Installing a macerating toilet is a practical solution for adding a bathroom in spaces far from the main drain line. However, proper venting is essential to ensure optimal performance and prevent drainage issues. Here's how to vent a macerating toilet the right way.
Understanding the Venting Role in a Macerating Toilet
A macerating (or upflush) toilet uses a pump to send waste upward to the main drain. During this process, it also needs to draw in air to balance pressure and expel air to release odors. That’s why a venting solution is critical for smooth operation and odor control.
Common Venting Options and When to Use Them
1. Dedicated Roof Vent
✔ Best for homes with attic access
✔ Provides strong airflow and long-term reliability
2. Connection to Main Vent Stack
✔ Ideal for locations near existing plumbing stacks
✔ Saves space and materials
3. External Wall Vent
✔ Suitable for rooms without vertical access
✔ Vents air directly outdoors
4. Air Admittance Valve (AAV) (Not usually recommended)
⚠ Allows air in but doesn’t release it
⚠ May be acceptable in temporary setups, but not ideal for long-term use
How to Connect a Vent Pipe: General Steps
Step 1: Confirm the Vent Port Diameter
Most macerating toilets feature a vent port of 1" to 1.5". Always check the product manual.
Step 2: Gather the Right Parts
- Compatible vent pipe (slightly larger in diameter than the vent port)
- Couplers or adapters if needed
- Hose clamps or pipe straps for secure fitting
Step 3: Make the Connection
- Attach the vent pipe to the toilet’s vent port
- Maintain a slight upward slope for airflow
- Keep the pipe as short as possible with minimal bends
- Use proper sealant and clamps to ensure no leakage
✅ Tip: Proper air intake is essential. Poor venting can reduce pump efficiency and drainage performance.
Important Installation Notes
- Always follow the manufacturer’s instructions
- Ensure all connections are secure and airtight
- Comply with local plumbing codes
- When in doubt, consult a licensed plumber
Simplify Installation: Try a Ventless Solution
If connecting a vent pipe is challenging, consider a model like the Simple Project macerating toilet, which features an internal venting system with optional carbon filters. This design allows odor control without any external venting, making it ideal for basements and tight spaces.
Final Thoughts
Venting your macerating toilet correctly ensures better airflow, smoother drainage, and long-term reliability. Whether you opt for a traditional vent connection or a ventless design, always prioritize proper installation for the best results.