In the UK, we’ve been using the "Gravity Flush" for over a century. You pull a lever, a tank of water drops into the bowl and gravity does the rest. It’s simple, but it’s also loud, water-heavy and, occasionally, ineffective.
As we move into 2026, the architectural trend is shifting toward cisternless smart toilets. But without a big tank of water sitting high up to provide gravity, how do they actually get the job done? The answer lies in Precision Jet Flush technology.
Here is the science behind why a "Jet" is a significant upgrade over "Gravity."
1. How the "Vacuum" Effect Works
Unlike a standard toilet that relies on the weight of falling water, a Washloo uses an internal motorised pump. When you trigger the flush, the system doesn't just dump water into the bowl; it fires a high-velocity "jet" of water into a specifically shaped trap-way.
This creates a siphonic vacuum. The water's speed creates a suction effect that literally pulls the contents out of the bowl and through the pipes. It’s faster, more powerful and significantly more hygienic than the "whirlpool" effect of a traditional flush.
2. Using Less, Doing More
One of the biggest benefits of Jet Flush technology is water efficiency. A traditional gravity toilet can use anywhere from 6 to 9 litres per flush. Because a Washloo uses a pressurised jet to create suction, it can achieve a far superior clean using as little as 3.5 to 4 litres.
- The Result: You’re significantly reducing your household water consumption without ever having to "flush twice."
3. The End of the "Rim Grime"
If you look under the rim of a standard toilet, you’ll find the "distribution holes" where water from gravity enters the bowl. These are notorious for trapping limescale and bacteria. Washloo units are rimless. The Jet Flush enters the bowl from a single, high-pressure point and "tornadoes" around the smooth ceramic surface. There are no hidden nooks for grime to hide in, making the toilet "self-scrubbing" every time it flushes.
Frequently Asked Questions
Is a Jet Flush louder than a normal toilet?
Actually, it’s often quieter. While a gravity flush has the long, drawn-out sound of a tank refilling (which can echo through a house at night), a Jet Flush is a short, sharp and controlled pulse of water. Because there is no external cistern refilling, the "recovery time" is silent.
Does a Jet Flush require high mains pressure?
Most Washloo Jet Flush models require a minimum pressure of 0.8 bar to perform at peak. For most modern UK homes, this is standard. If you have a low-pressure, gravity-fed system (like a tank in the loft), we simply recommend installing a small booster pump to ensure you get that "vacuum" effect every time.
What happens if the power goes out?
This is a common concern with electric toilets. Most Washloo models include a 9V battery backup or a manual flush button that allows the jet mechanism to fire even if the mains power is down. You won't be left stranded.
The Verdict: The Gravity Flush belongs to the 20th century. The Jet Flush is the 2026 standard for anybody who values hygiene, water conservation, and a bathroom that stays cleaner for longer.
Ready to see the power of the Jet Flush for yourself? Explore the Washloo All-In-One range and join the siphonic revolution.