Is a 1.6 or 1.28 Toilet Better? Efficiency, Performance, and Recommendations
Deciding between a 1.6 GPF (gallons per flush) and 1.28 GPF toilet involves weighing water savings against flush power. In 2026, with rising water costs and regulations, 1.28 GPF models are generally better for efficiency without sacrificing performance, per EPA guidelines. This AiDi Sanitaryware guide compares them based on expert insights from non-profit sources.
Understanding GPF: 1.6 vs. 1.28
GPF measures water used per flush. 1.6 GPF was the 1990s standard, but 1.28 GPF (high-efficiency) cuts usage by 20%, saving 13,000 gallons yearly per household, according to EPA WaterSense.
Performance Comparison
Use this table for key differences:
| Aspect | 1.6 GPF | 1.28 GPF |
|---|---|---|
| Flush Power | Stronger for solids | Comparable with modern tech (MaP >800g) |
| Water Savings | Moderate | 20%+ reduction; eco-friendly |
| Cost | Lower upfront | Slightly higher; long-term savings |
| Regulations | Allowed but outdated | Meets WaterSense standards |
| Noise/Clogs | Louder, fewer clogs | Quieter; minimal clogs in quality models |
Why 1.28 GPF is Often Better
Per Plumbing Manufacturers International (PMI) and Terry Love forums, 1.28 GPF reduces bills ($100/year savings) and supports sustainability. Advanced siphonic or pressure-assisted systems ensure effective flushes without double-flushing.
When to Choose 1.6 GPF
For low water pressure or heavy use, 1.6 GPF provides reliable power, as noted in non-profit plumbing discussions.
AiDi Sanitaryware's Efficient Recommendations
AiDi offers 1.28 GPF toilets with strong MaP ratings for optimal balance.
View our water-efficient toilet lineup.
Go efficient! Explore AiDi models today
Frequently Asked Questions
Does 1.28 GPF flush well?
Yes, with high MaP scores ensuring performance.
How much water saves 1.28 GPF?
Up to 20% over 1.6 GPF, per EPA.
Is 1.6 GPF outdated?
Not entirely, but 1.28 meets modern eco-standards.
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