Toilets by Flushing System

Siphonic Toilets

How it works: Creates a siphon action that pulls waste smoothly with a single flush. (NBH CHOICE)

• Average Water Use: 1.28 – 1.6 GPF (4.8 – 6 liters)

      ✅ Pros

• Very efficient, usually single flush only
• Saves 40–60% more water compared to traditional wash-down toilets
• Quiet and odor-free (trapway stays filled with water)
• Conserves water and energy (less pumping, fewer flushes)
• Prevents embarrassing “multiple flush” situations

❌ Cons

• Installation may cost more than simple wash-down systems

Flush Down (Wash-Down) Toilets

How it works: Waste is forced down directly by water, without siphon action.

• Average Water Use: 1.6 – 3.5 GPF (6 – 13 liters)

✅ Pros

• Larger trapway reduces clogging
• Simpler mechanism
• Cheaper to manufacture and purchase

❌ Cons

• Requires more water per flush (often 2–3 times siphonic)
• May need several flushes → water waste + energy waste (extra pumping at water plants)
• Louder flush, can splash
• Not eco-friendly for high-traffic use

Vortex Siphonic Toilets

How it works: Combines siphonic action with swirling water for superior cleaning. (NBH CHOICE)

• Average Water Use: 1.1 – 1.28 GPF (4 – 4.8 liters)

✅ Pros

• Cleans bowl thoroughly in one flush
• Water-saving and eco-friendly
• Premium, modern design

❌ Cons

• Higher price point

Dual-Flush Toilets

How it works: Two flush buttons — half flush for liquid, full flush for solid.

• Average Water Use: 0.8 GPF (liquid) / 1.6 GPF (solid)

✅ Pros

• Saves more water compared to traditional toilets
• Eco-friendly and cost-effective over time
• Now standard in green buildings

❌ Cons

• Flush buttons/mechanisms can wear faster
• Users sometimes confused → wrong button = wasted water

Pressure-Assisted Toilets

How it works: Uses compressed air + water for a high-powered flush. (NBH CHOICE)

• Average Water Use: 1.1 – 1.6 GPF

✅ Pros

• Extremely powerful, reduces clogging
• Good for commercial restrooms
• Efficient water usage

❌ Cons

• Very noisy
• Expensive to maintain
• Requires strong water pressure supply

Vacuum Toilets

How it works: Creates a vacuum suction (like airplane toilets).

• Average Water Use: 0.3 – 0.5 GPF

✅ Pros

• Uses 80% less water than traditional toilets
• Great for ships, airplanes, trains
• Compact and efficient

❌ Cons

• Complex installation & expensive system
• Not practical for standard homes