Can a macerating toilet add a bathroom where the drain line doesn't reach?
A macerating (upflush) toilet has a small pump unit that grinds waste and pushes it out through a narrow pipe, so the toilet doesn't have to sit directly over a main drain. That can make a bathroom possible in a basement, garage, guest suite or addition without cutting into the floor. It is a fixture, not a smart-home device: it needs power, it needs a proper installation, and it needs care. This guide covers when one fits, what it does not remove from your list, and three models from one maker.
Research-based: we used the maker's own manual, spec sheets and product pages and haven't tested these products hands-on. How we research
The job, sorted
| The job | Approach that fits | What still needs you |
|---|---|---|
| Adding a toilet where the drain is too far or too low | Simplify with a macerating toilet | Planning the pipe route, power supply, installation and any permit |
| Installing it | Delegate to a licensed plumber (or confirm your local rules for doing it yourself) | Choosing and supervising the plumber |
| Keeping it working | Keep: it's your routine | Following the maker's list of what may be flushed, and having maintenance done as the manual directs |
| A bathroom that already has a working drain | Skip: a standard toilet is simpler | Nothing new |
- The job
- Adding a toilet where the drain is too far or too low
- Approach that fits
- Simplify with a macerating toilet
- What still needs you
- Planning the pipe route, power supply, installation and any permit
- The job
- Installing it
- Approach that fits
- Delegate to a licensed plumber (or confirm your local rules for doing it yourself)
- What still needs you
- Choosing and supervising the plumber
- The job
- Keeping it working
- Approach that fits
- Keep: it's your routine
- What still needs you
- Following the maker's list of what may be flushed, and having maintenance done as the manual directs
- The job
- A bathroom that already has a working drain
- Approach that fits
- Skip: a standard toilet is simpler
- What still needs you
- Nothing new
Before you buy: six checks
- Is a standard toilet possible? If a plumber can run a normal drain, that may be simpler and has no pump to maintain. Ask for both options.
- Local rules. Plumbing and permit rules differ by place and sometimes limit where these systems may be used. The maker's spec sheets list ASME A112.19.2/CSA B45.1, ASME A112.19.14, EPA WaterSense and California Energy Commission standards. We haven't checked any listing, and your local building department or licensed plumber decides what is accepted where you live.
- Power. The maker lists 110–120V and says to use a grounded outlet with ground-fault (GFCI) protection. Ask your electrician where it will be supplied from. The manual doesn't say what the unit does in a power cut, so plan for one.
- Where does the pipe go? The unit pushes waste through a narrow pipe to your main stack or drain. The maker lists a 29 ft maximum vertical lift and a 295 ft maximum horizontal run, and says the pipe needs a slope of 1/4 inch per foot. Those are maker figures; a plumber should confirm the route works in your house, and the manual says to fit the supplied check valve.
- What may be flushed. The manual says the toilet is designed only for sanitary paper, waste and wastewater, and warns against chemical solvents, strong acids and strong alkalines. Read the manual before first use.
- Space and noise. The maker lists a minimum installation depth for toilet plus pump of 26-2/5 inches for the two-piece model and 30-3/10 inches for the one-piece model. Any pump makes noise when it runs, so think about the room next door.
Three models from one maker
All three are from Simple Project (SNFLEX line), sold through the maker's store. We only list facts from the maker's own documents and pages, and we haven't measured anything ourselves.
Store links for these models aren't available yet.
SNFLEX Two-Piece Macerating Toilet, 600W (MT-1)
What it is. A two-piece toilet with a separate pump unit. Per the maker's spec sheet it has a round bowl, dual flush at 1.28 and 0.8 gallons, a 4-inch inlet for the toilet and three 1½-inch inlets for other fixtures, and a built-in carbon filter, so no vent pipe is required. The maker's manual describes installing the pump behind the toilet or inside the wall.
Good for: a basement or other bathroom where a conventional drain isn't practical.
What still needs you: installation, a GFCI-protected power supply, following the flush list, and maintenance. The manual says maintenance should only be carried out by qualified professionals. If you put the pump inside a wall, it says to leave an access opening.
Skip it if a standard toilet can be connected to your existing drain, or your local rules don't allow this type of system.
SNFLEX One-Piece Macerating Toilet, 600W (MT-4)
What it is. A one-piece toilet with an elongated bowl and a separate pump unit. Per the maker's spec sheet it has dual flush at 1.28 and 0.8 gallons, a 4-inch inlet for the toilet and two 1½-inch inlets for other fixtures, and a built-in carbon filter. The maker lists an optional extension hose to conceal the pump behind a wall, and shows connections for a sink, shower, tub and washing machine.
Good for: a bathroom where you prefer a one-piece bowl and have room for the pump beside or behind it.
What still needs you: the same as above, plus checking the depth. The maker lists a 30-3/10 inch minimum for toilet plus pump.
Skip it if you haven't confirmed the room's space and pipe route, or a standard toilet can reach your drain.
SNFLEX Basement Macerating Toilet System, 4-inlet
What it is. A system sold for adding a full bathroom in a basement, garage, guest suite or home addition, described by the maker as avoiding breaking concrete or relocating drain lines. The maker's page links the MT-1 spec sheet for it, which lists a 4-inch toilet inlet plus three 1½-inch inlets for other fixtures. That is likely what “4-inlet” refers to, but check the exact configuration with the maker.
Good for: a project where you want more than a toilet: for example, a toilet plus a sink and a shower.
What still needs you: a plumber to confirm that the fixtures and pipe runs work together, plus everything in the checks above.
Skip it if you only need a toilet, or your plumber recommends another layout.
Before you buy any of them, check the maker's store for the current return, shipping and warranty terms, and confirm the exact model number on the item you add to your basket.
No purchase needed
- Ask a plumber whether a standard drain can reach the spot. It may cost more up front but leaves no pump to maintain.
- Ask whether a different system, chosen and installed by your plumber, suits your house better.
- Use an existing bathroom, and skip the addition.
What stays with you, whatever you buy
- Deciding whether the project is worth it, and what local rules require
- Hiring and supervising the installation
- Following the maker's manual for use and care
- Having a plan for power cuts and for a unit that stops working
Your next step
Browse household jobs for other chores you could simplify. To see where your own time goes, use the household planner or the time assessment. This guide is not part of the planner yet, and we don't estimate time saved per product.