum Weight Capacity | 881 lbs |
| Flush System | Dual-Flush (0.8/1.6 GPF) |
| Tank Carrier Compatibility | Fits 2x6 Studs |
Dimensions:

Figure 4: Detailed dimensions of the ERI-WT421 Wall-Hung Toilet bowl.

Figure 5: Additional technical dimensions for the ERI-WT421 toilet bowl.

Figure 6: Dimensions of the ERI-WT400 In-Wall Toilet Tank Carrier System.
Setup & Installation
Installation of the Eridanus Wall Hung Toilet system requires careful attention to detail and adherence to local plumbing codes. It is highly recommended to consult with or hire a qualified professional for installation.
Key Installation Steps:
- Wall Preparation: Ensure the wall structure is adequate to support the in-wall tank carrier and toilet. The carrier system is designed to fit 2x6 wall studs.
- Carrier Installation: Securely mount the in-wall tank carrier system to the wall studs and floor using the provided mounting accessories. Ensure it is level and at the desired height.
- Plumbing Connections: Connect the water supply and drain lines to the tank carrier. Ensure all connections are watertight.
- Toilet Bowl Mounting: Once the wall is finished, attach the toilet bowl to the mounting studs extending from the tank carrier. Securely tighten the mounting bolts.
- Flush Plate Installation: Install the dual-flush plate onto the front of the wall, aligning it with the flush mechanism.
- Seat Installation: Attach the soft-close seat to the toilet bowl.

Figure 7: Secure installation points for the in-wall tank carrier system (ERI-WT400).

Figure 8: Features of the Eridanus In-Wall Toilet Tank Carrier System.
Installation Video:
For a visual guide on the installation process, please refer to the video below. Note that this video is provided by a customer and may not cover all aspects of professional installation.
Video 1: Customer-provided video demonstrating the unboxing and some aspects of the wall-hung toilet installation. This video highlights the toilet bowl, lid, and installation guide.
Operating Instructions
Flushing:
The Eridanus Wall Hung Toilet features a dual-flush system for water conservation. The flush plate has two buttons:
- Small Button: For liquid waste, providing a 0.8 GPF (Gallons Per Flush) flush.
- Large Button: For solid waste, providing a 1.6 GPF flush.
Press the appropriate button firmly to activate the flush. The rimless bowl design ensures a powerful and thorough swirling action for efficient cleaning.

Figure 9: Illustration of the powerful rimless flush system.
Soft-Close Seat:
The toilet seat is designed with a soft-close mechanism to prevent slamming and reduce noise. Gently push the seat or lid downwards, and it will close slowly and quietly on its own.

Figure 10: Soft-close seat mechanism for quiet operation.
Maintenance
Cleaning the Toilet Bowl:
The rimless design and smooth ceramic surface make cleaning effortless. Use a soft cloth or sponge with a mild, non-abrasive bathroom cleaner. Avoid harsh chemicals or abrasive brushes that could damage the finish.

Figure 11: The wall-hung design allows for easy floor cleaning underneath the toilet.
Quick-Release Seat:
For thorough cleaning, the toilet seat features a quick-release mechanism. Press the buttons located near the hinges to detach the seat from the bowl. This allows for easy access to clean the entire ceramic surface.

Figure 12: Quick-release seat for convenient cleaning.
In-Wall Tank Access:
Access to the in-wall tank components is typically through the flush plate opening. For any internal maintenance or repairs, it is recommended to consult a professional plumber.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Weak Flush | Low water pressure; partial blockage in drain; flush mechanism issue. | Check water supply valve; clear any visible blockages; inspect flush mechanism (professional assistance may be required). |
| Continuous Running Water | Flapper not sealing properly; fill valve issue. | Inspect flapper for debris or wear; adjust or replace fill valve (professional assistance may be required). |
| Toilet Leaking | Loose connections; damaged seals; cracked ceramic. | Tighten connections; replace seals; if ceramic is cracked, replacement is necessary. Contact customer service. |
| Seat is Loose | Mounting bolts are loose. | Tighten the mounting bolts for the seat. |
If you encounter issues not listed here or require further assistance, please contact Eridanus customer support.
Warranty & Support
Eridanus provides comprehensive support for its products:
- Lifetime After-Sales Service: Eridanus toilets come with lifetime after-sales service.
- One-Year Limited Warranty: A one-year limited warranty is provided for the toilet, including the soft-closing toilet seat lid.
- Customer Assistance: Expect a response to messages within 24 hours.
- Returns: 30 days easy returns.
For warranty claims, technical support, or any inquiries, please contact Eridanus customer service through the contact information provided with your purchase or on the official Eridanus website.

Figure 13: Eridanus Premium Support details.





