The best 1.6 GPF toilet tank depends on the bowl it must fit: tanks are not universally interchangeable. The American Standard Cadet Pro is a strong choice for buyers with a listed compatible bowl, while the TOTO Drake suits those with a compatible Drake bowl and interest in WASHLET+ auto-flush compatibility. The PROFLO Jerritt and American Standard Colony 3 are additional tank-only options. Check the model number and rough-in details before buying; the Calhoun listing does not specify its GPF.
| Product | Best suited for | Key detail |
|---|---|---|
| American Standard Cadet Pro | Owners of listed Cadet Pro-compatible bowls | Metal trip lever; 3-inch flush valve |
| TOTO Drake | Owners of a compatible Drake bowl | WASHLET+ auto-flush compatibility |
| American Standard Colony 3 | Buyers seeking a 12-inch rough-in tank | 1.6 GPF; white finish |
| PROFLO Jerritt | Buyers selecting a matching bowl separately | Vitreous china; tank only |
| PROFLO Calhoun | Buyers considering a gravity-flush tank | Confirm GPF and bowl fit before purchase |
American Standard Cadet Pro 1.6 GPF Tank
Best for: Buyers replacing a tank on one of the specifically listed compatible American Standard bowls. This model is a 1.6 GPF tank with a 12-inch rough-in, and the product information names bowl models 3517F.101, 215AA004, 215BA004, 215CA004, 215FC004, and 215DA004.
The tank has a durable metal trip lever and a 3-inch flush valve. American Standard describes its flushing performance in combination with a Cadet PRO bowl, which is sold separately. It is a useful choice when model matching matters and the buyer can verify the bowl number.
Limitation: It is not a complete toilet. The bowl must be compatible and is not included.
TOTO Drake 1.6 GPF Tank
Best for: Buyers who already have or plan to buy a compatible Drake bowl, especially those interested in WASHLET+ auto-flush compatibility. The tank is rated at 1.6 GPF and includes a chrome-plated, left-hand trip lever.
TOTO specifies a 3-inch flush valve and describes the tank as working with its Drake TORNADO FLUSH system. Choose this model when the Drake bowl pairing and the stated WASHLET+ compatibility suit the intended installation.
Limitation: The Drake bowl is required and sold separately. The listing also says wax ring, flange bolts, and water supply lines are not included.
American Standard Colony 3 1.6 GPF Tank
Best for: Buyers looking for a white 1.6 GPF tank identified with a 12-inch rough-in. The product name specifies the Colony 3 series, 1.6 gallons per flush, and a 12-inch rough tank configuration.
This is a tank-only option to consider when those listed specifications align with the existing toilet setup. Before ordering, confirm that the tank model is intended to pair with the exact bowl in the bathroom; the supplied product details do not name compatible bowl model numbers.
Limitation: The product information provided gives few installation or compatibility details, so buyers should verify the tank-to-bowl pairing rather than rely on the series name alone.
PROFLO Jerritt Tank Only
Best for: Buyers who want to select a matching bowl separately. The Jerritt is explicitly described as a tank-only configuration made of vitreous china, giving buyers the option to choose a bowl rather than purchase a complete toilet.
This model is included as a tank-only alternative, but the supplied product details do not state its GPF or name compatible bowl models. It may suit a replacement project only after confirming those details with the product listing or manufacturer.
Limitation: Do not assume it meets a 1.6 GPF requirement based on the information provided. A toilet seat is not included.
PROFLO Calhoun Tank Only
Best for: Buyers researching a white, gravity-flush PROFLO tank. The listed details identify vitreous china construction, gravity-powered flushing, and a one-year limited coverage statement from PROFLO.
This option is less straightforward for a 1.6 GPF search because the supplied features do not specify the flush volume or compatible bowl. Choose it only after checking the full listing for the GPF and matching bowl information.
Limitation: The 1.6 GPF rating and tank-to-bowl fit are not confirmed by the details provided. The product name says “less seat.”
Buying Guide: How to Choose a 1.6 GPF Toilet Tank
Will the tank fit my existing bowl?
Start with the bowl’s manufacturer and model number. Tank dimensions, bolt placement, and flush components can differ even among products from the same brand. Use the manufacturer’s compatibility information, not just the appearance or brand name, to confirm a match. The Cadet Pro listing provides specific bowl numbers; the other listings here provide fewer compatibility details.
Does the rough-in measurement matter?
Rough-in describes the distance from the finished wall to the toilet’s floor drain. The Cadet Pro and Colony 3 product names specify a 12-inch rough-in. Check the toilet installation requirements and existing setup before purchase; a tank listing alone may not establish that the complete toilet will fit the space.
What does 1.6 GPF mean?
GPF means gallons per flush. If a project requires a 1.6 GPF tank, verify that rating in the product specifications. Do not infer it from a brand or series name. In this selection, the Jerritt and Calhoun details provided do not confirm a flush volume.
What else may need to be purchased?
These are tank-only products, not complete toilets. Depending on the model and installation, buyers may need a compatible bowl and separate installation parts. TOTO specifically notes that its listing excludes a wax ring, flange bolts, and water supply lines. Check each product’s included-parts information before ordering.
Frequently Asked Questions
Can I replace only the tank on my toilet?
Yes, if you find a tank confirmed to match the existing bowl. Check the bowl model and the replacement tank’s compatibility details before purchase.
Is a 1.6 GPF tank compatible with any toilet bowl?
No. Flush volume does not make tanks interchangeable. Confirm the exact tank-and-bowl pairing with the manufacturer’s compatibility information.
Which listed tank includes a metal trip lever?
The American Standard Cadet Pro listing specifies a durable metal trip lever. The TOTO Drake listing specifies a chrome-plated, left-hand trip lever.
Are these products complete toilets?
No. The listed products are toilet tanks. A compatible bowl is required for a complete toilet, and some installation components may also be sold separately.