How to Identify TOTO Toilet Model – 2022 Guide

How to Identify a TOTO Toilet ModelWhen you demand quality, performance, and water economy, nobody does it better than Toto.

TOTO toilets are already considered top-of-the-line due to quality, reliability, and durability.

Toto manufactures many different models of toilets.

If you’re considering upgrading or replacing your toilet, the following model guide can help you make the best choice. It’s also good to know that the majority of the parts used in TOTO toilets are interchangeable with other Toto toilets.

What are the differences in the flushing systems of TOTO toilets?

TOTO offers numerous flushing options, including the following:


What are the differences in the flushing systems of TOTO toilets - G-MaxThis is the most popular of TOTO toilets flushing systems. The G-Max has a 3” valve for flushing and a completely glazed siphon to handle the disposal of waste. The powerful jet function allows for quick and efficient emptying of the bowl.

The G-Max uses 1.6 gallons of water per flush. Many states have regulations requiring new toilets to use 1.28 gallons per flush or less. This is especially useful for those living in states with water restrictions.


This is the most economical flushing system. It offers the benefits of the G-Max system but only uses 1.28 gallons of water per flush.


It offers an economical, dual-flush option to save water. Each toilet provides the option to use 0.9 gallons of water per flush or 1.6 gallons of water per flush.

Double Cyclone

What are the differences in the flushing systems of TOTO toilets - Double CycloneThe Double Cyclone flushing system uses gravity and centrifugal force to create an economical and efficient flush.

Two nozzles produce a water flow that circles and cleans the bowl during the flush. This system uses 1.28 gallons of water per flush.


The Cyclone is used in luxury NEOREST toilets. It’s similar to the Double Cyclone but uses one powerful nozzle to flush as Neorest toilets don’t have tall tanks. The Cyclone flushes silently and uses from 0.8-1.6 gallons per flush.


The newest addition to TOTO’s lengthy line of flush methods, the Tornado system uses three water jets positioned inside the bowl to provide silent and efficient flushing, making them extremely hygienic.


Step 1

Remove the tank cover and flip over.

Step 2

Look for black lettering. You should see the letters “ST” or “CST” followed by three digits that identify the model. Go to step 3 if you don’t find this.

Step 3

Check inside the toilet tank to locate the model number.

Step 4

Contact Toto ( if you can’t find the model number. This could indicate a manufacturing error.

Identifying Your TOTO Toilet Model Number

Are all TOTO toilets white? Do they come in other colors?

Are all TOTO toilets white. Do they come in other colorsWhile white is the standard color for many toilets, TOTO toilets also include white satin, colonial white, ebony, bone, and beige. Each color has its own model number.

What’s a rough-in, and do I need to know this before choosing a TOTO toilet?

The approximate distance is the distance between the toilet bowls and the wall behind the toilet. Standard size is 12”, but older homes can be 10” or 14”.

Make sure you know the correct dimensions before choosing your toilet. Most TOTO toilets include a 12” inches rough-in, but many Aquia toilets and TOTO Drake may require 10”.

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  1. Karl says:

    The top tank model # is not the bowl #. How do I find the model# of the bowl on my Toto? [That would be easier than going through all my house purchase file.]

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