Best Dual Flush Toilet Tanks and Upgrade Kits for Water-Saving Bathrooms
The best choice depends on whether you need a complete replacement tank or want to convert or repair an existing toilet. The PROFLO Camden is a straightforward tank-only option, while the American Standard H2Option offers two specified flush volumes and requires its matching bowl. The TOTO Aquia IV is designed for its matching bowl and compatible WASHLET+ auto-flush systems. For repairs, the Senshare kit suits many 3-inch two-piece toilets, and the Danco kit converts certain standard toilets to dual flush.
| Product | Best For | Key Consideration |
|---|---|---|
| PROFLO Camden | Tank replacement | Confirm bowl compatibility |
| American Standard H2Option | Two flush-volume choices | H2Option bowl sold separately |
| TOTO Aquia IV | Aquia IV toilet systems | Requires Aquia IV bowl |
| Senshare 3-Inch Kit | Internal tank repair | For compatible two-piece toilets |
| Danco HydroRight | Converting some standard toilets | Check clearance and valve fit |
PROFLO Camden Dual Flush Tank
The PROFLO PF3712DFP Camden is a tank-only replacement with a 1.28 gallons-per-flush rating and a push-button flush. It is best for buyers who want a dual flush tank rather than a full toilet, provided their existing bowl is compatible. The listed product information emphasizes value and performance, but does not specify compatible bowl models.
Why it was selected: It is a dedicated dual flush tank, making it directly relevant to shoppers replacing a tank while retaining a separate bowl. Check before buying: Confirm the tank’s fit with your bowl and verify whether any additional components are needed; the listing identifies this as a tank only.
American Standard H2Option Tank
The H2Option tank offers a light flush using 0.92 gallons and a full flush using 1.28 gallons. Its chrome-plated push button sits on the lid. The product information identifies it as WaterSense certified and specifies a 12-inch rough-in tank. It is best for a buyer seeking clearly stated flush volumes and a tank designed for the H2Option bowl.
Why it was selected: Its two flush settings make water-use choices explicit. Important limitation: The matching H2Option bowl is sold separately, so this tank should not be treated as a universal replacement. Check the toilet configuration and rough-in requirements before ordering.
TOTO Aquia IV Dual Flush Tank
This TOTO Aquia IV tank provides a 1.28-gallon flush and a 0.9-gallon flush, selected with a chrome dual-flush button on the lid. It is best for owners assembling or replacing components in an Aquia IV toilet system. The listing also specifies compatibility with WASHLET+ auto-flush systems.
Why it was selected: It pairs dual-flush operation with stated system-specific compatibility. Important limitation: The tank is intended for use with an Aquia IV bowl, so it is not presented as a universal tank. Confirm bowl and WASHLET+ configuration requirements for your installation.
Senshare 3-Inch Dual Flush Repair Kit
This kit includes a dual flush valve, fill valve, push button, tank-to-bowl gasket, and mounting bolts. Its adjustable overflow tube and fill valve are specified for a range of tank heights. It is best for DIY repairs on compatible 3-inch two-piece toilets when worn internal parts are causing leaks, running, weak flushes, or ghost flushing.
Why it was selected: It combines several tank repair components and provides sizing guidance. Important limitation: It is not compatible with one-piece toilets. The listing specifies flush-valve openings of 3.2 to 3.6 inches and button holes of 1.9 to 2.2 inches; measure before ordering.
Danco HydroRight Dual Flush Kit
The Danco HydroRight kit is designed to convert some standard toilets to dual flush operation. The listed components combine a dual-flush converter and a fill valve. It is best for buyers who want to upgrade an existing toilet rather than replace the entire tank, if the toilet meets the stated fit requirements.
Why it was selected: It offers a conversion approach for toilets that do not already have dual-flush controls. Important limitation: It requires a standard 2-inch flush valve and at least 10 inches of clearance from the top of the valve opening to the inside of the tank lid. It is not compatible with Mansfield toilets.
Buying Guide: How To Choose A Dual Flush Toilet Tank
Do you need a tank or an internal repair kit?
Choose a tank-only product when the tank itself needs replacement and you have confirmed it works with your bowl. Choose a repair kit when the tank is serviceable but internal parts need attention, or when you want to convert a compatible toilet to dual flush. A conversion kit does not replace the tank.
Which flush volumes matter?
Compare the listed gallons per flush rather than assuming all dual-flush models use the same settings. The H2Option offers 0.92- and 1.28-gallon options, while the Aquia IV lists 0.9 and 1.28 gallons. The PROFLO Camden is listed at 1.28 gallons per flush; the supplied product details do not state its separate flush volumes.
How can you check compatibility?
Start with the toilet’s brand and model, then check the bowl-to-tank pairing, valve opening, button-hole diameter, and available lid clearance. For repair kits, compare the product’s measurements with your tank before purchase. Tank-only replacements may be model-specific, so do not assume that matching color or appearance guarantees fit.
What should you consider during installation?
Tank replacement involves matching the tank to the bowl and connecting the necessary hardware. Repair kits may require adjustment of the fill valve, overflow tube, or push-button rod. Follow the product instructions and stop if measurements or component connections do not match your toilet.
Frequently Asked Questions
What is a dual flush toilet tank?
A dual flush tank provides two flush choices, typically a lower-volume option for liquid waste and a higher-volume option for heavier removal. The actual flush volumes vary by model.
Can I replace only the tank?
Yes, if the replacement tank is designed to work with your existing bowl. Check the toilet model and manufacturer’s compatibility information before buying.
Can a repair kit make a standard toilet dual flush?
Some conversion kits are designed to add dual-flush operation to compatible standard toilets. Fit depends on the flush valve, tank clearance, and other product-specific requirements.
Are all dual flush repair kits compatible with one-piece toilets?
No. Compatibility varies. The Senshare kit is specified for compatible 3-inch two-piece toilets and is not compatible with one-piece toilets.
What measurements should I check before ordering?
For a tank, confirm the bowl pairing and installation dimensions. For a repair kit, check flush-valve opening size, button-hole diameter, tank clearance, and whether the toilet is one-piece or two-piece.