What Is a Dual Flush Toilet?

How a Dual Flush Toilet Works

The defining feature of a dual flush toilet is the two flush buttons or handles located on the tank. One button triggers a full flush, which uses 1.6 gallons of water. This is designed for flushing solids. The second button triggers a partial flush, which only uses 0.8-1 gallon of water. This lighter flush is intended for liquid waste only.

When the user presses one of the buttons, the attached flush valve opens and allows water to flow from the tank into the bowl. The full flush valve is larger, allowing more water through at once. The partial flush valve is smaller in diameter. Some models also employ syphons or pressure-assist systems to improve performance.

Benefits of a Dual Flush Toilet

Water conservation – With its two flush settings, a dual flush toilet optimizes water usage by allowing you to flush with the amount needed. Using the lighter half flush for liquids saves significant water compared to a standard 1.6 gpf toilet.

Lower utility bills – The water savings achieved with a dual flush toilet directly translate into lower water and sewer costs on utility bills. Homeowners can achieve 20-60% in water savings compared to older toilets.

High performance – Dual flush toilets employ advanced engineering for optimal flushing power on both settings. The full flush is robust enough to clear waste, while the partial flush prevents clogged pipes.

Easy retrofit for conservation – Converting an existing toilet to dual flush can be done via affordable conversion kits. This allows water savings without replacing the entire fixture.

Quieter operation – Dual flush toilets employ efficient flush valve designs that reduce the noise level compared to less advanced models.

Types of Dual Flush Toilets

There are two main dual flush toilet types available:

Push button dual flush -These models have two buttons located on the tank top or side. One button triggers a full flush, while the other buttons activates the partial flush.

Dual flush handle toilet – Instead of buttons, these models use a handle that slides or pivots to select between the two flushes. Pivoting handles usually have full flush in the vertical position and partial flush when horizontal.

Within these designs there are also hybrids that combine dual flush valves with other features:

• Pressure-assisted dual flush toilets for increased power
• Dual flush toilets with elongated bowl for added comfort
• Dual flush comfort height toilets that are ADA compliant
• Dual flush wall-hung toilets for a sleek look
• Dual flush toilets with integrated bidet functions

Dual Flush Toilet Brands

Many leading toilet manufacturers now offer dual flush models. Some top brands to look for include:

• Toto – Industry pioneer in dual flush and water-efficient toilets. Models like the Toto Drake II combine powerful dual flushing with a quiet, comfortable design.
• Kohler – Offers a range of dual flush toilets covering all budgets and styles. Known for innovations like canister flushing on models like the Kohler Highline.
• American Standard – This trusted brand offers dual flush toilets optimized for performance and water savings. See models like the American Standard Champion 4.
• Woodbridge – Budget-friendly dual flush toilets with modern styling and easy DIY installation. See the Woodbridge B-0960S for example.
• Swiss Madison – Known for affordably priced contemporary dual flush toilets like the Swiss Madison Ivy.

Installing a Dual Flush Toilet

Installing a brand new dual flush toilet is a straightforward process similar to other two-piece toilets. Key steps include:

• Turn off the water supply and flush the toilet to empty the tank.
• Disconnect and remove the old toilet.
• Remove wax from the toilet flange and install new closet bolts.
• Set the new dual flush toilet in place and connect the water supply.
• Seal the base with wax and tighten down the bowl using closet bolts.
• Turn on the water and test for leaks.
• Adjust the flush valves as needed to set the right volumes for each flush setting.

Always follow manufacturer instructions for proper installation and adjustment. For a retrofit, conversion kits allow installing dual flush valves in many existing toilets.

Maintaining a Dual Flush Toilet

Dual flush toilets require similar maintenance to other gravity flush toilets:

• Periodically check the flush valves and refill the reservoir as needed.
• Clean the bowl regularly using a toilet brush and non-abrasive cleaner.
• Use demineralization tablets or regular descaling to prevent mineral buildup.
• Check the flapper seal and replace if worn.
• Adjust or tighten the chain connecting the buttons as needed.

Proper maintenance prevents leaks, clogs, and other problems – ensuring your dual flush toilet continues providing optimal service.

Dual Flush Toilet FAQs

How much water do dual flush toilets save?

On average, dual flush toilets use 30-60% less water than traditional 1.6 gpf toilets. The partial flush uses just 0.8-1 gpf, while the full flush uses 1.28 gpf or less.

Do dual flush toilets work well?

When properly engineered, dual flush toilets offer robust flushing power on both settings. Features like wider flush valves, pressurized tanks, and elongated bowls also boost performance.

Are dual flush toilets worth it?

The water savings and lower utility bills of dual flush toilets make them very worthwhile, especially for families. Their efficient operation also appeals to eco-minded homeowners.

Do dual flush toilets clog easily?

Quality dual flush toilets are designed to prevent clogs. Proper toilet usage and occasional maintenance will also keep your dual flush toilet flushing smoothly for years.

Can you convert a regular toilet to dual flush?

Yes, dual flush conversion kits allow replacing the inner workings of your existing single flush toilet tank with new dual flush components. The cost is much less than buying a whole new dual flush toilet.

Conclusion

A dual flush toilet offers the chance to optimize water usage by only flushing with the water needed. The full flush provides maximum power for solids, while the partial flush saves water for liquid waste. Easy operation via flush buttons or a sliding handle makes selective flushing second nature. With their eco-friendly design and water savings capabilities, dual flush toilets are an upgrade worth considering for any home.