Eco-friendly Faucets & Float Settings: How They Reduce Water Waste Every Time

In the bathroom, the shower and sink usually get the most attention when we talk about saving water. But the toilet is used many times a day, and every flush carries a fixed volume of water. That makes the cistern one of the most important points for reducing consumption.

The difference between an old and a modern cistern can be big. Older sinks and cisterns could use many more liters per flush than today's systems. In the US, the EPA reports that toilets are among the main consumers of water in the home, and WaterSense efficient models use up to 1.28 gallons per flush, which is about 4.8 liters, aiming for lower consumption without loss of efficiency.

In the European market, 3/6 liter dual flow systems are particularly popular. The logic is that not every use needs the same amount of water. For liquid waste, the small flow is usually sufficient. For solids, the big one is used. So the savings are made without drastically changing the user experience.

A simple example shows the difference: if a family makes 20 uses a day and 12 of them can be done with a small flow of 3 liters instead of a full 6 liters, 36 liters are saved per day just from this difference. In a month, this is more than 1 cubic meter of water, not counting possible leaks or excessive settings.

The dual flow mechanism is the system that allows the cistern to have two different amounts of flushing. Usually the user sees a button with two parts: a small button for small flow and a large button for full flow. In built-in cisterns, the operation is done through the control panel. In external cisterns, it is done through the mechanism on the lid.

Low flow is often set at around 3 liters and high flow at 6 litres. This relationship is not accidental. It is meant to cover the two main flushing needs with two different water volumes. The important point is that the toilet bowl must be compatible with those quantities. It is not enough to change the mechanism if the old bowl needs more water to flush properly.

A good dual flow mechanism should be reliable, close properly, not allow water to pass into the basin, be properly adjusted and have spare parts. In cheap or poor-quality mechanisms, problems can occur: the small button does not empty enough, the large one sticks, the seal does not close properly, or the cistern continues to run quietly.

Savings, then, do not depend only on having two buttons. It depends on whether the mechanism is properly adjusted and whether the basin flushes effectively with the quantities selected.

The float, or floater, is the mechanism for filling the cistern. His job is to fill the cistern with water and stop when the level reaches the correct height. If the float is set too high, the cistern fills with more water than necessary. If it is set too low, it may not provide enough water for a proper flush.

In older mechanisms, the float was often a ball on an arm. In newer ones, it's usually a solid plastic mechanism with height adjustment and a screw or clip. The principle remains the same: it regulates the fill level.

Poor setup can lead to waste without the owner realizing it. If the level is too high, water can pass through the overflow and quietly drain into the basin. If the fill valve does not close properly, the cistern continues to fill and leak. These small leaks can use up several liters a day.

A practical sign is sound. If you hear the cistern filling for a few seconds without being used, there is a possible leak. If you see a small flow of water in the basin, even if it is almost invisible, the cistern is leaking. This loss can cancel out all the savings an ecological mechanism gives.

Rimless basins do not have the classic inner rim under which the water circulates. In the old basins, the water ran under the rim and out through small holes around the basin. This helped distribute the flow, but created hidden spots where salt, dirt and germs collected.

In rimless basins, water is distributed in a different way, often through specially designed directional flow. The advantage is that the basin is easier to clean, because there is no hidden lip. The places where dirt accumulates are reduced and daily hygiene becomes simpler.

This does not mean that every rimless basin will flush perfectly with any faucet. Basin design and water quantity/rate must work together. A good rimless basin with a proper cistern can give a clean flush with a smaller amount. A bad or incorrectly combined solution may splatter, not clean evenly, or require a second press.

A practical point: if you intend to reduce the large flow from 6 to 4.5 liters, you need to be sure that the toilet bowl is designed for this amount. It is not enough that the cistern allows it. The toilet bowl must also support it.

Rimless technology is often associated with hygiene and ease of cleaning, not exclusively with water conservation. Savings occur when the design of the basin allows efficient flushing with a smaller amount of water and when the cistern is properly adjusted.

In a well-designed rimless basin, the flow is directed more efficiently. This can help the small or large flush work properly without overdoing it. But the word "rimless" is not a guarantee of savings. There are good and mediocre products, as in every category.

Also, rimless basins may have different splash behavior. If the flow is too strong or the faucet is not properly adjusted, unwanted splashing may occur. This is usually solved by choosing the right basin, the right cistern and the right flow setting.

For the owner, the practical guideline is not to choose a basin just because it says rimless. He needs to check if it is compatible with 3/6 or 4.5/3 liters, if it has a good flush rating and if it fits the cistern that will go in.

The external cisterns have easy access, because the lid opens and the mechanism is visible. Adjusting a float, changing a seal or replacing a mechanism is usually simpler. On the other hand, they look more aesthetically pleasing and do not always suit modern renovations.

Built-in cisterns are hidden in the wall and give a cleaner result, especially with wall-hung toilet bowls. Access is through the flush plate. That means the mechanism must be good quality, properly adjusted, and supported with spare parts. If an unknown or very cheap system is chosen, future maintenance may become difficult.

In terms of savings, both solutions can be efficient if they have the right mechanism. Built-in is not in itself more ecological. The exterior is not itself more wasteful. Savings depend on flow, setup, basin and maintenance.

A big advantage of quality built-in systems is that they often have precise settings for low and high flow. But this is only of value if the installer sets them up correctly and the owner knows how to check for leaks.

The right savings starts with measuring the real need. If the cistern already works properly and gives 3/6 liter, the big savings can be found in the use of the small button and maintenance. But if the cistern is old, pours a lot of water or leaks, then there is a lot of room for improvement.

The first step is to check for leaks. Then the float level is checked. Then it is checked if the double flow mechanism is working properly. Finally, it is evaluated whether the basin flushes well with the existing quantities.

If everything works, a small reduction in level or high/low flow adjustment can be made where the mechanism allows. But every change must be tested. If it often takes two taps after setting, the savings have been lost. If the basin does not clean properly, the setting is incorrect.

A practical example: an owner lowers the water level to "save water". The longer flush is no longer enough, so users flush twice. In theory they went from 6 liters to 4.5, but in practice they are using 9 liters. That is false economy.

In many cases, only the cistern mechanism can be changed to a double flow mechanism. This can be an economical solution when the cistern and basin are in good condition. But it doesn't always work perfectly in very old basins designed for a larger amount of water.

If the old basin needs 9 liters to flush well, a 3/6 mechanism may result in a poor flush. A second press may be needed or drainage problems may arise. In this case, the correct solution may be to replace the basin and cistern together, not just the mechanism.

On the other hand, if the basin is relatively modern and the problem is simply an old mechanism, replacement can be very cost-effective. A good dual flow mechanism, properly adjusted, can reduce consumption without much work.

The plumber must assess compatibility. It is not enough that the mechanism fits mechanically. It must functionally match the toilet bowl.

Water conservation should not be confused with poor operation. If the cistern fills too slowly, there may be a clogged filter in the fill valve, low pressure, scale, a half-closed valve, or a problem with the mechanism. If it makes a loud noise, there may be high pressure, a worn mechanism, or poor fill flow.

The float setting doesn't solve all of that. If the fill valve is worn, it needs cleaning or replacement. If the pressure is too high, a pressure reducer may be needed in the installation. If scale is present, the mechanism may not close properly.

A common mistake is to set the float lower to stop the noise. If the noise is due to pressure or wear, the lower level just temporarily hides the issue and may spoil the flush.

Proper saving requires a mechanism that operates quietly, fills correctly, closes completely and does not leak.

In the Greek market of 2026, a simple dual-flow mechanism for an outdoor cistern can start at around €15–35, while better mechanisms, branded spare parts or systems with more precise settings can range from around €35–80. Plumbing work to replace a mechanism depends on access, the condition of the cistern, the salts and whether the fill valve needs to be changed.

A new dual-flush exposed cistern can be a relatively inexpensive solution, but the final price still depends on quality and workmanship. Built-in cisterns cost more because they include the frame, mechanism, flush plate, installation work, masonry or plasterboard work, and tiles. In a full bathroom renovation, choosing a built-in cistern is part of the overall budget.

A rimless basin can start at relatively affordable prices, around €100–200 for basic models, while better hanging or branded solutions can go quite a bit higher. The price is affected by whether it is floor or hanging, whether it has a soft-close seat, whether it is rimless, whether it has a special coating and whether it comes with a branded tank system.

Prices depend on area, store, quality, VAT, labor, access, whether the bathroom is being renovated or finished, and if any repairs are required. The cheapest solution is not always the most economical if it leaks water, has no spare parts or needs a double tap to clean.

If the cistern is leaking, if the mechanism is sticking, if the float will not stop, if the built-in flush plate is not working properly, or if you do not know how to adjust the system, you need a plumber. Work on a cistern looks simple, but the plastic parts break easily, especially in areas with persistent limescale.

A plumber is also needed when you want to change the mechanism in an old cistern and you are not sure about compatibility. In embedded systems, access is limited and the wrong move can create a bigger problem. If there is a leak in a built-in cistern, the check must be done immediately.

Also, if you experience drain problems after reducing the flow, such as frequent clogs, foul odors, or poor drainage, you shouldn't just adjust settings. Basin, siphon, drain slope and low flow compatibility should be checked.

The owner can do basic observation and cleaning. Adjustment and repair, when not completely clear, is a plumber's job.

The first mistake is lowering the level too much. If the basin needs a second tap, the save disappears.

The second mistake is buying a very cheap mechanism without reliable operation. If the seal is leaking or the button is sticking, it will waste water.

The third mistake is ignoring leakage. A leaking cistern can consume far more water than people realize.

The fourth mistake is basin and flow incompatibility. Not all old basins work well with too little water.

The fifth mistake is choosing rimless just for design. The rimless basin should have good hydraulic design, not just a modern description.

The sixth mistake is not to maintain the mechanism in areas with salts. Salts damage seals, valves and flow.

The seventh mistake is closing up a built-in cistern with poor access or with an unknown mechanism that has no spare parts. Future repairs then become difficult and expensive.

If you keep only one idea from this guide, make it this: do not chase the smallest possible amount of water. Chase the smallest amount that still flushes properly. A 3/6-liter dual-flush cistern really saves water when the reduced flush is used correctly, the full flush works with one press, the float stops at the right level, and the mechanism does not leak quietly. If a second press is often needed, or if the cistern trickles all day, the so-called "eco" solution has already failed in practice.

Water-saving cisterns and dual-flush mechanisms are among the most practical water-saving solutions in the bathroom. The choice between a small and a large flush allows only as much water to be used at a time, while modern toilet bowls, especially when properly designed, can do much better with smaller amounts.

The real savings, however, do not come only from buying a new mechanism. They come from correct float setting, the right water level, compatibility between bowl and cistern, zero leaks, and maintenance of seals and valves. A cistern that leaks or needs a second flush can consume more than a less "eco" system that simply works properly.

Rimless technology can help with hygiene and ease of cleaning, but it shouldn't just be chosen as a fad. It must be combined with good hydraulic design and proper flow. If a renovation is being carried out, it is worth choosing a reliable cistern-basin system with available spare parts and proper access.

For the owner, the practical instruction is simple: first check if the existing cistern is leaking, set the float correctly, use the double flow correctly and do not reduce the water so much that the flush is spoiled. A good saving is one that the user does not think about every time. It just works right, every day.