Best Rear-Discharge Toilets for Back-Wall Drain Plumbing
A rear-discharge toilet sends wastewater through an outlet at the back of the bowl into a wall drain, rather than through a floor outlet. The Simple Project 19-inch models are best for buyers who want a taller seat, while the maceratingflo options are better for a lower seat height, elongated bowl, or stated flush features. Check your drain location and measurements before choosing: a rear outlet must match the bathroom’s plumbing.
| Product | Best For | Key Detail |
|---|---|---|
| Simple Project 19-Inch Bowl | Taller seating | Rear-discharge P-trap design |
| Simple Project Rear Outlet With Tank | Buyers with a measured 7.5-inch drain center | 19-inch height |
| maceratingflo Tornado Flush | Elongated comfort and stated water use | 1.28 GPF; 7-inch rough-in |
| MaceratingFlo Rear Outlet With Tank | Renovations and compact spaces | Rear discharge; extra extension pipe included |
| Los Flexi Pressure-Assisted Toilet | Pressure-assisted flushing where a floor outlet fits | Not identified as rear-discharge |
Simple Project 19-Inch Rear-Discharge Toilet
This model is best for buyers who need a higher bowl and a rear outlet. Its listed 19-inch bowl height may make sitting down and standing up easier for some seniors, taller users, and people with mobility challenges. The product information describes a P-trap design intended for rear or wall drain installations.
Choose this if seat height is a priority and your plumbing is configured for rear discharge. The listing says a macerator pump may broaden installation options, but it does not specify the pump requirements. Confirm the drain connection and installation details before purchase; the provided features do not state a drain-center measurement.
Simple Project Rear Outlet Toilet With Tank
This 19-inch model is best for buyers who want a taller toilet and whose wall drain matches its specified measurement. The listing gives the distance from the floor to the center of the rear drain as 7.5 inches. It also describes a P-trap intended to direct wastewater to the drain and form a water seal against sewer odors.
Measure from the finished floor to the center of the wall drain before choosing this toilet. The manufacturer warns that a mismatch may cause unstable installation or poor drainage. Avoid selecting it based on bowl height alone if your drain measurement has not been checked.
maceratingflo Tornado-Flush Rear Outlet Toilet
This is best for buyers who want an elongated bowl, soft-close seat, and specified flush volume in a rear-discharge design. The listing states a 1.28-gallon-per-flush tornado flush, a 3-inch outlet, and a 7-inch rough-in. It also includes a 17.6-inch soft-close seat.
Choose this if those stated dimensions and features fit your bathroom and comfort needs. Its listed seat height is lower than the 19-inch Simple Project options, which may matter to buyers seeking a particularly tall toilet. Confirm the rough-in and extension-pipe requirements with the product installation information before ordering.
MaceratingFlo Rear Outlet Toilet With Tank
This model is best for buyers working with a nonstandard plumbing layout, such as a renovation where a conventional floor outlet is not suitable. The listing highlights rear discharge, a space-efficient design, an advanced flushing mechanism, and an extra extension pipe. It describes the toilet as suitable for compact areas, basements, and older renovations.
Choose it when the rear outlet matches the existing plumbing and the included extension pipe is useful for your setup. The provided features do not give a drain-center measurement, rough-in dimension, or specific gallons-per-flush figure. Verify those details before purchase rather than assuming the toilet will fit every rear-drain installation.
Los Flexi Pressure-Assisted Comfort-Height Toilet
This is a comparison option for buyers focused on flush force and a taller seat, not a confirmed rear-discharge replacement. Its listed features include pressure-assisted flushing, 1.0 GPF, an 18.8-inch seat height, a 2-inch glazed trapway, and a 12-inch rough-in. The product description identifies a two-piece toilet but does not say it has a rear outlet.
Choose it only if a floor-outlet toilet suits your plumbing and pressure-assisted flushing is your priority. If you need wastewater to exit through the wall, avoid treating this as a rear-discharge model without confirming the outlet configuration with the seller.
Buying Guide: How to Choose a Rear-Discharge Toilet
Does your drain exit through the wall?
First identify where the existing toilet connects to the waste pipe. A rear-discharge toilet needs a compatible wall drain; a standard floor-outlet toilet is not automatically interchangeable. If you are replacing a toilet, compare the new model’s outlet position with the existing plumbing before ordering.
Which measurements should you check?
Measure from the finished floor to the center of the rear drain, and compare that figure with the toilet’s installation specifications. Also check the rough-in, outlet diameter, available bathroom space, and any extension-pipe requirements. The Simple Project model with a tank specifically lists a 7.5-inch drain-center distance; the maceratingflo tornado-flush model lists a 7-inch rough-in.
How much seat height do you need?
The listed 19-inch Simple Project models suit buyers prioritizing a taller bowl. The maceratingflo tornado-flush model lists a 17.6-inch seat, while the Los Flexi lists an 18.8-inch seat. Compare the stated measurements carefully, since product descriptions may refer to different parts of the toilet.
What flush features matter?
Compare stated flush type and water use where available. The tornado-flush model lists 1.28 GPF, and the Los Flexi lists pressure-assisted flushing at 1.0 GPF. The other supplied product details do not state a specific GPF figure, so do not assume their water use matches either model.
Frequently Asked Questions
What is a rear-discharge toilet?
It is a toilet that sends wastewater through an outlet at the back of the bowl into a wall drain instead of through a floor outlet.
Can I replace a floor-outlet toilet with a rear-outlet toilet?
Not necessarily. The outlet type and plumbing position must match, and changing the arrangement may require plumbing work.
Why measure the rear drain before buying?
The toilet outlet must align with the wall drain. A mismatch can make installation difficult and may affect drainage.
Is a taller toilet better for everyone?
No. A higher seat may help some people sit and stand more easily, but comfort depends on the user. Compare the listed height with the needs of the household.
Is the Los Flexi model a rear-discharge toilet?
The supplied product information does not identify it as rear-discharge. Confirm its outlet configuration before considering it for a wall-drain installation.