The Toto Ultramax II Double Cyclone delivers exceptional rinse power while using 1.28 gallons per flush, making this an honest look at its everyday performance and long-term durability. Its seamless, one-piece body removes the common leak points found on two-piece models, but the heavy porcelain makes installation harder for a single person. You’ll learn how the wash system works, the physical clearances needed for standard bathrooms, and the exact maintenance rules required to protect its specialized surface.
Table of Contents
How the Toto Ultramax works
The Toto Ultramax II is a one-piece vitreous china toilet designed for residential bathrooms. It combines an elongated bowl with a universal seating height, serving homeowners who want reliable waste removal without wasting water. A common misconception is that the dual-nozzle rinse needs extra water pressure to clear the bowl. In reality, the gravity-fed mechanism uses two side nozzles to create a centrifugal swirl, sweeping the entire interior with standard household pressure.
The ceramic surface features Toto’s baked-on CeFiONtect glaze. This ultra-smooth barrier stops microscopic debris from clinging to the bowl walls. Water creates a wide sheet across the porcelain, lifting residue quickly so the flush trapway pulls waste away without needing multiple cycles. Because the tank and bowl are fused into a single casting, there are no tank-to-bowl bolts or rubber gaskets that degrade and leak over time. This design saves floor space, simplifies exterior wiping, and keeps the bathroom smelling clean with minimal effort.
The basic method
Installing this one-piece toilet requires careful handling because the porcelain weighs close to 100 pounds. You can complete the job safely by following these steps.
- Turn the water supply valve clockwise until tight, then flush the old fixture to empty the bowl and tank completely.
- Disconnect the flexible supply line from the tank inlet using a small adjustable wrench.
- Unscrew the floor nuts from the closet bolts, lift the old unit straight up, and scrape old wax completely off the floor flange using a 2-inch putty knife.
- Insert two new 5/16-inch brass closet bolts into the floor flange slots, sliding plastic alignment washers over each bolt to hold them vertical.
- Press a standard wax ring firmly onto the bottom outlet horn of the toilet, keeping the ring centered.
- Lift the toilet, align its base holes directly over the two closet bolts, and lower it straight down without tilting.
- Apply steady downward body weight onto the center of the seat area to compress the wax ring until the base rests flat on the floor.
- Place the plastic base washers and metal nuts onto the bolts, tightening each side by half-turns with an open-end wrench until snug.
The single judgment call that separates success from a costly mistake is knowing when to stop tightening the base nuts. Overtightening will snap the porcelain base instantly, which ruins the fixture and can’t be repaired. If the floor flange sits higher than 1/4 inch above the finished floor, don’t force the unit down; call a licensed plumber to reset the drain pipe properly.
Key numbers and settings at a glance
The following technical conditions determine how the fixture fits and functions in your bathroom.
| Situation | What to use | How long | What to watch for |
|---|---|---|---|
| Rough-in space | Standard 12-inch tape measurement | 1 minute check | Distance from bare wall to closet bolt center |
| Closet bolt mounting | Two 5/16-inch brass bolts | 5 minutes to set | Level alignment on the floor flange slots |
| Drain seal | Standard non-wax or wax ring | 2 minutes to seat | Full contact without pinching or sliding sideways |
| Water connection | 1/2-inch compression braided hose | 3 minutes to thread | Hand-tight plus 1/4 turn with a wrench |
| Base stabilizing | Plastic leveling shims | 5 minutes to adjust | Rocking movement before tightening floor nuts |
| Fill valve height | Factory float adjustment screw | 2 minutes to test | Water stopping 1/2 inch below the overflow pipe |
What separates good results from bad ones
A smooth setup comes down to preparation and weight management. Experienced installers never carry the unit by the seat lid or try to guide it onto the bolts blindly.
Proper flange preparation
Before lifting the fixture, clean the drain flange until bare metal or PVC shows. Any leftover ring residue prevents a new seal from bonding. Set two small wooden blocks next to the flange so you can rest the toilet base for a moment to check your grip before the final drop. This protects your fingers and stops the wax ring from squishing out of shape before the toilet touches the floor.
Checking balance and movement
Once the fixture rests on the floor, check for any wobble before touching the mounting nuts. If the bathroom tiles are uneven, slide thin plastic shims underneath the porcelain edges until the base sits dead level. Tightening closet bolts against an unlevel base creates uneven stress that cracks the china over time. Leave the water supply off until you check that the tank lever chain hangs straight with roughly 1/2 inch of slack.
Common problems and quick fixes
When a flush issue develops, standard adjustments will solve the issue quickly.
| What you notice | What it usually means | What to do first |
|---|---|---|
| Water trickles into bowl continuously | Flapper seal is dirty or warped | Wipe flapper edge or replace the 3-inch rubber flapper |
| Weak swirling action in the bowl | Water level in tank is too low | Turn fill valve screw clockwise to raise water line |
| Water leaking around the floor base | Compressed wax ring has failed | Lift toilet and replace seal; check floor for level |
| Tank takes several minutes to fill | Supply valve or fill screen is clogged | Shut water off, unscrew inlet hose, and rinse the filter |
| Handle sticks down after flushing | Trip lever nut inside tank is loose | Turn the brass nut counter-clockwise to loosen or clockwise to tighten. |
Plumbing codes and efficiency standards
Low-flow toilets must meet strict municipal and national water conservation rules. In the United States, federal efficiency regulations limit residential toilet flushes to a maximum of 1.6 gallons per flush. The Toto Ultramax II meets this threshold by consuming 1.28 gallons per cycle.
Because of this low volume, the fixture qualifies for the EPA WaterSense program, which verifies that the unit saves water while clearing real waste loads. If you live in areas with severe drought regulations like California or Georgia, local codes require fixtures that meet or beat this 1.28-gallon limit. Moving drain pipes, cutting subflooring, or relocating rough-in plumbing usually requires a building permit. If your drain line needs modification, hire a licensed plumbing contractor to maintain your home warranty and satisfy local building codes.
Protecting the ceramic finish
Taking care of the specialized ceramic glaze requires gentle cleaning methods. Abrasive powders, stiff bristled brushes, and drop-in tank bleach tablets will slowly strip the CeFiONtect coating. Once that microscopic glaze wears away, the bowl catches waste and stains easily.
Clean the interior surfaces regularly using a mild liquid dish soap or baking soda paired with a soft-bristled nylon toilet brush. Avoid all chemical cleaning blocks placed directly inside the water tank. The concentrated chlorine in those pucks rots the silicone flapper and rubber fill valve seals within months. Look for mineral rings at the water line whenever you notice it. If rings form from hard well water, soak the area with distilled white vinegar for 30 minutes, then wipe it away using a microfiber cloth.
When to use a different approach
This toilet isn’t the right choice for every bathroom layout. If your rough-in distance measures 10 inches or 14 inches from the wall, you must use a Toto Unifit adapter to ensure the model fits correctly.
Homeowners with severe back or shoulder limitations should avoid installing this fixture alone, as lifting a 90-pound porcelain shell requires steady physical balance. Finally, if you need a toilet for a small commercial stall where public users mistreat plumbing parts, heavy-duty commercial pressure-assist models handle extreme abuse far better than residential gravity bowls.
Frequently asked questions
Can I install this toilet on a 10-inch rough-in?
This unit requires a 12-inch rough-in by default, but can be installed on a 10-inch or 14-inch rough-in using a compatible Toto Unifit adapter.
Why does the flush seem so short?
The 1.28-gallon flush completes its cycle in under three seconds by design. The wide three-inch flush valve drops water rapidly, generating instant siphon pull rather than relying on a long, slow drainage cycle.
Is it safe to use blue bleach tablets in the tank?
No, drop-in chemical tablets void the manufacturer warranty on internal parts. The harsh oxidizers degrade the rubber seals and the plastic fill valve housing, causing persistent tank leaks.
How long does the internal flapper last?
The original rubber flapper typically functions for a long period under standard municipal water conditions. High chlorine levels or harsh well minerals will shorten that lifespan, requiring an earlier swap.
What happens if my bathroom floor is uneven?
The porcelain base will rock, breaking the watertight wax seal below the bowl. You must level the base using plastic shims before tightening the mounting nuts to prevent sewer gas leaks.
Does this toilet fit standard bidet seats?
Yes, the elongated bowl matches standard residential bidet seat dimensions. Ensure your bathroom wall has a grounded electrical outlet within three feet of the fixture before buying an electric washlet seat.
Final Thoughts
Investing in this fixture is a smart move for your home’s efficiency and cleanliness. Since it doesn’t require frequent scrubbing, you’ll save plenty of time on weekly chores. Before you head to the store, double-check your bathroom’s rough-in measurement to ensure it’ll fit perfectly in your space.
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