Toto Supreme II vs. Ultramax II Toilets: Similarities and Differences

Last Updated on November 8, 2026

If you’re looking for the best Toto toilet, the Toto Supreme II vs. UltraMax II decision comes down to fit. The Supreme II has a lower tank for bathrooms with a shelf or cabinet above the toilet. The UltraMax II has a slightly narrower body. Both Cotton White models below use 1.28 gallons per flush and have the same seat height.

If you’re also weighing a two-piece design, see the differences between Toto UltraMax II and Drake II.

Toto Supreme II vs. UltraMax II at a Glance

Toto Supreme II Toilet: Quick Facts

• The low-profile tank measures 25⅝ inches high. It suits a space with limited height above the toilet.
• The WaterSense-certified 1.28-gallon flush uses 20% less water per flush than regular flushing toilets rated at 1.6 GPF.
• It’s an elongated one-piece toilet with an included SoftClose seat and no exterior tank-to-bowl seam.
• The Cotton White MS634114CEFG#01 has CEFIONTECT glaze. TOTO also lists a Supreme II variant without the glaze.

Toto UltraMax II Toilet: Short Overview

• The tank stands 28¾ inches high, and the fixture is 16⅝ inches wide at its widest point.
• The elongated SoftClose seat brings the height to 17¼ inches above the floor.
• The MS604114CEFG#01 uses 1.28 gallons per flush. Its CEFIONTECT finish helps keep residue from sticking to the bowl.

What are the similarities between Supreme II and Ultramax II toilets?

• Water use. Both are WaterSense-certified, single-flush toilets.
• Trip lever. The models compared here come with a chrome lever.
• Elongated bowl. Both extend about 28⅜ inches front to back. Check how much room the door has to swing past the bowl.
• Cleaning. Both one-piece bodies eliminate the exterior seam between a separate tank and bowl.

Toto Supreme II vs. UltraMax II: Detailed Toilet Comparison

Anyone who considers several aspects of a toilet before buying should start by measuring the space. Here’s where these two models differ.

Compare Flushing System

TOTO specifies Tornado Flush for both model numbers. The two toilets also have the same rated flush volume and a 2⅛-inch trapway. Those specifications give you no reason to expect a stronger flush from either model.

Height and Size

The Supreme II’s tank is 3⅛ inches lower. Both seats are the same height and both bowls project about the same distance. If the concern is a tight aisle or door swing, compare the full footprint. Leave enough space above the tank to lift off the lid for service.

Price Comparison

Compare the exact model and finish when pricing either toilet. Factor in delivery and the cost of a new seal and supply line if the installer needs them. Both models already include a seat.

Recommendation: Toto UltraMax II or Supreme II?

Choose the Supreme II if a shelf, countertop overhang or window ledge limits tank height. Choose the UltraMax II if you have vertical clearance and the narrower body fits your layout better. If both fit, compare the total installed price.

Frequently Asked Questions

Can both models replace a toilet with a 12-inch rough-in?

Both are designed for a nominal 12-inch rough-in. Measure from the finished wall, excluding the baseboard, to the center of the flange or floor bolts. Use the toilet fit checker to account for door and side clearance.

Does the Supreme II sit lower than the UltraMax II?

The tank sits lower. With their included seats, both models measure 17¼ inches from the floor to the seat.

Is the standard SoftClose seat a WASHLET?

The included SoftClose seat lowers gently. If you want bidet functions, compare compatible WASHLET seats or packages and allow space for the hose and power connection.