Toilet water tanks are crucial components of any toilet system, holding the water necessary for flushing waste and ensuring proper sanitation. They are essential for both new installations and replacements, impacting overall water efficiency and bathroom aesthetics. Products were evaluated based on material durability, flush performance, compatibility with toilet bowls, user reviews, and feature analysis.
American Standard 4188A004.020 Cadet Pro 1.6 GPF Toilet Tank with 12 inch Rough-in, White
$105.30
Offers a robust build with vitreous china and durable metal components, ensuring long-term reliability for general use.
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PROFLO PF6112 Calhoun Toilet Tank Only - Less Seat - White
$65.58
Provides a straightforward gravity-flush system in classic vitreous china, representing a cost-effective replacement or new installation option.
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TOTO Drake 1.28 GPF Toilet Tank with WASHLET+ Auto Flush Compatibility, Cotton White - ST776EA#01
$112.98
Features advanced 1.28 GPF efficiency, WASHLET+ compatibility, and a modern design, catering to users seeking high-end functionality and aesthetics.
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- Fully covered under ProFlo's 1-year limited
- Made from vitreous china for a and classy look
- Tank utilizes the power of gravity to flush
- WaterSense certified - toilet uses 20% less water than the current standard while maintaining performance
- Covered under PROFLO's limited
- Coordinates with products from the Jerrit line
- Tank only configuration - giving you the opportunity to select your matching bowl
- Tank compatible only with PF1400T bowl. Not universal.
- Made of vitreous china
- Toilet seat not included with this product
- Overall Height: 14-1/4" (bottom of the base to the highest point on the fixture)
- Overall Depth: 8-3/8" (furthest points back to front)
- Compatibility: Pair with Cadet 3 FloWise bowl, sold separately
- High-efficiency design: Large 3-in. flush valve is included
- Includes: Chrome-finished trip lever and coupling components
- Conserves water: Uses 1.28 gpf/4.8 Lpf and is WaterSense certified for high efficiency
- Buy with confidence: Limited lifetime warranty on ceramics
- Tank only configuration - giving you the opportunity to select your matching bowl
- Toilet seat not included with this product
- Overall Depth: 6-1/4" (furthest points back to front)
- Flow Rate: 1.28 gallons-per-flush
- Tank Depth: 6-1/4"
- COMPATIBLE TOILET BOWLS: American Standard model numbers 3517F.101, 215AA004, 215BA004, 215CA004, 215FC004 and 215DA004
- DURABLE METAL TRIP LEVER: This American Standard toilet tank includes a metal trip lever
- POWERFUL FLUSH: 3 inch (76 mm) flush valve delivers reliable flushing performance when paired with a Cadet PRO bowl (sold separately), ensuring a complete flush every time
- EASY INSTALL: Includes EZ-Install tool. No additional tools required for installation
- HYGIENIC: The antimicrobial EverClean surface protects your bathroom against mold, mildew, odor and stain-causing bacteria keeping it clean and hygienic
- WARRANTY: Limited lifetime warranty
- QUALITY AND DURABILITY: Vitreous china with metal trip and brass shank fill valve for long-lasting strength and reliability
- POWERWASH RIM: Scrubs the toilet bowl with each flush, providing homeowners and users with a cleaner, more hygienic bowl for every bathroom use, reducing the need for manual cleaning
- ✅ Toilet tank only; bowl sold separately
- ✅ Front-mount chrome-plated plastic Trip lever; Mansfield ballcock valve
- ✅ 1.6 gpf/6.0 lpf
- ✅ Material: vitreous China; smart fasten 3-bolt tank-to-bowl connection
- ✅ For use with 117, 130, 135 and 137 Alto bowls
- Complete with factory installed tank trim, trip lever, tank to bowl gasket, floor bolts, washers, bolts and nuts
- Fits toilet bowl models : 117, 130, 131, 135, 137, 138 and 139NS
- 1.6 Gallons per flush
- Fix noisy, or slow filling fill valves with the quietest, most powerful toilet fill valve available
- Easy to install, step-by-step instructions included
- Universal fit for most toilet models and brands
- Tank and Bowl water level adjustment dials to customize the perfect flush and save. EZ-Twist height adjusts from 9 in. to 14 in. to fit more tanks
- POWERFUL PERFORMANCE - A powerful flush with only 1.28 GPF. WaterSense, CALGreen, and CEC compliant. Wide 3 inch flush valve to quickly move water through the Drake TORNADO FLUSH system.
- STYLISH AND MODERN DESIGN - Update your oasis with this stylish design that couples well with any bathroom décor. The Drake tank features a chrome plated left-hand trip lever.
- COMPLETE YOUR TOILET - Drake tank only. Compatible Drake bowl required. Wax ring, flange bolts, and water supply lines not included. Finish your purchase with the addition of a SoftClose seat or WASHLET bidet seat.
- AUTO FLUSH COMPATIBILTY FOR WHEN YOU ARE READY TO UPGRADE - This tank features an auto flush technology option when paired with the correct WASHLET+ bidet seat.
- Tank only configuration - giving you the opportunity to select your matching bowl
- Built from vitreous china
- Toilet seat not included with this product
- Overall Depth: 8-3/8" (furthest points back to front)
- Flow Rate: 1.28 gallons-per-flush
This article is part of our complete guide Plumbing & Electrical — browse all our comparisons and buying guides.
Last update on 2026-06-08 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Toilet Water Tanks
Flush System and Water Efficiency
The flush system and water efficiency are critical considerations for any toilet water tank. Tanks typically operate at either 1.28 Gallons Per Flush (GPF) or 1.6 GPF. For instance, the TOTO Drake ST776EA#01 offers a powerful 1.28 GPF flush, which is compliant with WaterSense, CALGreen, and CEC standards, making it an excellent choice for water conservation. In contrast, models like the KOHLER K-4468-0 Wellworth operate at 1.6 GPF, providing a robust flush that might be preferred in certain applications. PROFLO's PF6112 Calhoun tank utilizes a gravity-flush system, a reliable and common mechanism, though specific GPF is not always highlighted for such basic systems. Understanding these differences helps in selecting a tank that meets both performance expectations and local water-saving regulations.
Material and Construction Durability
The longevity of a toilet water tank largely depends on its material and construction quality. Vitreous china is the industry standard, known for its smooth, non-porous surface that is easy to clean and resistant to stains and scratches. Both the PROFLO PF6112 Calhoun and the American Standard 4188A004.020 Cadet Pro tanks are made from vitreous china, offering a classic look and inherent durability. Users report that tanks with additional durable components, such as the American Standard model's metal trip and shank fill valve, tend to offer enhanced long-term strength and reliability compared to those with plastic alternatives. Investing in well-constructed materials can minimize future maintenance and replacement costs.
Compatibility and Design Integration
Ensuring proper compatibility between the toilet tank and bowl is paramount, as tanks are often sold separately. American Standard explicitly states that its 4188A004.020 Cadet Pro tank is designed to pair with specific Cadet PRO bowls, while the TOTO Drake ST776EA#01 requires a compatible Drake bowl. Attempting to mix incompatible brands or models can lead to leaks or inefficient flushing. Furthermore, the 'rough-in' measurement, such as the 12-inch rough-in on the American Standard Cadet Pro, dictates the distance from the wall to the center of the drain, which is crucial for proper installation. Aesthetically, tanks like the TOTO Drake ST776EA#01 emphasize a stylish and modern design, suggesting that visual integration with existing bathroom décor is also a factor for many consumers.
Installation Considerations and Included Components
When selecting a toilet water tank, it's important to consider what components are included for installation. While some tanks may come with basic hardware, others, like the TOTO Drake ST776EA#01, explicitly state that a wax ring, flange bolts, and water supply line are sold separately. This means additional purchases are typically necessary to complete the installation. While PROFLO's PF6112 and Kohler's K-4468-0 do not specify included components, it is a common practice for tanks to require separate purchases for these essential items. Planning for these extra parts can prevent delays during installation and ensure the system is sealed correctly and ready for use.
Pros & Cons
PROFLO PF6112 Calhoun Toilet Tank Only - Less Seat - White
Pros
- Features a straightforward gravity flush mechanism, known for reliability.
- Constructed from durable vitreous china for a classic and clean aesthetic.
- Fully covered under ProFlo's 1-year limited warranty, offering peace of mind.
Cons
- Lacks advanced water-saving features like 1.28 GPF compliance.
- Specific bowl compatibility is not detailed, requiring separate research for pairing.
American Standard 4188A004.020 Cadet Pro 1.6 GPF Toilet Tank with 12 inch Rough-in, White
Pros
- Built with quality vitreous china and robust metal trip/shank fill valve for long-lasting strength.
- Designed specifically for Cadet PRO bowls, ensuring optimal compatibility and performance.
- Features a common 12-inch rough-in, providing flexibility for many standard bathroom layouts.
Cons
- Requires pairing with specific Cadet PRO bowls, limiting universal application.
- No explicit mention of advanced water efficiency certifications (e.g., WaterSense) for its 1.6 GPF.
TOTO Drake 1.28 GPF Toilet Tank with WASHLET+ Auto Flush Compatibility, Cotton White - ST776EA#01
Pros
- Achieves powerful flushing with only 1.28 GPF, meeting WaterSense, CALGreen, and CEC compliance.
- Offers WASHLET+ Auto Flush Compatibility for integrated, hands-free operation.
- Presents a stylish and modern design that integrates well with contemporary bathroom décor.
Cons
- A premium product, which typically means a higher initial investment.
- Essential installation components such as wax ring, flange bolts, and water supply line are sold separately.
Common Mistakes to Avoid
Ignoring Rough-in Compatibility
A frequent error is purchasing a toilet tank without verifying the correct rough-in measurement for the existing plumbing. For instance, the American Standard 4188A004.020 Cadet Pro tank specifies a "12-in Rough-in." Failing to match this distance from the wall to the center of the drain can lead to significant installation challenges or necessitate costly plumbing modifications, as the tank will not sit properly against the wall.
Mismatched Tank and Bowl Combinations
Users often overlook the critical requirement for specific tank-to-bowl compatibility. The American Standard 4188A004.020 explicitly notes, "Tank only: Pair with Cadet PRO bowl," and the TOTO Drake ST776EA#01 states, "Compatible Drake bowl required." Attempting to combine a tank with an incompatible bowl, even from the same brand, typically results in improper fit, leaks, or a compromised flushing mechanism, significantly hindering performance.
Overlooking Water Efficiency Standards
Another common mistake involves not considering the tank's water efficiency, particularly in areas with water conservation mandates. While the TOTO Drake ST776EA#01 boasts 1.28 GPF and WaterSense compliance, other tanks like the KOHLER K-4468-0 Wellworth operate at 1.6 GPF. Choosing a higher GPF tank without checking local regulations or personal water usage goals can lead to higher water bills or non-compliance with environmental standards.
Assuming All Installation Hardware is Included
Many consumers incorrectly assume that a new toilet tank comes with all necessary installation hardware. The TOTO Drake ST776EA#01 explicitly warns, "Wax ring, flange bolts, and water supply line sold separately." Neglecting to purchase these additional components beforehand means installation cannot be completed without an extra trip to the store, causing delays and frustration.