Toilet Tank Replacement: What You Need to Know
Need a toilet tank replacement? We carry 40+ compatible models from top brands (American Standard, Toto, Mansfield, Flushmate). Check your toilet's rough-in size and brand, compare flush types (gravity vs. pressure-assisted), and find your perfect fit. Most replacements install in under an hour with basic tools. Free shipping on orders over $50.
How to Choose the Right Replacement Tank
Selecting the correct toilet tank replacement is critical—a mismatched tank won't fit, won't seal properly, and can cause leaks or poor flushing. Follow these steps to ensure compatibility:
Step 1: Identify Your Toilet's Rough-In Size
The "rough-in" is the distance from the wall to the center of the drain. Most toilets use:
- 12" rough-in (most common in North America)
- 10" rough-in (older homes, compact bathrooms)
- 14" rough-in (less common, specialty models)
How to measure: Measure from the wall behind your toilet to the center of the drain opening. This determines tank height and bolt spacing.
Step 2: Check Your Toilet Brand & Model
Write down your toilet's brand and model number (usually found on the bowl's underside or tank). This ensures you select a tank designed for your specific toilet.
Common brands we carry:
- American Standard (Cadet, Champion, Studio, Yorkville)
- Toto (Drake, Entrada, Promenade)
- Mansfield (Alto, Summit)
- Flushmate (pressure-assisted systems)
Step 3: Verify Flush Handle Placement
Replacement tanks come with handles on the left, right, or center. Check your current setup:
- Left-hand lever – handle on left side
- Right-hand lever – handle on right side
- Center push button – top-mounted button (common in modern tanks)
Mismatched handle placement won't work with your existing plumbing.
Step 4: Choose Your Flush Type
| Flush Type | Best For | Water Usage | Power |
|---|---|---|---|
| Gravity-Fed | Standard homes, quiet operation | 1.28–1.6 GPF | Moderate |
| Pressure-Assisted | Strong flush, low clogs | 1.1–1.6 GPF | High |
| Dual-Flush | Water savings, flexibility | 0.8–1.28 GPF | Adjustable |
Gravity-fed tanks are most common and affordable. Pressure-assisted tanks use compressed air for a more powerful flush (ideal if you have frequent clogs). Dual-flush tanks let you choose between a light flush (liquid waste) and full flush (solid waste), saving water.
Step 5: Check Water Inlet Compatibility
Confirm your tank's water inlet location and type:
- Side inlet – water line enters from the side
- Bottom inlet – water line enters from the bottom
- Dual inlet – flexible for different plumbing setups
Toilet Tank Replacement by Brand
American Standard Tanks
American Standard dominates the North American market with reliable, durable tanks. Popular models:
- Cadet 3 – Budget-friendly, gravity-fed, 12" rough-in
- Cadet Pro – Right-height design, elongated bowl compatibility
- Champion Pro – Powerful flush, 1.28 GPF, excellent for clogs
- Studio – Modern aesthetic, dual-flush options
- Yorkville VorMax – Premium performance, swirl-flush technology
Why choose American Standard? Proven reliability, wide compatibility, affordable pricing, and excellent customer support.
Toto Tanks
Toto specializes in high-efficiency, premium tanks with advanced flushing technology.
- Drake II – High-efficiency, 1.28 GPF, elongated design
- Entrada – Compact, space-saving, 12" rough-in
- Promenade II – Elegant design, reliable performance
- Duofit – In-wall tank for wall-mount toilets (specialty)
Why choose Toto? Superior water efficiency, innovative flush technology, premium finishes, and long-lasting durability.
Mansfield Tanks
Mansfield offers budget-friendly, no-frills replacement tanks perfect for DIY repairs.
- Alto – Affordable, gravity-fed, multiple rough-in options
- Summit – Standard performance, 1.6 GPF
- High-Efficiency Alto – Water-saving option
Why choose Mansfield? Lowest price point, easy installation, good for rental properties or quick fixes.
Flushmate Pressure-Assisted Tanks
For maximum flushing power and water efficiency.
- M-101526 Series – Pressure-assist vessel, 1.6 GPF
- Compatible with most OEM tanks – Retrofit option for existing toilets
Why choose Flushmate? Strongest flush available, prevents clogs, compact design, excellent for commercial or high-use bathrooms.
Installation & Compatibility Guide
Tools You'll Need
- Adjustable wrench
- Screwdriver (flathead & Phillips)
- Bucket (for water spillage)
- Towels or rags
- Plumber's putty (optional, for sealing)
Step-by-Step Installation (30–60 minutes)
- Turn off water supply – Locate the shut-off valve behind your toilet and turn clockwise until tight.
- Drain the tank – Flush to empty the tank, then use a sponge to remove remaining water.
- Disconnect water inlet – Unscrew the water supply line from the bottom of the tank using an adjustable wrench.
- Remove bolts – Unscrew the bolts connecting the tank to the bowl (usually 2–3 bolts on the underside). Keep these bolts—you may reuse them.
- Lift off old tank – Carefully lift the old tank away from the bowl. It's heavy—get help if needed.
- Clean the bowl – Wipe the bowl's top surface to remove old wax ring residue.
- Install new tank – Place the new tank onto the bowl, aligning bolt holes. Insert new bolts and tighten evenly (don't over-tighten—this can crack the porcelain).
- Reconnect water supply – Screw the water inlet line back onto the new tank's fill valve.
- Turn on water – Slowly open the shut-off valve and check for leaks around the bolts and water inlet.
- Test flush – Flush several times to ensure proper operation and water level.
Common Installation Issues
| Problem | Cause | Solution |
|---|---|---|
| Water leaks from bolts | Over-tightened bolts or cracked porcelain | Loosen bolts slightly; replace tank if cracked |
| Tank won't fill | Clogged fill valve or kinked water line | Clean fill valve or straighten water line |
| Weak flush | Low water level in tank | Adjust fill valve float to raise water level |
| Tank rocks side-to-side | Loose bolts or uneven bowl surface | Tighten bolts evenly; check bowl for damage |
Types of Toilet Tanks
One-Piece vs. Two-Piece Tanks
One-Piece Tanks:
- Tank and bowl are fused together
- Sleek, modern appearance
- Easier to clean (no crevices)
- Cannot replace tank alone—must replace entire toilet
- More expensive upfront
Two-Piece Tanks:
- Tank bolts onto separate bowl
- Traditional design
- Can replace tank without replacing bowl (cost-effective)
- More common in existing homes
- Easier to repair and maintain
Our recommendation: If your bowl is in good condition, a two-piece tank replacement saves money and time.
Flush Mechanisms & Performance
Gravity-Fed Flush (Most Common)
Water flows from the tank into the bowl via gravity. A flapper valve opens, allowing water to rush down and create a siphon that pulls waste away.
Pros: Quiet, reliable, affordable, simple mechanics Cons: Moderate flushing power, may require double-flushing for solid waste
Pressure-Assisted Flush
Compressed air in the tank forces water down with greater velocity, creating a more powerful flush.
Pros: Strongest flush, prevents clogs, water-efficient, compact Cons: Louder operation, more complex mechanics, higher cost
Dual-Flush System
Two buttons or levers: one for light flush (liquid waste, 0.8 GPF) and one for full flush (solid waste, 1.28 GPF).
Pros: Water savings (up to 30%), eco-friendly, flexible Cons: Slightly more complex, requires user awareness
Maintenance & Repair Tips
Extend Your Tank's Lifespan
Monthly:
- Check for visible leaks around bolts and water inlet
- Listen for running water (sign of a leaking flapper)
- Inspect the water level (should be 1 inch below overflow tube)
Quarterly:
- Clean the tank interior with a brush (remove mineral deposits)
- Check the fill valve for smooth operation
- Inspect the flapper for wear or deterioration
Annually:
- Replace the flapper if it's cracked, warped, or doesn't seal properly
- Inspect bolts for corrosion; replace if necessary
- Test the flush handle for smooth operation
Common Tank Problems & Solutions
| Problem | Cause | Fix |
|---|---|---|
| Running toilet | Worn flapper or fill valve | Replace flapper ($5–15) or fill valve ($20–40) |
| Slow fill | Clogged fill valve or water line | Clean fill valve or check water pressure |
| Condensation on tank | Temperature difference between tank and room | Install tank insulation kit ($15–30) |
| Cracks in porcelain | Impact damage or age | Replace tank (cannot be repaired) |
| Discolored water | Mineral deposits or rust | Flush tank, clean fill valve, consider water softener |
Why Choose Riverbend Home for Toilet Tank Replacement
- 40+ Compatible Models – American Standard, Toto, Mansfield, Flushmate, and more
- Expert Guidance – Our team helps you find the perfect fit for your toilet
- Competitive Pricing – Save up to 45% vs. retail
- Fast Shipping – Most orders ship within 1–2 business days
- U.S.-Based Support – Call 855.438.8585 (M–F, 9am–5pm ET)
- Easy Returns – 30-day return policy, no questions asked
Frequently Asked Questions: Toilet Tank Replacement
Can I replace just the toilet tank instead of the entire toilet?
Yes! If your bowl is in good condition, replacing just the tank is a cost-effective solution. Two-piece toilets are designed for this. One-piece toilets require full replacement.
How do I know which toilet tank is compatible with my toilet?
Check your toilet's brand, model number, rough-in size (12", 10", or 14"), and handle placement. Our product pages include compatibility information, or call our team at 855.438.8585 for personalized help.
What's the difference between one-piece and two-piece toilet tanks?
One-piece tanks are fused to the bowl (modern, sleek, cannot be replaced separately). Two-piece tanks bolt onto a separate bowl (traditional, repairable, replaceable). Most homes have two-piece toilets.
How long does a toilet tank last?
A well-maintained tank lasts 10–15 years. The flapper (internal rubber seal) typically needs replacement every 5–7 years. Regular maintenance extends lifespan significantly.
What's the cost of a toilet tank replacement?
Budget-friendly tanks start at $70–$100 (Mansfield). Mid-range tanks cost $100–$200 (American Standard, Toto). Premium tanks run $200–$700+ (high-efficiency, specialty models). Installation typically costs $150–$300 if hiring a plumber.
Can I install a toilet tank myself?
Yes! Most two-piece tank replacements take 30–60 minutes with basic tools. No special plumbing skills required. Follow our step-by-step guide above, or watch installation videos on our website.
What's the difference between gravity-fed and pressure-assisted tanks?
Gravity-fed tanks use water weight for flushing (quiet, affordable, standard). Pressure-assisted tanks use compressed air for a more powerful flush (louder, stronger, prevents clogs). Choose based on your needs and budget.
What if my tank is leaking?
Check if the leak is from the bolts (tighten them), the water inlet (replace the fill valve), or the flapper (replace the flapper). If the porcelain is cracked, the tank must be replaced. See our troubleshooting table above.
How do I measure my toilet's rough-in size?
Measure from the wall behind your toilet to the center of the drain opening. Most North American toilets use 12" rough-in. Write this down before shopping.
Summary
Toilet tank replacement is an affordable, DIY-friendly way to restore bathroom functionality. With 40+ compatible models from trusted brands, proper measurement (rough-in size + brand), and our step-by-step installation guide, you can save hundreds vs. full toilet replacement.
Choose your tank type (gravity-fed for affordability, pressure-assisted for power, dual-flush for water savings), verify compatibility, and enjoy reliable flushing for years to come. Questions? Call our U.S.-based team at 855.438.8585.